Ryzen

Ryzen (/ˈraɪzən/ RY-zən)[8] is a brand[9] of multi-core x86-64 microprocessors designed and marketed by AMD for desktop, mobile, server, and embedded platforms based on the Zen microarchitecture. It consists of central processing units (CPUs) marketed for mainstream, enthusiast, server, and workstation segments and accelerated processing units (APUs) marketed for mainstream and entry-level segments and embedded systems applications.

"Threadripper" redirects here. For the sewing tool, see Seam ripper.

Ryzen
General information
LaunchedMarch 2, 2017 (2017-03-02)[1]
Marketed byAMD
Designed byAMD
Common manufacturer(s)
Performance
Max. CPU clock rate3.0 GHz to 5.7 GHz
HyperTransport speeds800 MT/s to 2000 MT/s
Architecture and classification
Technology node14 nm to 5 nm
Microarchitecture
Instruction setMain processor:
x86-64
MMX(+), SSE1, SSE2, SSE3, SSSE3, SSE4a, SSE4.1, SSE4.2, AVX, AVX2, AVX-512 with Zen 4, FMA3, CVT16/F16C, ABM, BMI1, BMI2
AES, CLMUL, RDRAND, SHA, SME
AMD-V, AMD-Vi
AMD Platform Security Processor:
ARM Cortex-A5
Physical specifications
Transistors
  • 4.8 billion for Zen & Zen+ (per 14/12 nm 8-core "Zeppelin" die)[1]

    5.89 billion (1× CCD) or
    9.69 billion (2× CCD) for Zen 2
    (3.8 billion per 7 nm 8-core "CCD" & 2.09 billion for the 12 nm "I/O die")[2]

    6.24 billion (1x CCD) or
    10.39 billion (2x CCD) for Zen 3
    (4.15 billion per 7 nm 8-core "CCD" & 2.09 billion for the same 12 nm "I/O die")[3]
Cores
  • Mainstream: Up to 16 cores[4][5]
    HEDT: Up to 64 cores[6]
Socket(s)
History
Predecessor(s)FX
Ryzen 3 PRO 2100GE
Ryzen 3 PRO 2100GE[7] found in some OEM markets in limited quantities.

A majority of AMD's consumer Ryzen products use the Socket AM4 platform. In August 2017, AMD launched their Ryzen Threadripper line aimed at the enthusiast workstation market. AMD Ryzen Threadripper uses the larger TR4, sTRX4, and sWRX8 sockets, which support additional memory channels and PCI Express lanes. AMD has moved to the new Socket AM5 platform for consumer desktop Ryzen with the release of Zen 4 products in late 2022.

History
AMD Ryzen 7 3700X top and pins

AMD announced a new series of processors on December 13, 2016, named "Ryzen", and delivered them in Q1 2017,[9] the first of several generations. The 1000 series featured up to eight cores and 16 threads, with a +52% instructions per cycle (IPC) increase over their prior CPU products.[10]

The second generation of Ryzen processors, the Ryzen 2000 series, released in April 2018, featured the Zen+ microarchitecture. The aggregate performance increased +10% (of which approximately +3% was IPC and +6% clock frequency[11][12]). Most importantly, Zen+ fixed the cache and memory latencies that had been major weak points.[13]

The third generation of Ryzen processors launched on July 7, 2019, based on AMD's Zen 2 architecture, featuring significant design improvements with a +15% average IPC boost, a doubling of floating point capability to a full 256-bit-wide execution data path much like Intel's Haswell released in 2014,[14] a shift to an MCM style "chiplet" based package design, and a further shrink to Taiwan Semiconductor Manufacturing Company's (TSMC) 7 nm fabrication process.

