Ryzen

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AMD Ryzen
AMD ryzen stylized.svg
ProducedFrom February 2017 to present
Marketed byAMD
Designed byAMD
Common manufacturer(s)
Max. CPU clock rate3.0 GHz to 4.7 GHz
Min. feature size14 nm to 7 nm
Instruction setAMD64/x86-64, MMX(+), SSE1, SSE2, SSE3, SSSE3, SSE4a, SSE4.1, SSE4.2, AES, CLMUL, AVX, AVX2, FMA3, CVT16/F16C, ABM, BMI1, BMI2, SHA
MicroarchitectureZen
Zen+
Zen 2
CoresUp to 32 cores/64 threads
Transistors4.8 billion (per 8 cores)[1]
Socket(s)
PredecessorFX

Ryzen (/ˈrzən/ RY-zən)[2] is a brand[3] of x64 and x86 microprocessors designed and marketed by AMD (Advanced Micro Devices) for desktop, mobile and embedded platform based on Zen and Zen+ microarchitectures. It consists of central processing units marketed for mainstream, enthusiast and workstation segments and accelerated processing units (APUs) which is marketed for mainstream and entry-level segments and embedded applications.

Ryzen was introduced in February 2017 with the first products officially announced during AMD's New Horizon summit on December 13, 2016, feature the Zen microarchitecture.[4] The second generation of Ryzen CPUs feature the Zen+ microarchitecture, built with 12 nm process technology and were released on April 19, 2018.[5]

Product lineup[edit]

Zen microarchitecture[edit]

History[edit]

In the five years before the release of Ryzen, AMD's direct competitor in the x86 and x64 consumer-level CPU marketspace, Intel, had continued to grow its market share with the tick-tock cycle of their Intel Core series of chips.[6] Since the release of Bulldozer microarchitecture in 2011, AMD CPUs had fallen behind Intel Core architecture in both single- and multi-core performance,[7] which resulted in poor sales. While AMD had completed a die shrink and several revisions of the Bulldozer architecture, performance and efficiency still fall behind Intel's competing products.[citation needed] Ryzen is the first consumer-level implementation of the newer Zen microarchitecture.[8][9] The release of Ryzen marked a return for AMD in the high-end desktop CPU market, offering a product able to compete with Intel's high-end desktop variants of Core i7 series of processors. High performance Ryzen processors offered greater multi-threaded performance at the same price point relative to Intel's Core processors.[10] AMD's high-performance x86-core Zen architecture delivers >52% improvement in instructions-per-clock cycle over the previous-generation AMD core, without increasing power consumption.[11] Since the release of Ryzen, AMD's CPU market share has increased.[6]

CPUs: Summit Ridge / Whitehaven[edit]

