While the latest Intel Core Ultra processors have done away with Hyper Threading (HT), Intel Xeon CPUs continue supporting HT/SMT, including with their latest [1]Xeon 6300 series budget server processors. As the new AMD [2]EPYC 4005 "Grado" processors also support Simultaneous Multi-Threading (SMT) and can be found at the same core/thread count count as the flagship Xeon 6369P processor, it makes for an interesting look at comparing the SMT/HT performance impact and power efficiency. Here are some benchmarks showing the Xeon 6300 against the AMD EPYC 4005 in SMT performance.

[3]

Over the past week I carried out a fresh look at the Intel vs. AMD SMT/HT performance with the Xeon 6300 series continuing to support Hyper Threading unlike the newest Arrow Lake and Lunar Lake desktop/mobile processors foregoing HT. On the AMD side, SMT has continued to prove very effective from mobile/desktops to servers. Just a few weeks ago was looking at [4]the great SMT advantage with the AMD Ryzen AI Max "Strix Halo" while [5]SMT is very beneficial too for high core count AMD EPYC servers .

[6]

As for the testing today, the top-end Intel Xeon 6300 series processor is the Xeon 6369P providing 8 cores / 16 threads with HT enabled. With the AMD EPYC 4005 line-up there is the top-end [7]EPYC 4565P and EPYC 4585PX processors with 16 cores / 32 threads. For making this SMT/HT comparison as 1:1 as possible, the [8]AMD EPYC 4345P was used that is an 8-core / 16 thread CPU like the Xeon 6369P.

[9]

With the AMD EPYC 4345P and Intel Xeon 6369P they were tested both at their defaults (SMT enabled) and then again after rebooting the system with SMT disabled so just 8 cores/threads. Both the AMD EPYC 4005 and Intel Xeon 6300 series server processors were tested from similar Supermicro servers and with 2 x 32GB DDR5 ECC memory (Xeon 6300 being limited to DDR5-4800 while EPYC 4005 allows DDR5-5600), Solidigm P41 Plus NVMe SSD storage, and running on Ubuntu 25.04 with the Linux 6.14 kernel.

While running dozens of different multi-threaded benchmarks on each AMD EPYC and Intel Xeon processor with SMT on/off, the CPU power consumption was also monitored on a per-test basis for seeing the SMT/HT impact on power efficiency.



[1] https://www.phoronix.com/search/Xeon+6300

[2] https://www.phoronix.com/search/EPYC+4005

[3] https://www.phoronix.com/image-viewer.php?id=intel-xeon-6300-amd-epyc-4005-smt&image=smt_2025_1_lrg

[4] https://www.phoronix.com/review/amd-strix-halo-smt

[5] https://www.phoronix.com/review/amd-epyc-zen5-smt

[6] https://www.phoronix.com/image-viewer.php?id=intel-xeon-6300-amd-epyc-4005-smt&image=smt_2025_2_lrg

[7] https://www.phoronix.com/review/amd-epyc-4585px-4565p-benchmarks

[8] https://www.phoronix.com/review/amd-epyc-4345p

[9] https://www.phoronix.com/image-viewer.php?id=intel-xeon-6300-amd-epyc-4005-smt&image=smt_2025_3_lrg