How much faster is a Zen 5 Core compared to a Zen 5c Core?
I’ve run a few benchmarks on the AMD Ryzen AI 9 HX 370 forcing them to only use a single Zen 5 core, a single Zen 5c core, and repeating with their SMT counterpart.
I ran the crafty benchmark on a single Zen 5 Core, a single Zen 5c Core, and also with SMT on the respective core.
$ taskset -c 0,12 phoronix-test-suite benchmark crafty # 1 Zen 5 Core with SMT
$ taskset -c 0 phoronix-test-suite benchmark crafty # 1 Zen 5 Core without SMT
$ taskset -c 4,16 phoronix-test-suite benchmark crafty # 1 Zen 5c Core with SMT
$ taskset -c 4 phoronix-test-suite benchmark crafty # 1 Zen 5 Core without SMT
The crafty program only uses a single core. As the chart shows, SMT offers negligible improvement. A single Zen 5c is a lot slower than its Zen 5 counterpart.
What’s more interesting is comparing the results to the Intel Core Ultra 7 Processor 255H. Its P-Core scores 14.26 million nodes per second, 12 million with 1 E-Core, and 5.63 with 1 Low Power E-Core.
Let’s look at the smallpt benchmark. Unlike crafty, smallpt uses all cores.
$ taskset -c 0,12 phoronix-test-suite benchmark smallpt # 1 Zen 5 Core with SMT
$ taskset -c 0 phoronix-test-suite benchmark smallpt # 1 Zen 5 Core without SMT
$ taskset -c 4,16 phoronix-test-suite benchmark smallpt # 1 Zen 5c Core with SMT
$ taskset -c 4 phoronix-test-suite benchmark smallpt # 1 Zen 5 Core without SMT
As you can see the AMD Ryzen processor using SMT sees a significant improvement for both the Zen 5 and Zen 5c core.
Using all cores, the Intel Core Ultra 7 Processor 255H completes the benchmark in 6.4 seconds. 1 P-Core takes 66.3 seconds, 1 E-Core takes 83.8 seconds, and 1 Low Power E-Core takes 186.2 seconds. That Intel processor has 6 P-Cores, 8 E-Cores, and 2 Low Power E-Cores. It doesn’t have SMT (or HT as Intel call it).
And let’s repeat the exercise with the Coremark benchmark which also uses all cores.
$ taskset -c 0,12 phoronix-test-suite benchmark coremark # 1 Zen 5 Core with SMT
$ taskset -c 0 phoronix-test-suite benchmark coremark # 1 Zen 5 Core without SMT
$ taskset -c 4,16 phoronix-test-suite benchmark coremark # 1 Zen 5c Core with SMT
$ taskset -c 4 phoronix-test-suite benchmark coremark # 1 Zen 5 Core without SMT
Using all cores, the AMD Ryzen AI 9 HX 370’s Coremark of 650278 is significantly better than the Intel Core Ultra 7 Processor 255H’s 437865 iterations per second. That Intel processor 1 P-Core scores 55179, 1 E-Core scores 43979, and 1 Low Power E-Core scores 22876.
Pages in this article:
Page 1 – Interpret output from top
Page 2 – How much faster is a Zen 5 Core compared to a Zen 5c Core?
Complete list of articles in this series:
| Minisforum AI X1 Pro | |
|---|---|
| Introduction | Introduction to the series and interrogation of the machine |
| Benchmarks | Benchmarking the Minisforum AI X1 Pro |
| Power | Testing and comparing the power consumption |
| Jan | ChatGPT without privacy concerns |
| ComfyUI | Generate video, images, 3D, audio with AI |
| AMD Ryzen AI 9 HX 370 Cores | Primary (Zen 5) and Secondary Cores (Zen 5c) |