  • Socket AM4 or Socket TR4 for Ryzen Threadripper.[12][13]
  • Memory support DDR4-2666 ×2 Single Rank, DDR4-2400 ×2 Dual Rank, DDR4-2133 ×4 Single Rank, or DDR4-1866 ×4 Dual Rank. (With compatible DIMM quantities doubled on Threadripper due to its dual IMCs, and thus quad-channel memory support).[12][14]
  • Instructions Sets: x87, MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, AES, CLMUL, AVX, AVX2, FMA3, CVT16/F16C, ABM, BMI1, BMI2, SHA.[15]
  • Transistors: 4.8 billion per 8-core "Zeppelin" die[1]
  • Die size: 192 mm2[16]
  • Stepping: B1[17]
  • Ryzen CPUs feature unlocked multipliers across the board for overclocking. All Ryzen products also support temperature-based auto-overclocking, dubbed "XFR" (eXtended Frequency Range); with "X"-branded Ryzen products having twice the potential amount of XFR boost as non-"X" models (100 MHz vs 50 MHz).[18] This is despite the fact that AMD doesn't list the latter as supporting XFR at all. Also of note that these values are doubled on Threadripper; with "X" models having 200 MHz, rather than the usual 100 MHz of XFR boost.[19]
  • AMD officially revealed their codename "Summit Ridge" Ryzen CPUs on February 22, 2017.[20] "Whitehaven" is planned to be a large, LGA "S3" socket, HEDT (high-end desktop) variant with 16 cores and 32 threads.[21]
  • Ryzen is launching in conjunction with a line of stock coolers for Socket AM4, the "Wraith Spire", "Wraith Stealth" and "Wraith Max". This line succeeds the original "Wraith" cooler, which was positively received when released in mid-2016.[22] The "Wraith Stealth" and "Wraith Spire" are included with certain Ryzen CPUs; the "Stealth" is a low-profile unit meant for the lower-end CPUs and is rated for a TDP of 65 W, whereas the "Spire" is the mainstream cooler with a TDP rating of 95 W and modest headroom for overclocking, along with optional RGB lighting on certain models. The "Wraith Max" is a larger, aftermarket unit intended to handle more intensive overclocks than the "Spire".
  • AMD's SenseMI Technology, which uses AMD Infinity Control Fabric to offer the following features:[12][23][24]
    • AMD Pure Power reduces the entire ramp of processor voltage and clock speed, for light loads.
    • AMD 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).[25][26]
    • AMD XFR ("eXtended Frequency Range") aims to maintain the average clock speed closer to the maximum Precision Boost, when sufficient cooling is available.[27]
    • Neural Net Prediction and Smart Prefetch use perceptron based neural branch prediction inside the processor to optimize instruction workflow and cache management.
Model Release Date
& Price
Cores
(threads)
Clock rate (GHz) Cache[a] Socket PCIe lanes[b] Memory
support
TDP
Base Precision Boost
1–2
(≥3)
XFR L1 L2 L3
Entry-level
Ryzen 3 1200[c][32][33][34] July 27, 2017
US $109
4 (4) 3.1 3.4
(?)
3.45[35] 384 KB [36][37][38][39][40][41][42] 512 KB per core [43][44][45] 8 MB AM4 24[46] DDR4-2666
dual-channel
65 W [47]
Ryzen 3 1300X[c][32][33] July 27, 2017
US $129
3.5 3.7
(?)
3.9[48]
Mainstream
Ryzen 5 1400 April 11, 2017
US $169
4 (8) 3.2 3.4
(?)
3.45 384 KB [36][37][38][39][40][41][42] 512 KB per core [43][44][45] 8 MB AM4 24[46] DDR4-2666
dual-channel
65 W [47]
Ryzen 5 1500X[c] April 11, 2017
US $189
3.5 3.7
(3.6)
3.9 16 MB
Ryzen 5 1600[c] April 11, 2017
US $219
6 (12) 3.2 3.6
(3.4)
3.7 576 KB [49][50][51]
Ryzen 5 1600X April 11, 2017
US $249
3.6 4.0
(3.7)
4.1 95 W
Performance
Ryzen 7 1700[c] March 2, 2017
US $329
8 (16) 3.0 3.7
(3.2)
3.75 768 KB [52][53][53][54] 512 KB per core [43][44][45] 16 MB AM4 24[46] DDR4-2666
dual-channel
65 W
Ryzen 7 1700X[c] Mar 2, 2017
US $399
3.4 3.8[55]
(3.5)
3.9 95 W
Ryzen 7 1800X March 2, 2017
US $499
3.6 4.0
(3.7)
4.1
High-end desktop (HEDT)
Ryzen Threadripper 1900X[43][56][57] August 31, 2017
US $549
8 (16) 3.8 4.0
(3.9)[58][59]
4.2 768 KB 512 KB per core [44][45] 16 MB TR4[60] 64[61] DDR4-2666
quad-channel[60][62]
180 W
Ryzen Threadripper 1920X[63][43] August 10, 2017
US $799
12 (24) 3.5 4.05[64]
(3.7)[65]
1152 KB [45] 32 MB [44][45]
Ryzen Threadripper 1950X[63][43] August 10, 2017
US $999
16 (32) 3.4 4.0
(3.7)
1536 KB [44]
  1. ^ AMD defines 1 kilobyte (KB) as 1024 bytes, and 1 megabyte (MB) as 1024 kilobytes.[28]
  2. ^ PCIe lane count includes 4 lanes used for connectivity to the chipset.[29]
  3. ^ a b c d e f Model also available as Pro variant for OEMs, which may offer additional features not listed in this table. Pro models were released by AMD on June 29, 2017.[30][31]


APUs: Raven Ridge[edit]

AMD's CEO, Lisa Su, confirmed during a March 2017 Reddit AMA on /r/AMD that Zen-based APUs would also be branded Ryzen.[66] Traditionally, AMD's APUs were branded separately from their CPUs. The branding was later clarified as Ryzen Mobile, and AMD stated that the products would have higher CPU and GPU performance and lower power than the previous generation of APUs.[67]

In May 2017, AMD demonstrated a Ryzen Mobile APU with four Zen CPU cores and Vega-based GPU,[68] the first Ryzen Mobile APUs were officially released in October 2017.[69] It is the first chip by AMD that features the Video Core Next ASIC.

