Revision as of 18:55, 21 June 2017

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 all cores. This chip has a TDP of 120 W and supports up to 2 TiB of octa-channel DDR4-2400 ECC memory per socket.

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]

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 KiB 4-way set associative   L1D$ 256 KiB 262,144 B 0.25 MiB 8x32 KiB 8-way set associative write-back L2$ 4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB     8x512 KiB 8-way set associative write-back L3$ 64 MiB 65,536 KiB 67,108,864 B 0.0625 GiB     8x8 MiB 16-way set associative

Memory controller

[Edit/Modify Memory Info]

	Integrated Memory Controller
	Max Type DDR4-2400 Supports ECC Yes Max Mem 2 TiB Controllers 8 Channels 8 Max Bandwidth 143.1 GiB/s 146,534.4 MiB/s 153.652 GB/s 153,652.455 MB/s 0.14 TiB/s 0.154 TB/s Bandwidth Single 17.88 GiB/s Double 35.76 GiB/s Quad 71.53 GiB/s Hexa 107.3 GiB/s Octa 143.1 GiB/s

In a dual-socket configuration, the maximum supported memory doubles to 4 TiB along with the maximum theoretical bandwidth of 286.2 GiB/s.

Expansions

The EPYC 7351P has 128 Gen 3 PCIe lanes.

[Edit/Modify Expansions Info]

	Expansion Options
	PCIe Revision 3.0 Max Lanes 128 Configs 8x16, 32x4

Features

[Edit/Modify Supported Features]

Supported x86 Extensions & Processor Features

MMX MMX Extension EMMX Extended MMX Extension SSE Streaming SIMD Extensions SSE2 Streaming SIMD Extensions 2 SSE3 Streaming SIMD Extensions 3 SSSE3 Supplemental SSE3 SSE4.1 Streaming SIMD Extensions 4.1 SSE4.2 Streaming SIMD Extensions 4.2 SSE4a Streaming SIMD Extensions 4a AVX Advanced Vector Extensions AVX2 Advanced Vector Extensions 2 ABM Advanced Bit Manipulation BMI1 Bit Manipulation Instruction Set 1 BMI2 Bit Manipulation Instruction Set 2 FMA3 3-Operand Fused-Multiply-Add AES AES Encryption Instructions RdRand Hardware RNG SHA SHA Extensions ADX Multi-Precision Add-Carry CLMUL Carry-less Multiplication Extension F16C 16-bit Floating Point Conversion x86-16 16-bit x86 x86-32 32-bit x86 x86-64 64-bit x86 Real Real Mode Protected Protected Mode SMM System Management Mode FPU Integrated x87 FPU NX No-eXecute SMT Simultaneous Multithreading AMD-Vi AMD-Vi (I/O MMU virtualization) AMD-V AMD Virtualization SenseMI SenseMI Technology