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EPYC 7251 - AMD
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Template:mpu EPYC 7251 is a dual-socket 64-bit octa-core x86 enterprise server microprocessor introduced by AMD in mid-2017. This processor is based on the Zen microarchitecture and is manufactured on a 14 nm process. The 7251 has a base frequency of 2.1 GHz with a turbo frequency of 2.9 GHz for a single active core. This chip has a TDP of 120 W and supports up to 2 TiB of octa-channel DDR4-2666 ECC memory per socket.


DIL16 Blank.svg Preliminary Data! Information presented in this article deal with a microprocessor or chip that was recently announced or leaked, thus missing information regarding its features and exact specification. Information may be incomplete and can change by final release.

Cache

Main article: Zen § Cache

[Edit/Modify Cache Info]

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Cache Organization
Cache is a hardware component containing a relatively small and extremely fast memory designed to speed up the performance of a CPU by preparing ahead of time the data it needs to read from a relatively slower medium such as main memory.

The organization and amount of cache can have a large impact on the performance, power consumption, die size, and consequently cost of the IC.

Cache is specified by its size, number of sets, associativity, block size, sub-block size, and fetch and write-back policies.

Note: All units are in kibibytes and mebibytes.
L1$768 KiB
786,432 B
0.75 MiB
L1I$512 KiB
524,288 B
0.5 MiB
8x64 KiB4-way set associative 
L1D$256 KiB
262,144 B
0.25 MiB
8x32 KiB8-way set associativewrite-back
L2$4 MiB
4,096 KiB
4,194,304 B
0.00391 GiB
  8x512 KiB8-way set associativewrite-back
L3$64 MiB
65,536 KiB
67,108,864 B
0.0625 GiB
  8x8 MiB16-way set associative 

Memory controller

[Edit/Modify Memory Info]

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Integrated Memory Controller
Max TypeDDR4-2666
Supports ECCYes
Max Mem2 TiB
Controllers4
Channels8
Max Bandwidth158.95 GiB/s
162,764.8 MiB/s
170.671 GB/s
170,671.263 MB/s
0.155 TiB/s
0.171 TB/s
Bandwidth
Single 19.89 GiB/s
Double 39.72 GiB/s
Quad 79.47 GiB/s
Hexa 119.21 GiB/s
Octa 158.95 GiB/s

Expansions

The EPYC 7351P has 128 Gen 3 PCIe lanes.

[Edit/Modify Expansions Info]

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Expansion Options
PCIe
Revision3.0
Max Lanes128
Configs8x16, 32x4


Features

[Edit/Modify Supported Features]

