AMD EPYC 7451 socket: SP3

What the EPYC 7451 is

The EPYC 7451 is a twenty four core, forty eight thread server processor from the Naples family. It launched on June 20, 2017 with a 2.3 GHz base and up to 3.2 GHz boost at 180 W. Twenty four Zen cores cover virtual hosts and database nodes where core count and memory channels matter more than single thread peaks.

Sixty four megabytes of shared L3 cache feed virtual machines across four Zeppelin dies. Boost to 3.2 GHz applies to lightly threaded work, while all core loads settle lower for thermal headroom. The 14 nm process with four dies sets the 180 W envelope for 2U racks.

There is no integrated graphics, so management output comes from board BMC chips. ECC memory with RDIMM and LRDIMM support is standard for uptime. Pricing is omitted here because launch lists split across distributors.

AMD positions the 7451 between 16 core entry parts and 32 core flagships. Twenty four cores suit hosts that need lanes and channels without the top bin cost. The multiplier is locked for server stability.

Socket and motherboard compatibility

The 7451 fits SP3 on single and dual socket server boards. Boards need a BIOS with Naples support and the exact SKU on the vendor list. Unlike single socket P parts, it runs in one or two socket designs.

Server boards carry eight DDR4 channels and 128 PCIe 3.0 lanes per CPU even on 24 core SKUs. Rack chassis need front to back airflow with vendor qualified heatsinks for 180 W sustained loads. The Socket vs chipset: what decides whether a CPU works guide explains why server fit follows socket plus board firmware.

The EPYC 7251 AMD EPYC 7251 is the 8 core entry on the same boards where lanes cover storage nodes. The 32 core 7501 class is the step up where threads dominate.

Memory, PCIe and cooling

Memory support is DDR4-2666 in eight channels up to 2 TB per socket, with ECC RDIMM or LRDIMM modules. One DIMM per channel holds 2666 pace most easily, while two DIMMs per channel may run at 2400 per board guidance. Bandwidth peaks near 170.7 GB per sec with full populations.

PCI Express arrives as version 3.0 with 128 lanes from the CPU for NICs, HBAs and NVMe. Dual socket nodes scale to 64 cores per box with shared I/O. Lane bifurcation follows the board manual before ordering retimers.

Cooling uses vendor 180 W server heatsinks with directed chassis airflow. The SP3 carrier frame mounts with three screws in numbered order using the board wrench. Inlet temperature decides sustained boost more than board brand.

Upgrade paths

On the same socket the step up is a 32 core part such as the EPYC 7501 where threads matter, keeping board and DDR4. Rome and Milan later reused SP3 with BIOS updates, so some 2019 boards accept newer generations where the maker lists them.

Moving past SP3 means a new board on SP5 with DDR5, since sockets and memory do not cross. Rack owners usually add memory or network cards before replacing processors. Used 7451 parts suit lab clusters where 24 cores balance cost and lanes.