On June 16, 2020, AMD announced new Ryzen 3000 series XT processors with increased boost clocks and other performance enhancements compared to non-XT processors.[15]

On October 8, 2020, AMD announced the Zen 3 architecture for their Ryzen 5000 series processors, featuring a +19% IPC improvement over Zen 2, while being built on the same 7 nm TSMC node with out-of-the-box operating boost frequencies exceeding 5 GHz for the first time since AMD's Piledriver.[16][17] This was followed by an unusually short stop-gap release of Ryzen 6000 mobile-only series processors on January 4, 2022, using the modestly changed Zen 3+ core on a 6nm process by TSMC, with claims up to +15% performance uplift gains (stated to be from frequency rather than IPC).[18]

Following this, the Ryzen 7000 series released on September 27, 2022, for desktops, featuring the new Zen 4 core with a +13% uplift in IPC and +15% increase in frequency for a claimed nearly +30% in single thread performance.[19] The Ryzen 7000 series features a brand new AM5 socket that only supports DDR5 SDRAM, unlike AMD's previous DDR3 sockets like AM2/+ and AM3/+ that offered DDR2 and DDR3 options and Intel's Alder Lake platforms that offer both DDR4 and DDR5 compatibility.

Microarchitecture

Ryzen is the consumer-level implementation of the newer Zen microarchitecture, a complete redesign that marked the return of AMD to the high-end CPU market, offering a product stack able to compete with Intel at every level.[20][21] Having more processing cores, Ryzen processors offer greater multi-threaded performance at the same price point relative to Intel's Core processors.[22] The Zen architecture delivers more than +52% improvement in instructions per cycle (clock) over the prior-generation Bulldozer AMD core, without raising power use.[10] The changes to instruction set also makes it binary-compatible with Intel's Broadwell, smoothing the transition for users.[23]

Threadripper series

Threadripper, which is geared for high-end desktops (HEDT), was not developed as part of a business plan or a specific roadmap; instead, a small enthusiast team inside AMD saw an opportunity that something could be developed between the Ryzen and EPYC CPU roadmaps that would give AMD the lead in desktop CPU performance. After some progress was made in their spare time, the project was greenlit and put in an official roadmap by 2016.[24]

Features

APUs

APU features table

Product lineup

Desktop
  • Socket AM4 for Ryzen and Socket TR4 for Ryzen Threadripper.[25][26]
  • Based on first generation Zen. Ryzen CPUs based on Summit Ridge architecture. Threadripper based on Whitehaven architecture.
  • 4.8 billion transistors per 192 mm2[27] 8-core "Zeppelin" die[1] with one die being used for Ryzen and two for Ryzen Threadripper.
  • Stepping: B1[28]
  • Memory support:
    • Ryzen dual-channel: DDR4–2666 ×2 single rank, DDR4–2400 ×2 dual rank, DDR4–2133 ×4 single rank, or DDR4–1866 ×4 dual rank.[25][29]
    • Ryzen Threadripper quad-channel: DDR4–2666 ×4 single rank, DDR4–2400 ×4 dual rank, DDR4–2133 ×8 single rank, or DDR4–1866 ×8 dual rank.
  • Instructions sets: x87, MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, AES, CLMUL, AVX, AVX2, FMA3, CVT16/F16C, ABM, BMI1, BMI2, SHA.[23]
  • All Ryzen-branded CPUs (except Pro variants) feature unlocked multipliers.
  • AMD's SenseMI Technology monitors the processor continuously and uses Infinity Control Fabric to offer the following features:[25][30][31]
    • Pure Power reduces the entire ramp of processor voltage and clock speed, for light loads.
    • Precision Boost increases the processor voltage and clock speed by 100–200 MHz if three or more cores are active (five or more, in the case of Threadripper, and by 300 MHz); and significantly further when less than three are active (less than five, in the case of Threadripper).[32]
    • XFR (eXtended Frequency Range) aims to maintain the average clock speed closer to the maximum Precision Boost, when sufficient cooling is available.[33]
    • Neural Net Prediction and Smart Prefetch use perceptron based neural branch prediction inside the processor to optimize instruction workflow and cache management.
  • Ryzen launched in conjunction with a line of stock coolers for Socket AM4: the Wraith Stealth, Wraith Spire and Wraith Max. This line succeeds the original AMD Wraith cooler, which was released in mid-2016.[34] The Wraith Stealth is a bundled low-profile unit meant for the lower-end CPUs with a rating for a TDP of 65 W, whereas the Wraith Spire is the bundled mainstream cooler with a TDP rating of 95 W, along with optional RGB lighting on certain models. The Wraith Max is a larger cooler incorporating heatpipes, rated at 140 W TDP.
  • In December 2019, AMD started producing first generation Ryzen products built using the second generation Zen+ architecture.[35] An example is the Ryzen 5 1600, with new batches having an "AF" identifier instead of its usual "AE", essentially being an underbinned Ryzen 5 2600 with the same specifications as the original Ryzen 5 1600.
Overview of desktop Ryzen 1000 series models
Model line Codename Architecture Core count Integrated graphics
Ryzen Threadripper 1000 Whitehaven Zen (1st gen) 8–16 none
Ryzen 1000 / 1000X Summit Ridge 4–8

