Xeon 6 P-core vs E-core

Intel Xeon 6 comes in two core types. P-cores are performance cores. E-cores are efficient cores. P-core parts were codenamed Granite Rapids and include the 6900P and 6700P series. E-core parts were codenamed Sierra Forest and include the 6700E series. A P-core runs two threads and supports AVX-512 and AMX, Intel's matrix instruction set. Intel's 6780E listing shows AVX2 and no AVX-512, and Intel states AVX-512 is supported only on P-core parts.

Core counts diverge. Intel cites up to 128 P-cores per socket and up to 288 E-cores. The 6980P has 128 cores, 256 threads, 500 W, 12 memory channels of DDR5-6400 or MRDIMM-8800, and 96 PCIe 5.0 lanes on socket FCLGA7529. The 6767P has 64 cores, 350 W, 8 channels and 88 lanes on FCLGA4710. The 6780E has 144 cores and 144 threads at 330 W, with 8 channels of DDR5-6400, 88 lanes and the same FCLGA4710 socket.

Choose P-cores for a GPU host or anything using AVX-512 or AMX. Choose E-cores for dense scale-out services where core count per socket decides. Memory channels matter too, 12 on the 6980P and 8 on the 6767P and 6780E.

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Last verified October 30, 2026.