Mobile[edit]
Model Release
date
CPU GPU Memory support TDP Part number
Cores
(threads)
Clock rate (GHz) Cache[a] Model Config[b] Clock Processing power (GFLOPS)[c]
Base Boost L2 L3
Athlon Pro 200U[71] 2019 2 (4) 2.3 3.2 1 MB 4 MB Vega 3 192:12:4
3 CU [72]
1000 MHz 384 DDR4-2400 dual-channel 12–25 W (configurable) YM200UC4T2OFB
Ryzen 3 2200U[73] January 8, 2018 2.5 3.4 1100 MHz 422.4 YM2200C4T2OFB
Ryzen 3 2300U[74] 4 (4) 2.0 2 MB Vega 6 384:24:8
6 CU [75]
844.8 YM2300C4T4MFB
Ryzen 3 Pro 2300U[76] May 15, 2018 [77] YM230BC4T4MFB
Ryzen 5 2500U[78] October 26, 2017[78] 4 (8) 3.6 Vega 8 512:32:16
8 CU [79]
1126.4 YM2500C4T4MFB
Ryzen 5 Pro 2500U[80] May 15, 2018 [77] YM250BC4T4MFB
Ryzen 5 2600H[81] September 10, 2018[82] 3.2 DDR4-3200 dual-channel 35–54 W (configurable) YM2600C3T4MFB
Ryzen 7 2700U[83] October 26, 2017[83] 2.2 3.8 Vega 10 640:40:16
10 CU [84]
1300 MHz 1664 DDR4-2400 dual-channel 12–25 W (configurable) YM2700C4T4MFB
Ryzen 7 Pro 2700U[85] May 15, 2018 [77] YM270BC4T4MFB
Ryzen 7 2800H[81] September 10, 2018[82] 3.3 Vega 11 704:44:16
11 CU
1830.4 DDR4-3200 dual-channel 35–54 W (configurable) YM2800C3T4MFB
  1. ^ AMD defines 1 kilobyte (KB) as 1024 bytes, and 1 megabyte (MB) as 1024 kilobytes.[28]
  2. ^ Unified Shaders : Texture Mapping Units : Render Output Units and Compute Units (CU)
  3. ^ Single precision performance is calculated from the base (or boost) core clock speed based on a FMA operation.
Desktop[edit]

In January 2018, AMD also announced the first two desktop processors with an integrated Vega GPU under the Raven Ridge codename, which were released in February.[86]

Model Release Date
& Price
CPU GPU Memory
support
TDP
Cores
(threads)
Clock rate (GHz) Cache[a] Model Config[b] Clock Processing power (GFLOPS)[c]
Base Boost L2 L3
Athlon 200GE[87][88] September 6, 2018
US $55
2 (4) 3.2 N/A 1 MB 4 MB Vega 3 192:12:4
3 CU
1000 MHz 384 DDR4-2666
dual-channel
35 W
Athlon Pro 200GE[89][88] September 6, 2018
OEM
Athlon 220GE[90] December 21, 2018
US $65
3.4
Athlon 240GE[90] December 21, 2018
US $75
3.5
Ryzen 3 2200GE[91][92] April 19, 2018
OEM
4 (4) 3.2 3.6 2 MB 4 MB RX Vega 8 512:32:16
8 CU
1100 MHz 1126 DDR4-2933
dual-channel
Ryzen 3 Pro 2200GE[93] May 10, 2018
OEM
Ryzen 3 2200G[94][95] February 12, 2018[96]
US $99
3.5 3.7 45–65 W (configurable)
Ryzen 3 Pro 2200G[97] May 10, 2018
OEM
Ryzen 5 2400GE[98][92] April 19, 2018
OEM
4 (8) 3.2 3.8 RX Vega 11 704:44:16
11 CU[99]
1250 MHz 1760 35 W
Ryzen 5 Pro 2400GE[100] May 10, 2018
OEM
Ryzen 5 2400G[101][95] February 12, 2018[96][102]
US $169
3.6 3.9 45–65 W (configurable)
Ryzen 5 Pro 2400G[103] May 10, 2018
OEM
  1. ^ AMD defines 1 kilobyte (KB) as 1024 bytes, and 1 megabyte (MB) as 1024 kilobytes.[28]
  2. ^ Unified Shaders : Texture Mapping Units : Render Output Units and Compute Units (CU)
  3. ^ Single-precision performance is calculated from the base (or boost) core clock speed based on a FMA operation.
Embedded[edit]