Desktop

The first Ryzen 2000 CPUs, based on the 12 nm Zen+ microarchitecture, were announced for preorder on April 13, 2018[36] and launched six days later. Zen+ based Ryzen CPUs are based on Pinnacle Ridge architecture,[37] while Threadripper CPUs are based on the Colfax microarchitecture. The first of the 2000 series of Ryzen Threadripper products, introducing Precision Boost Overdrive technology,[33] followed in August. The Ryzen 7 2700X was bundled with the new Wraith Prism cooler.

In January 2018, AMD announced the first two Ryzen desktop APUs with integrated Radeon Vega graphics under the Raven Ridge codename. These were based on first generation Zen architecture. The Ryzen 3 2200G and the Ryzen 5 2400G were released in February.[38]

Overview of desktop Ryzen 2000 series models
Model line Codename Architecture Core count Integrated graphics
Ryzen Threadripper 2000 Colfax Zen+ 12–32 none
Ryzen 2000 / 2000X Pinnacle Ridge 4–8
Ryzen 2000G Raven Ridge Zen (1st gen) 4 Radeon (Vega), up to 11 CU

Mobile

In May 2017, AMD demonstrated a Ryzen mobile APU with four Zen CPU cores and Radeon Vega-based GPU.[39] The first Ryzen mobile APUs, codenamed Raven Ridge, were officially released in October 2017.[40]

  • 4.95 billion[41] transistors on a 210 mm2 die,[41] based on a modified 14 nm Zeppelin die where four of the cores are replaced by an integrated fifth-generation GCN-based GPU.
  • Precision Boost 2[37]
  • 16 external PCIe 3.0 lanes (four each to chipset and M.2 socket; eight to a PCIe slot). 16 internal PCIe 3.0 lanes for the integrated GPU and on-board input/output (I/O). In 2019, AMD released some new dual core Zen mobile parts branded as 300 or 3000, codenamed Dali.
Overview of laptop Ryzen 2000 series models
Model line Codename Architecture Core count Integrated graphics
Ryzen 2000 Raven Ridge Zen (1st gen) 2–4 Radeon (Vega), up to 11 CU
Great Horned Owl
See also: List of AMD Ryzen processors § Great Horned Owl (V1000 series, Zen based)

In February 2018, AMD announced the V1000 series of embedded Zen+ Vega APUs, based on the Great Horned Owl architecture, with four SKUs.[42]

Banded Kestrel
See also: List of AMD Ryzen processors § Banded Kestrel (R1000 series, Zen based)

In April 2019, AMD announced another line of embedded Zen+Vega APUs, namely the Ryzen Embedded R1000 series with two SKUs.[43]

Desktop

On May 27, 2019, at Computex in Taipei, AMD launched its third generation Ryzen processors which use AMD's Zen 2 architecture. For this generation's microarchitectures, Ryzen uses Matisse, while Threadripper uses Castle Peak. The chiplet design separates the CPU cores, fabricated on TSMC's 7FF process, and the I/O, fabricated on GlobalFoundries' 12LP process, and connects them via Infinity Fabric.[44] The Ryzen 3000 series uses the AM4 socket similar to earlier models and is the first CPU to offer PCI Express 4.0 (PCIe) connectivity.[45] The new architecture offers a 15% instruction-per-clock (IPC) uplift and a reduction in energy usage. Other improvements include a doubling of the L3 cache size, a re-optimized L1 instruction cache, a larger micro-operations cache, double the floating point performance, improved branch prediction, and better instruction pre-fetching.[44] The 6-, 8- and 12-core CPUs became generally available on July 7, 2019, and 24-core processors were launched in November.[46]

