AMD EPYC Turin 128 Core Comparison: EPYC 9745 "Zen 5C" vs. EPYC 9755 "Zen 5"
The EPYC 9755 is a fantastic processor we have shown in many benchmark articles over the past year and a half. But if you are wanting to ensure maximum performance-per-Watt and/or your motherboard/server is limited to a 400 Watt TDP rating, the EPYC 9745 is a very interesting 128-core / 256-thread processor. It offered much of the performance of the EPYC 9755 with its Zen 5 cores but with Zen 5C was a nice advantage to the performance-per-Watt.
With the dense Zen 5(C) cores still having AVX-512 and all of the other ISA capabilities of the full Zen 5 cores, there was great performance overall out of the AMD EPYC 9745.
When taking the geometric mean of 555 benchmarks in total, the AMD EPYC 9745 was delivering about 90% the performance of its 128 core EPYC 9755 sibling. Considering that the EPYC 9745 has just 80% the TDP rating of the EPYC 9755, that's a nice showing for the EPYC 9745 with its dense cores. When pulling back to the 320 Watt lowest cTDP, it was around 98% the performance of the 400 Watt default.
Across the mix of different workloads tested, the EPYC 9745 consumed 73% the power of the EPYC 9755 across the mix of workloads tested. The peak CPU power was at 379 Watts for the EPYC 9745 compared to 497 Watts with the EPYC 9755. With the 320 Watt cTDP power configuration was the additional power savings.
And lastly the system DC power consumption as reported by the Corsair HX1500i power supply used for this Gigabyte server.
Overall the AMD EPYC 9745 offered good performance relative to the EPYC 9755 with its full Zen 5 cores and higher TDP while offering quite a nice lead in performance-per-Watt across the many workloads tested. The EPYC 9745 is a great choice for those concerned about maximizing the power efficiency of your EPYC 9005 series server build and/or limited to a maximum 400 Watt TDP rated processors by your server platform. See all of my benchmarks in full here.
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