In February 2018, AMD also announced the V1000 series of embedded Zen+Vega APUs with four SKUs.[104]

Model Release
date
CPU GPU Memory
support
TDP
Cores
(threads)
Clock rate (GHz) Cache[a] Model Config[b] Clock Processing power (GFLOPS)[c]
Base Boost L2 L3
V1202B Unknown 2 (4) 2.3 3.2 1 MB 4 MB RX Vega 3 192:12:16
3 CU
1000 MHz 384 DDR4-2400
dual-channel
12–25 W
V1605B Unknown 4 (8) 2.0 3.6 2 MB RX Vega 8 512:32:16
8 CU
1100 MHz 1126.4
V1756B Unknown 3.25 1300 MHz 1331.2 DDR4-3200
dual-channel
35–54 W
V1807B Unknown 3.35 3.8 RX Vega 11 704:44:16
11 CU
1830.4
  1. ^ AMD defines 1 kilobyte (KB) as 1024 bytes, and 1 megabyte (MB) as 1024 kilobytes.[28]
  2. ^ Unified Shaders : Texture Mapping Units : Render Output Units and Compute Units (CU)
  3. ^ Single-precision performance is calculated from the base (or boost) core clock speed based on a FMA operation.

Zen+ microarchitecture[edit]

CPUs: Pinnacle Ridge / Colfax[edit]

The first Ryzen 2000 series of CPU products based on the Zen+ microarchitecture, code named Pinnacle Ridge, were announced for preorder on April 13, 2018[105] and launched six days later.

Model Release Date
& Price
Cores
(threads)
Clock rate (GHz) Cache[a] Socket PCIe lanes[b] Memory
support
TDP
Base PB2 L1 L2 L3
Entry-level
Ryzen 3 2300X[107][108] September 11, 2018
OEM
4 (4) 3.5 4.0 384KB 512 KB
per core
8 MB AM4 24 DDR4-2933
dual-channel
65 W
Mainstream
Ryzen 5 2500X[107][108] September 11, 2018
OEM
4 (8) 3.6 4.0 384KB 512 KB
per core
8 MB AM4 24 DDR4-2933
dual-channel
65 W
Ryzen 5 2600E[107] September 11, 2018
OEM
6 (12) 3.1 4.0 578KB 16 MB DDR4-2666
dual-channel[109]
45 W
Ryzen 5 2600[c][111][112] April 19, 2018
US $199
3.4 3.9 576KB DDR4-2933
dual-channel
65 W
Ryzen 5 2600X[111][112] April 19, 2018
US $229
3.6 4.2 576KB 95 W
Performance
Ryzen 7 2700E[107] September 11, 2018
OEM
8 (16) 2.8 4.0 768KB 512 KB
per core
16 MB AM4 24 DDR4-2666
dual-channel[113]
45 W
Ryzen 7 2700[c][111][112] April 19, 2018
US $299
3.2 4.1 DDR4-2933
dual-channel
65 W
Ryzen 7 PRO 2700X[c] September 6, 2018
OEM
3.6 4.1 105 W
Ryzen 7 2700X[111][112] April 19, 2018
US $329
3.7 4.3
High-end desktop (HEDT)
Ryzen Threadripper 2920X[114][115] October 2018
US $649
12 (24) 3.5 4.3 1,152KB 512 KB
per core
32 MB TR4 64 DDR4-2933
quad-channel
180 W
Ryzen Threadripper 2950X[114][115] August 31, 2018
US $899
16 (32) 3.5 4.4 1,536KB
Ryzen Threadripper 2970WX[114][115] October 2018
US $1299
24 (48) 3.0 4.2 2,304KB 64 MB 250 W
Ryzen Threadripper 2990WX[114][115] August 13, 2018
US $1799
32 (64) 3.0 4.2 3,072KB
  1. ^ AMD defines 1 kilobyte (KB) as 1024 bytes, and 1 megabyte (MB) as 1024 kilobytes.[28]
  2. ^ PCIe lane count includes 4 lanes used for connectivity to the chipset.[106]
  3. ^ a b c Model also available as PRO variant for OEMs, which may offer additional features not listed in this table. PRO models were released by AMD on September 6, 2018.[110]