The Ryzen Threadripper 3990X, part of Castle Peak generation of CPUs, has currently the world's largest number of both cores and threads available in consumer-oriented CPUs - 64 and 128, respectively. The competing Intel Core i9-10980XE processor has only 18 cores and 36 threads. Another competitor, the workstation-oriented Intel Xeon W-3275 and W-3275M, has 28 cores, 56 threads, and cost more when launched.

The 4-, 6- and 8-core processors have one core chiplet. The 12- and 16-core processors have two core chiplets. In all cases the I/O die is the same.[44]

The Threadripper 24- and 32-core processors have four core chiplets. The 64-core processor has eight core chiplets. All Threadripper processors use the same I/O die.

Both mobile and desktop APUs are based on the Picasso microarchitecture, a 12 nm refresh of Raven Ridge, offering a modest (6%) increase in clock speeds (up to an additional 300 MHz maximum boost), Precision Boost 2, an up to 3% increase in IPC from the move to the Zen+ core with its reduced cache and memory latencies, and newly added solder thermal interface material for the desktop parts.[47] Fabricated at GlobalFoundries, This gives the Ryzen 12nm (Zen+ refresh) from the "original" 14nm Zen cores initially released in 2017 an aggregate 10% performance uplift going from 14nm to 12nm.

Overview of desktop Ryzen 3000 series models
Model line Codename Architecture Core count Integrated graphics
Ryzen Threadripper PRO 3000 Castle Peak Zen 2 12–64 none
Ryzen Threadripper 3000 24–64
Ryzen 3000 / 3000X Matisse 4–16
Ryzen 3000G Picasso Zen+ 4 Radeon (Vega), up to 11 CU

Mobile

In 2019, AMD first released the Ryzen 3000 APUs, consisting only of quad core parts. Then in January 2020, they announced value dual core mobile parts, codenamed Dalí, including the Ryzen 3 3250U.

Overview of laptop Ryzen 3000 series models
Model line Codename Architecture Core count Integrated graphics
Ryzen 3000 Picasso Zen+ 2–4 Radeon (Vega), up to 11 CU
Ryzen 3 3250U,
Ryzen 3 3200U		 Dali Zen (1st gen) 2 Radeon (Vega), 3 CU

Desktop

The Ryzen 4000 APUs are based on Renoir, a refresh of the Zen 2 Matisse CPU cores, coupled with Radeon Vega GPU cores. They were released only to OEM manufacturers in mid-2020. Unlike Matisse, Renoir does not support PCIe 4.0.[48]

Ryzen Pro 4x50G APUs are the same as 4x00G APUs, except they are bundled a Wraith Stealth cooler and are not OEM-only.[49] It is possible this is a listing mistake, since 4x50G CPUs are unavailable on retail (as of Oct. 2020) and PRO SKUs are usually the OEM only parts.

In April 2022, AMD released the Ryzen 5 4600G to retail, and launched the Ryzen 4000 series of CPUs without integrated graphics, for budget-oriented users.[50] Unlike the Ryzen 3000 series CPUs which are based on "Matisse" cores, these new Ryzen 4000 series desktop CPUs are based on "Renoir" cores and are essentially APUs with the integrated graphics disabled.

