AMD EPYC 7643P vs AMD EPYC 8534P Comparison
AMD EPYC 7643P
EPYC 8534P
PERFORMANCE BENCHMARKS
Analysis: AMD EPYC 7643P vs AMD EPYC 8534P
The Verdict
The benchmark data splits these two server CPUs into clearly different roles. The AMD EPYC 7643P wins 12 of the 17 recorded head-to-head tests, while the AMD EPYC 8534P takes 5 wins. However, the victories are not evenly distributed by importance. The EPYC 7643P dominates in every Cinebench test, all by the same 7% margin, and it also leads in PassMark's multithread, physics, random string sorting, and single-thread tests. The EPYC 8534P counters with massive wins in data compression (35.1% ahead), encryption (27.3%), extended instructions (67.5%), floating point math (33.6%), and integer math (31.7%).
For workloads that rely on traditional CPU rendering, physics simulation, or general single-thread responsiveness, the EPYC 7643P is the clear choice based on the recorded data. For server tasks involving data compression, encryption, or heavy math workloads that use extended instruction sets, the EPYC 8534P offers decisively higher throughput. The EPYC 7643P also holds a notable advantage in average benchmark score placement: it sits at 144824 compared to the EPYC 8534P's 185092 average. That said, the EPYC 8534P's average is inflated by its enormous wins in math and compression tests. Both processors rank in the 98th percentile of all CPUs in the database, so neither is a weak option.
Architecture Differences
The two chips come from different generations and designs. The EPYC 8534P belongs to the EPYC 8004 series, uses AMD's Zen 4c architecture with the Siena codename, and is built on a 5 nm process at TSMC. It packs 64 cores and 128 threads. The EPYC 7643P comes from the EPYC 7003 series, uses Zen 3 with the Milan codename, and is built on a 7 nm process, also at TSMC. It offers 48 cores and 96 threads. The newer process node gives the 8534P a density advantage, but the 7643P compensates with a higher boost clock: 3.60 GHz versus 3.10 GHz. Both share the same 2.30 GHz base clock.
Cache layouts differ significantly. The EPYC 8534P has 1 MB of L2 per core and a shared 128 MB L3. The EPYC 7643P has half the L2 per core (512 KB) but double the shared L3 at 256 MB. The L1 cache is identical at 64 KB per core. Transistor counts are similar: 35,500 million for the 8534P versus 33,200 million for the 7643P, but the die arrangement differs. The 8534P uses 4x 73 mm² dies, while the 7643P uses 8x 81 mm² dies.
Memory support is a major split. The EPYC 8534P uses DDR5 with a six-channel memory bus and 230.4 GB/s bandwidth. The EPYC 7643P uses DDR4 with an eight-channel bus and 204.8 GB/s bandwidth. Both support ECC memory. PCIe generations also differ: the 8534P offers Gen 5 with 96 lanes, while the 7643P offers Gen 4 with 128 lanes. The sockets are incompatible: SP6 for the 8534P and SP3 for the 7643P. Power envelopes are close, with the 8534P rated at 200 W TDP and the 7643P at 225 W.
Head-to-Head Benchmarks
The Cinebench results are uniform. Across all six Cinebench tests (R15, R20, and R23, each in single-core and multi-core), the EPYC 7643P wins by exactly 7%. The multi-core scores are 6623 versus 6160 in R15, 27598 versus 25668 in R20, and 65710 versus 61115 in R23. The single-core scores are 934 versus 869 in R15, 3895 versus 3623 in R20, and 9276 versus 8628 in R23. This consistency suggests the 7643P's higher boost clock and larger L3 cache give it a steady edge in both lightly threaded and fully threaded Cinebench workloads, despite having 16 fewer cores.
PassMark's multithread test also favors the 7643P, with a score of 77307 versus 71900, a 7% lead. The physics test shows a much larger gap: 8002 versus 3667, a 54.2% advantage for the 7643P. Random string sorting goes to the 7643P at 160274 versus 129479, a 19.2% lead. Single-thread scores follow the same pattern: 2655 versus 2441, an 8.1% edge.