APUs: Picasso[edit]

Mobile[edit]
Model Release
date
CPU GPU Memory support TDP Part number
Cores
(threads)
Clock rate (GHz) Cache[a] Model Config[b] Clock Processing power (GFLOPS)[c]
Base Boost L2 L3
Athlon 300U[116] January 6, 2019 2 (4) 2.4 3.3 1 MB 4 MB Vega 3 192:12:4
3 CU[117]
1000 MHz 384.0 DDR4-2400
dual-channel
15 W YM300UC4T2OFG
Ryzen 3 3200U[118] 2.6 3.5 1200 MHz 460.8 YM3200C4T2OFG
Ryzen 3 3300U[119] 4 (4) 2.1 2 MB Vega 6 384:24:8
6 CU[120]
921.6 YM3300C4T4MFG
Ryzen 5 3500U[121] 4 (8) 3.7 Vega 8 512:32:16
8 CU[122]
1228.8 YM3500C4T4MFG
Ryzen 5 3550H[123] 35 W YM3500C4T4MFG
Ryzen 7 3700U[124] 2.3 4.0 Vega 10 640:40:16
10 CU[125]
1400 MHz 1792.0 15 W YM3700C4T4MFG
Ryzen 7 3750H[126] 35 W YM3700C4T4MFG
  1. ^ AMD defines 1 kilobyte (KB) as 1024 bytes, and 1 megabyte (MB) as 1024 kilobytes.[28]
  2. ^ Unified Shaders : Texture Mapping Units : Render Output Units and Compute Units (CU)
  3. ^ Single precision performance is calculated from the base (or boost) core clock speed based on a FMA operation.
Desktop[edit]

TBA[127]

Zen 2 microarchitecture[edit]

CPUs: Matisse[edit]

On January 9, 2019 during a CES keynote event[128], AMD CEO Lisa Su gave an early look at third-generation Ryzen desktop processors. Su showed in-hand an exposed eight-core Zen 2 desktop processor utilizing a chiplet design composed of a larger 14 nm I/O die and a separate, smaller 7 nm CPU die. An on-stage team of employees also demonstrated a test system with an eight-core Zen 2 desktop processor achieving multithreaded performance directly comparable to the Intel Core i9-9900K in Maxon Cinebench R15 while consuming 30% less total system power.[129] Later that day in a question and answer session, Su confirmed that the unused space on the processor package would be used for an additional CPU chiplet, bringing the maximum total core count to an unspecified quantity in excess of eight cores.[130]

On May 27th, 2019, the company launched its third-generation Ryzen family at Computex in Taipei. They are all based on AMD’s 7nm Zen 2 cores and utilize the same AM4 socket as prior models for continuity and ease of upgrades, and all are the first CPUs featuring the next-generation PCIe 4 platform. Its architecture offers a 15 percent instruction-per-clock (IPC) uplift and half the energy per operation. Plus twice the cache size, re-optimized instruction cache, larger Op cache, double the floating point performance, improved branch prediction, and better instruction pre-fetching. They are expected to launch on July 7, 2019.

Model Release Date
& Price
Cores
(threads)
Clock rate (GHz) Cache[a] Socket PCIe lanes Memory
support
TDP
Base PB2 L1 L2 L3
Mainstream
Ryzen 5 3600 July 7, 2019
US $199
6 (12) 3.6 4.2 64 KB
per core
512 KB
per core
32 MB AM4 24 DDR4-3200
dual-channel
65 W
Ryzen 5 3600X July 7, 2019
US $249
3.8 4.4 95 W
Performance
Ryzen 7 3700X July 7, 2019
US $329
8 (16) 3.6 4.4 64 KB
per core
512 KB
per core
32 MB AM4 24 DDR4-3200
dual-channel
65 W
Ryzen 7 3800X July 7, 2019
US $399
3.9 4.5 105 W
Ryzen 9 3900X July 7, 2019
US $499
12 (24) 3.8 4.6 64 MB
Ryzen 9 3950X Sep, 2019
US $749
16 (32) 3.5 4.7
  1. ^ AMD defines 1 kilobyte (KB) as 1024 bytes, and 1 megabyte (MB) as 1024 kilobytes.[28]


Initial reception[edit]

The first Ryzen 7 (1700, 1700X, and 1800X) processors debuted in early March 2017 and were generally well received by hardware reviewers.[131][132][133] 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.[134] 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] Power consumption and heat were found to be highly competitive with Intel, and the included Wraith coolers were generally competitive with higher-priced aftermarket solutions.