Overview of desktop Ryzen 4000 series models
Model line Codename Architecture Core count Integrated graphics
Ryzen 4000 Renoir Zen 2 6–8 none
Ryzen 4000G 4–8 Radeon (Vega), up to 8 CU

Mobile

Zen 2 APUs, based on the 7 nm Renoir microarchitecture, commercialized as Ryzen 4000.[51][52][53]

Overview of laptop Ryzen 4000 series models
Model line Codename Architecture Core count Integrated graphics
Ryzen 4000 Renoir Zen 2 4–8 Radeon (Vega), up to 8 CU
Grey Hawk
See also: List of AMD Ryzen processors § Grey Hawk (V2000 series, Zen 2 based)

In November 2020, AMD announced the V2000 series of embedded Zen 2 Vega APUs.

Desktop

The desktop Ryzen 5000 series, based on the Zen 3 microarchitecture, was announced on October 8, 2020.[54][55] They use the same 7 nm manufacturing process, which has matured slightly.[56] Mainstream Ryzen 5000 CPUs are codenamed Vermeer. Enthusiast/workstation Threadripper 5000 CPUs are codenamed Chagall,[57] initially named Ryzen Threadripper 4000 under the codename Genesis.[58]

In contrast to their CPU counterparts, the APUs consist of single dies with integrated graphics and smaller caches. The APUs, codenamed Cezanne, forgo PCIe 4.0 support to keep power consumption low.[59]

Overview of desktop Ryzen 5000 series models
Model line Codename Architecture Core count Integrated graphics
Ryzen Threadripper PRO 5000 Chagall Zen 3 12–64 none
Ryzen 5000 / 5000X / 5000X3D Vermeer 6–16
Ryzen 7 5700,
Ryzen 5 5500		 Cezanne 6–8
Ryzen 5000G 4–8 Radeon (Vega), up to 8 CU

Mobile

The 5000 series includes models based on the Zen 2 microarchitecture (codename Lucienne) and Zen 3 microarchitecture. The codenames of the Zen 3-based mobile APUs are Cezanne for the 2021 models and Barceló for the 2022 models. HX models are unlocked, allowing them to be overclocked if the host device manufacturer has exposed that functionality. SMT is now standard across the lineup unlike the 4000-series Ryzen Mobile.

Overview of laptop Ryzen 5000 series models
Model line Codename Architecture Core count Integrated graphics
Ryzen 5000 Cezanne Zen 3 2-8 Radeon (Vega), up to 8 CU
Ryzen 7 5700U,
Ryzen 5 5500U,
Ryzen 3 5300U		 Lucienne Zen 2 4-8

Mobile

At CES 2022, AMD announced the Ryzen 6000 mobile series. It is based on the Zen 3+ architecture, which is Zen 3 on 6nm with efficiency improvements, and is codenamed Rembrandt. Other noteworthy upgrades are RDNA2 based graphics, PCIe 4.0 and DDR5/LPDDR5 support. Ryzen PRO versions of the these processors were announced on April 19, 2022[60] and use a 6x50 naming scheme.

Overview of laptop Ryzen 6000 series models
Model line Codename Architecture Core count Integrated graphics
Ryzen 6000 Rembrandt Zen 3+ 6–8 Radeon (RDNA 2), up to 12 CU

Desktop
AMD Ryzen 9 7900X processor

In May 2022, AMD revealed its roadmap showing the Ryzen 7000 series of processors for release later that year, to be based on the Zen 4 architecture in 5 nm (Codename Raphael).[61][62] Included are DDR5 and PCIe 5.0 support as well as the change to the new AM5 socket. On May 23, 2022, at AMD's Computex keynote, AMD officially announced the Ryzen 7000 to be released in Fall 2022, showing a 16-core CPU reaching boost speeds of 5.5 GHz and claiming a 15% increase in single-thread performance.[63] The initial four models of the Ryzen 7000 series, ranging from Ryzen 5 to Ryzen 9, were launched on September 27, 2022.[64]

The L2 cache per core is doubled to 1 MB from Zen 3. The I/O die has moved from a 12 nm process to 6 nm and incorporates an integrated RDNA 2 GPU on all Ryzen 7000 models, as well as DDR5 and PCIe 5.0 support.[65][66] DDR4 RAM is not supported on Ryzen 7000. According to Gamers Nexus, AMD said that the RDNA GPU was intended for diagnostic and office purposes without using a discrete GPU and not for gaming.[67] The operating power of AM5 is increased to 170 W from AM4's 105 W, with the absolute maximum power draw or "Power Package Tracking" (PPT) being 230 W.[68]

