Phoronix recently compared the impact of Simultaneous Multi-Threading (SMT) on Intel Xeon 678X “Granite Rapids WS” and AMD Ryzen Threadripper 9980X workstation processors. The testing aimed to evaluate performance differences with SMT enabled and disabled, and at matching core/thread counts.
The benchmarks were conducted using HP Z4 G6i workstation equipped with the 48 core/96 thread Intel Xeon 678X, and a System76 Thelio Major workstation with the 64 core/128 thread AMD Ryzen Threadripper 9980X. The Intel processor was tested both in its default configuration and with Hyper Threading disabled, reducing it to 48 cores/threads. The AMD processor was tested with SMT on and off, and also at 48 cores (using 6 cores per CCD enabled in the BIOS) to match the Intel CPU.
A range of SMT/HT-relevant workloads were used to compare the impact of Simultaneous Multi-Threading between the two processors. CPU power consumption and thermals were also monitored during the tests. The tests were performed using Fedora Workstation 44, the Linux 7.1 kernel, and GCC 16.2 compiler. These benchmarks represent the final results from testing conducted while the Intel workstation was in the Phoronix lab for review.
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