Ryzen'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 of the i7 7700K.[135] One reviewer found that Ryzen chips would typically outperform competing Intel i7 processors for a fraction of the price when all eight cores were utilized.[135]

One complaint among a subset of reviewers, however, was that Ryzen processors fell behind their Intel counterparts when running older games, or running certain newer games at mainstream resolutions such as 720p or 1080p.[136] AMD acknowledged the gaming performance deficit at low resolutions during a Reddit "Ask Me Anything Q & A thread", where they explained that updates and patches were being developed.[137] Subsequent updates to Ashes of the Singularity: Escalation and Rise of the Tomb Raider increased frame rates 17–31% on Ryzen systems.[138][139] id Software announced in April 2017 it would optimize its future games to make use of the greater parallelism available on Ryzen CPUs.[140]

It has been suggested that low core utilization resulted in Ryzen processors being underutilized, therefore reflecting lower than expected scores, especially when coupled with the fact that Zen's lower IPC relies on full core utilization.[141][142][143] However, AMD and others have argued thread scheduling is not the fundamental issue to Windows 10 performance.[144][145] There were also issues with AM4 motherboards and their BIOS, which was resulting in many Ryzen chips being underclocked, partially shut off, or generally hindered by BIOS bugs.[citation needed]

Operating system support[edit]

Although AMD verified the ability for computers with Ryzen processors to boot Windows 7 and Windows 8, Microsoft does not officially support older versions of Windows on newer processors including AMD Ryzen and Intel Core i3/i5/i7 (Kaby Lake and later). Windows Update blocks updates from being installed on newer systems running versions older than Windows 10 – although that restriction can be avoided either by not installing its respective update, or be bypassed entirely with an unofficial patch.[146]

AMD initially announced that Ryzen chipset drivers would not be provided for Windows 7,[147] but AMD's Ryzen and Threadripper chipset driver packages do list and include official drivers for Windows 7.[148]

Ryzen processors are compatible with Linux; the full performance of Ryzen is enabled in kernel version 4.10 or newer.[149]

Known issues[edit]

Spectre[edit]

Substantially all modern high performance microprocessors, including Ryzen, were found to be susceptible to a new category of speculative execution vulnerabilities. The vulnerabilities can be mitigated without hardware changes via microcode updates and operating system workarounds, but the mitigations incur a performance penalty.[150] AMD Ryzen/Epyc suffer a zero to nine percent penalty from the mitigations depending on workload, comparing favorably to a penalty of in some cases more than 50% for Intel Core/Xeon processors,[151][152] in part as a result of the AMD processors not requiring mitigation against the related Meltdown vulnerability.[153]

AMD has announced that Zen 2, expected in 2019, will include a hardware fix.[154]

Segmentation Fault[edit]

Some early shipments of Ryzen 1000 series processors produced segmentation faults on certain workloads on Linux, especially while compiling code with GCC.[155] AMD offered to replace the affected processors with newer ones that are not affected by the problem.[156]

Alleged issues by CTS Labs[edit]

In early 2018, an Israeli firm called CTS Labs claimed to have discovered several major flaws in the Ryzen components ecosystem: Ryzenfall, which affects the Ryzen desktop CPUs; Fallout, which affects the Epyc CPUs; Masterkey, which affects both CPU classes; and Chimera, which affects the ASMedia-designed USB 3.1 silicon found in the Ryzen desktop SoCs.[157] The unusual behavior of the security firm, disclosing the vulnerabilities without giving AMD time to react, has raised concerns and questions regarding the legitimacy of the exploits.[158]

Further questions were raised when independent investigators dug into the history of the company and analyzed the video they had uploaded to the web.[159] Ultimately, investigators uncovered an article by Viceroy Research condemning AMD on the exploit and noted how the article was published less than half an hour after the exploits were revealed. Given the polish of the article which appears to be written many days in advance, and wording of the article which suggests that it is financially motivated, many were quick to accuse the exploit as a smear campaign engineered by Viceroy to short-sell AMD's stocks.[160]

AMD had since announced that while the exploits are real, they are severely overplayed as physical access to the server is required to exploit the flaws. AMD has also announced that the flaws can be fixed via microcode updates and that they are working on a fix for the issue.[161]

See also[edit]

References[edit]

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External links[edit]