Overview of desktop Ryzen 7000 series models
Model line Codename Architecture Core count Integrated graphics
Ryzen Threadripper PRO 7000 Storm Peak Zen 4 12–96 none
Ryzen Threadripper 7000 24–64
Ryzen 7000 / 7000X / 7000X3D Raphael 6–16 Radeon (RDNA 2), 2 CU

Mobile

The Ryzen 7000 mobile series initially launched in September 2022 with the Ryzen 7020 Mendocino line of low-end Zen 2 mobile processors.[69]

In early 2023, the rest of the Ryzen 7000 mobile lineup was released, starting with Ryzen 7030, Ryzen 7035, and later Ryzen 7045 and Ryzen 7040 series processors.

The Ryzen 7020 series targets the "everyday computing" segment.[70] It is a new design based on Zen 2 architecture and RDNA 2 integrated graphics.

The Ryzen 7030 series is a refresh of Ryzen 5000 series processors codenamed "Barcelo",[71] targeting the "mainstream thin-and-light" segment.[70]

The Ryzen 7035 series is a refresh of Ryzen 6000 series processors codenamed "Rembrandt",[71] targeting "premium thin-and-light" laptops.[70]

The Ryzen 7040 series is a new design based on Zen 4, targeting "elite ultrathin" segment.[70] It integrates a built-in AI accelerator (branded as "Ryzen AI") for the first time in an AMD processor,[72] and features RDNA 3 integrated graphics with up to 12 compute units.

The Ryzen 7045 series is the top of the range, based on Zen 4. It targets "extreme gaming and creator" laptops, i.e. desktop replacement class laptops,[70] with models providing up to 16 cores. It uses a chiplet package built using a separate CCD and I/OD, the same as those used in Raphael desktop processors.[73]

Altogether, there are four different CPU architectures, and three different GPU architectures used across the various models in the 7000 series lineup.[74]

With the launch of the mobile Ryzen 7000 series, a new CPU model naming system was also introduced, which is used with Ryzen and Athlon mobile processors launching from this point onwards, as follows:[75]

Ryzen/Athlon xabc:

  • x – timeline of creation (7 for 2022, 8 for 2023, etc)
  • a – performance segment (1 for low end, 7 for high-end, 9 for enthusiast, etc)
  • b – Microarchitecture the processor is based on (1 for Zen / Zen+, 3 for Zen 3, 4 for Zen 4, etc)
  • c – feature / minor performance segment (0 for lower segment, 5 for higher segment)

The new naming system has drawn criticism for being overly complex and confusing to consumers.[76][77] Desktop processors will continue to use the old naming system.[78]

Overview of laptop Ryzen 7000 series models
Model line Codename Architecture Core count Integrated graphics
Ryzen 7045 Dragon Range Zen 4 6–16 Radeon (RDNA 2), 2 CU
Ryzen 7040 Phoenix 6–8 Radeon (RDNA 3), up to 12 CU
Ryzen 7035 Rembrandt-R Zen 3+ 4–8 Radeon (RDNA 2), up to 12 CU
Ryzen 7030 Barcelo-R Zen 3 Radeon (Vega), up to 8 CU
Ryzen 7020 Mendocino Zen 2 4 Radeon (RDNA 2), 2 CU


Initial reception

The first Ryzen 7 (1700, 1700X, and 1800X) processors debuted in early March 2017 and were generally well received by hardware reviewers.[79][80][81] Ryzen was the first brand new architecture from AMD in five years, and without very much initial fine-tuning or optimization, it ran generally well for reviewers.[82] Initial Ryzen chips ran well with software and games already on the market, performing exceptionally well in workstation scenarios, and well in most gaming scenarios. Compared to Piledriver-powered FX chips, Zen-powered Ryzen chips ran cooler, much faster, and used less power. IPC uplift was eventually gauged to be 52% higher than Excavator, which was two full generations ahead of the architecture still being used in AMD's FX-series desktop predecessors like the FX-8350 and FX-8370.[1] Though Zen fell short of Intel's Kaby Lake in terms of IPC, and therefore single-threaded throughput, it compensated by offering more cores to applications that can use them. Power consumption and heat emission were found to be competitive with Intel, and the included Wraith coolers were generally competitive with higher-priced aftermarket units.

