EPYC 9555P vs EPYC 9655

The EPYC 9555P packs 64 cores / 128 threads, while the EPYC 9655 offers 96 cores / 192 threads — the EPYC 9655 has 32 more cores. Boost clocks reach 4.4 GHz on the EPYC 9555P versus 4.5 GHz on the EPYC 9655 — a 2.2% clock advantage for the EPYC 9655 (base: 3.2 GHz vs 2.6 GHz). Both are built on the Turin (2024) architecture using a 4 nm process. In PassMark, the EPYC 9555P scores 135,441 against the EPYC 9655's 156,110 — a 14.2% lead for the EPYC 9655. Geekbench 6 single-core — the metric most relevant to gaming — records 2,815 vs 2,830, a 0.5% lead for the EPYC 9655 that directly translates to higher frame rates. Multi-core Geekbench: 29,406 vs 29,329 (0.3% advantage for the EPYC 9555P). L3 cache: 256 MB (total) on the EPYC 9555P vs 384 MB (total) on the EPYC 9655.

Both processors use the SP5 socket with PCIe 5.0. Both support up to DDR5-6000 memory speed. The EPYC 9655 supports up to 9 TB of RAM compared to 6 TB — 40% more capacity for professional workloads. Both feature 12-channel memory with ECC support. Both provide 128 PCIe lanes. Chipset compatibility: SP5 (EPYC 9555P) and SP5 (EPYC 9655).

Both support AMD-V, SEV-SNP virtualization. Primary use case: EPYC 9555P targets Data Center / Single Socket, EPYC 9655 targets Data Center. Direct competitor: EPYC 9555P rivals Xeon 6979P; EPYC 9655 rivals Xeon 6979P.

The EPYC 9555P launched at $7983 MSRP, while the EPYC 9655 debuted at $11852. At current prices ($6130 vs $11852), the EPYC 9555P is $5722 cheaper. In terms of value (PassMark points per dollar), the EPYC 9555P delivers 22.1 pts/$ vs 13.2 pts/$ for the EPYC 9655 — making the EPYC 9555P the 50.6% better value option.