The EPYC 8534P's wins come in math and data-heavy tasks. Data compression is its largest victory at 1791742 versus 1326051, a 35.1% margin. Integer math shows 514526 versus 390775, a 31.7% lead. Floating point math is 289443 versus 216592, a 33.6% edge. Data encryption scores 121728 versus 95606, up 27.3%. The biggest relative win is extended instructions, where the 8534P scores 112860 versus 67398, a 67.5% advantage. The only test where the 8534P loses badly is find prime numbers, scoring 278 versus 651, a 57.3% deficit that likely reflects the 7643P's higher per-core clock speed.
FAQ
Q: Which CPU has more cores and threads?
A: The AMD EPYC 8534P has 64 cores and 128 threads, while the AMD EPYC 7643P has 48 cores and 96 threads.
Q: Why does the EPYC 8534P lose Cinebench despite having more cores?
A: The recorded data shows the EPYC 7643P wins every Cinebench test by 7%. This aligns with its higher boost clock (3.60 GHz versus 3.10 GHz) and larger shared L3 cache (256 MB versus 128 MB), which can benefit rendering workloads.
Q: Which CPU is better for encryption workloads?
A: The EPYC 8534P wins data encryption by 27.3%, scoring 121728 versus 95606. Its architecture appears better suited for cryptographic operations in the recorded tests.
Q: Do both CPUs support ECC memory?
A: Yes, both the EPYC 8534P and the EPYC 7643P support ECC memory according to the database.
Q: What is the difference in memory bandwidth?
A: The EPYC 8534P has 230.4 GB/s bandwidth with six-channel DDR5, while the EPYC 7643P has 204.8 GB/s with eight-channel DDR4.
Q: Which CPU has a higher average benchmark score?
A: The EPYC 8534P has a higher average benchmark score at 185092, versus 144824 for the EPYC 7643P. This is driven by its large wins in math and compression tests, not by overall test count.
Where Each One Wins
The EPYC 7643P is the pick for rendering, simulation, and latency-sensitive tasks. It wins all Cinebench benchmarks (R15, R20, R23) in both single-core and multi-core modes by 7%. It also takes PassMark multithread (77307 versus 71900), physics (8002 versus 3667), random string sorting (160274 versus 129479), and single-thread tests (2655 versus 2441). The physics win is particularly large at 54.2%, suggesting strong per-core efficiency for simulation workloads. Its 256 MB L3 cache and 3.60 GHz boost clock likely contribute to these results.
The EPYC 8534P is the pick for data center throughput tasks. It wins data compression by 35.1%, data encryption by 27.3%, extended instructions by 67.5%, floating point math by 33.6%, and integer math by 31.7%. These are exactly the workloads that benefit from more cores and a newer architecture (Zen 4c on 5 nm). The extended instructions result is the standout, nearly 70% ahead, indicating specialized instruction handling that the Zen 3 based 7643P cannot match. For a server handling compression, encryption, or heavy math pipelines, the 8534P's 64 cores provide a decisive throughput advantage.
Specification Differences
The two processors differ in every major specification category except base clock, ECC support, and production status. The EPYC 8534P has 64 cores and 128 threads versus 48 cores and 96 threads for the EPYC 7643P. Boost clocks differ: 3.10 GHz for the 8534P, 3.60 GHz for the 7643P. The 8534P uses Zen 4c architecture on a 5 nm process, while the 7643P uses Zen 3 on 7 nm. Cache differs in L2 and L3: 1 MB per core L2 with 128 MB shared L3 for the 8534P, versus 512 KB per core L2 with 256 MB shared L3 for the 7643P. Memory support splits by generation: DDR5 six-channel at 230.4 GB/s for the 8534P, DDR4 eight-channel at 204.8 GB/s for the 7643P. PCIe lanes and generation also differ: Gen 5 with 96 lanes for the 8534P, Gen 4 with 128 lanes for the 7643P. The sockets are different (SP6 versus SP3), as are the TDP ratings (200 W versus 225 W). Transistor counts are 35,500 million versus 33,200 million, and die sizes are 4x 73 mm² versus 8x 81 mm². The launch MSRP for the EPYC 8534P is $4950, and for the EPYC 7643P it is $2722. Release dates are close, with the 7643P on 2023-09-04 and the 8534P on 2023-09-17.