Ryzen 1800X's multi-threaded performance, in some cases while using Blender or other open-source software, was around four times the performance of the FX-8370, or nearly double that of the i7 7700K.[83] One reviewer found that Ryzen chips would usually outperform competing Intel i7 processors for a fraction of the price when all eight cores are used.[83]

However, one complaint among a subset of reviewers was that Ryzen processors lagged behind their Intel counterparts when running older games, or some newer games at mainstream resolutions such as 720p or 1080p.[84] AMD acknowledged the gaming performance deficit at low resolutions during a Reddit "Ask Me Anything" thread, where it explained that updates and patches were being developed.[85] Subsequent updates to Ashes of the Singularity: Escalation and Rise of the Tomb Raider increased frame rates by 17–31% on Ryzen systems.[86][87] In April 2017, developer id Software announced that, in the future, its games would exploit the greater parallelism available on Ryzen CPUs.[88]

It has been suggested that low threaded applications often result in Ryzen processors being underused, yielding lower than expected benchmark scores, because Zen relies on its core count to make up for its lower IPC rating than that of Kaby Lake.[89][90][91] However, AMD and others have argued thread scheduling is not the fundamental issue to Windows 10 performance.[92][93] Early AM4 motherboards were also hindered by BIOS bugs and poor DDR4 memory support.

Operating system support

Windows

AMD verified that computers with Ryzen CPUs can boot Windows 7 and Windows 8 both 64- and 32-bit but on newer hardware, including AMD Ryzen and Intel Kaby Lake and later, Microsoft only officially supports the use of Windows 10. Windows Update blocks updates from being installed on newer systems running older versions of Windows, though that restriction can be circumvented with an unofficial patch.[94] Windows 11 is only officially supported on Ryzen APUs and CPUs using Zen+ architecture or newer; systems running Zen architecture-based CPUs or APUs are not entitled to receive updates.[95][96][97]

Although AMD initially announced that Ryzen chipset drivers would not be provided for Windows 7,[98] its chipset driver packages do in fact list and include them.[99]

Linux

Full support for Ryzen processors' performance features in Linux requires kernel version 4.10 or newer.[100]

Known issues

Spectre

Like nearly all modern high performance microprocessors, Ryzen was susceptible to the "Spectre" vulnerabilities. The vulnerabilities can be mitigated without hardware changes via microcode updates and operating system workarounds, but the mitigations incur a performance penalty.[101] AMD Ryzen and Epyc suffer up to 20% penalty from the mitigations,[102] depending on workload, comparing favorably with a penalty of in some benchmarks up to 30% for Intel Core and Xeon processors,[103][104] in part as a result of the AMD processors not requiring mitigation against the related Meltdown vulnerability.[105]

Launched in 2019, Zen 2 includes hardware mitigations against the Spectre V4 speculative store bypass vulnerability.[44][106]

Segmentation fault

Some early shipments of Ryzen 1000 series processors produced segmentation faults on some workloads on Linux, especially while compiling code with GNU Compiler Collection (GCC).[107] AMD offered to replace the affected processors with newer ones that are unaffected by the problem.[108]

Alleged issues by CTS Labs

In early 2018, Israeli computer security consultancy firm CTS Labs stated that they had discovered several major flaws in the Ryzen components ecosystem,[109] publicly disclosing them after giving AMD 24 hours to respond and raising concerns and questions regarding their legitimacy,[110][111] though they were later confirmed by two separate security firms.[112] AMD has since stated that while the flaws are real and will be fixed via microcode updates, their severity was overstated as physical access to the hardware is required to exploit the flaws.[113]

See also

References
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