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Supported x86 Extensions & Processor Features
MMXMMX Extension
EMMXExtended MMX Extension
SSEStreaming SIMD Extensions
SSE2Streaming SIMD Extensions 2
SSE3Streaming SIMD Extensions 3
SSSE3Supplemental SSE3
SSE4.1Streaming SIMD Extensions 4.1
SSE4.2Streaming SIMD Extensions 4.2
SSE4aStreaming SIMD Extensions 4a
AVXAdvanced Vector Extensions
AVX2Advanced Vector Extensions 2
ABMAdvanced Bit Manipulation
BMI1Bit Manipulation Instruction Set 1
BMI2Bit Manipulation Instruction Set 2
FMA33-Operand Fused-Multiply-Add
AESAES Encryption Instructions
RdRandHardware RNG
SHASHA Extensions
ADXMulti-Precision Add-Carry
CLMULCarry-less Multiplication Extension
F16C16-bit Floating Point Conversion
x86-1616-bit x86
x86-3232-bit x86
x86-6464-bit x86
RealReal Mode
ProtectedProtected Mode
SMMSystem Management Mode
FPUIntegrated x87 FPU
NXNo-eXecute
SMTSimultaneous Multithreading
AMD-ViAMD-Vi (I/O MMU virtualization)
AMD-VAMD Virtualization
SenseMISenseMI Technology
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Facts about "EPYC 7251 - AMD"
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EPYC 7251 - AMD#io +
base frequency2,100 MHz (2.1 GHz, 2,100,000 kHz) +
clock multiplier21 +
core count8 +
core family23 +
core model1 +
core nameNaples +
core steppingB2 +
designerAMD +
die area213 mm² (0.33 in², 2.13 cm², 213,000,000 µm²) +
die count4 +
familyEPYC +
first announcedJune 20, 2017 +
first launchedJune 20, 2017 +
full page nameamd/epyc/7251 +
has advanced vector extensionstrue +
has advanced vector extensions 2true +
has amd amd-v technologytrue +
has amd amd-vi technologytrue +
has amd secure encrypted virtualization technologytrue +
has amd secure memory encryption technologytrue +
has amd sensemi technologytrue +
has amd transparent secure memory encryption technologytrue +
has ecc memory supporttrue +
has featureAdvanced Vector Extensions +, Advanced Vector Extensions 2 +, Advanced Encryption Standard Instruction Set Extension + and SenseMI Technology +
has locked clock multiplierfalse +
has simultaneous multithreadingtrue +
has x86 advanced encryption standard instruction set extensiontrue +
instance ofmicroprocessor +
is multi-chip packagetrue +
isax86-64 +
isa familyx86 +
l1$ size768 KiB (786,432 B, 0.75 MiB) +
l1d$ description8-way set associative +
l1d$ size256 KiB (262,144 B, 0.25 MiB) +
l1i$ description4-way set associative +
l1i$ size512 KiB (524,288 B, 0.5 MiB) +
l2$ description8-way set associative +
l2$ size4 MiB (4,096 KiB, 4,194,304 B, 0.00391 GiB) +
l3$ description16-way set associative +
l3$ size32 MiB (32,768 KiB, 33,554,432 B, 0.0313 GiB) +
ldateJune 20, 2017 +
manufacturerGlobalFoundries +
market segmentServer +
max case temperature354.15 K (81 °C, 177.8 °F, 637.47 °R) +
max cpu count2 +
max memory2,097,152 MiB (2,147,483,648 KiB, 2,199,023,255,552 B, 2,048 GiB, 2 TiB) +
max memory bandwidth143.1 GiB/s (146,534.4 MiB/s, 153.652 GB/s, 153,652.455 MB/s, 0.14 TiB/s, 0.154 TB/s) +
max memory channels8 +
max pcie lanes128 +
microarchitectureZen +
min case temperature273.15 K (0 °C, 32 °F, 491.67 °R) +
model number7251 +
nameEPYC 7251 +
packageFCLGA-4094 + and SP3 +
part numberPS7251BFV8SAF + and PS7251BFAFWOF +
process14 nm (0.014 μm, 1.4e-5 mm) +
release price$ 574.00 (€ 516.60, £ 464.94, ¥ 59,311.42) +
series7000 +
smp max ways2 +
socketSP3 + and LGA-4094 +
supported memory typeDDR4-2400 +
tdp120 W (120,000 mW, 0.161 hp, 0.12 kW) +
technologyCMOS +
thread count16 +
transistor count19,200,000,000 +
turbo frequency (1 core)2,900 MHz (2.9 GHz, 2,900,000 kHz) +
turbo frequency (2 cores)2,900 MHz (2.9 GHz, 2,900,000 kHz) +
turbo frequency (3 cores)2,900 MHz (2.9 GHz, 2,900,000 kHz) +
turbo frequency (4 cores)2,900 MHz (2.9 GHz, 2,900,000 kHz) +
turbo frequency (5 cores)2,900 MHz (2.9 GHz, 2,900,000 kHz) +
turbo frequency (6 cores)2,900 MHz (2.9 GHz, 2,900,000 kHz) +
turbo frequency (7 cores)2,900 MHz (2.9 GHz, 2,900,000 kHz) +
turbo frequency (8 cores)2,900 MHz (2.9 GHz, 2,900,000 kHz) +
word size64 bit (8 octets, 16 nibbles) +