SiFive HiFive Premier P550 Announced As New RISC-V Developer Board

[Quackdoc]

Initial Geekbench scores are out. It's single core is shockingly low, The lack of SIMD aside, a lot of these don't hold up to claims from sifive https://browser.geekbench.com/v5/cpu...eline=22380132 that being said, it's not like geekbench is super optimized. However rpi4 is a A72 cpu, so the claims are a far cry away unless geekbench is just extremely poorly optimized in general.

Multicore results are somewhat more inline with what is expected.

EDIT: original reddit thread https://new.reddit.com/r/RISCV/comme...bench_results/

[Dawn]

For which you can just plug in an AMD GPU and encode/decode all day long at faster rates than the pi5.

This also harks back to the whole issue of AVX512 mostly being crap except for a few corner cases.... if you are doing a real long running program you'd write it for the GPU not the CPU.

Shrug. If you think SIMD ops are useless, feel free to tell Sifive, since the successors to the P550 (P670, P870) have included them.

I think they have somewhat narrow use cases myself, but there are definitely things where I'm glad to have them. Audio enc/dec is a big one. Crypto is another.

[PerformanceExpert]

Initial Geekbench scores are out. It's single core is shockingly low, The lack of SIMD aside, a lot of these don't hold up to claims from sifive https://browser.geekbench.com/v5/cpu...eline=22380132 that being said, it's not like geekbench is super optimized. However rpi4 is a A72 cpu, so the claims are a far cry away unless geekbench is just extremely poorly optimized in general.

Multicore results are somewhat more inline with what is expected.

EDIT: original reddit thread https://new.reddit.com/r/RISCV/comme...bench_results/

I think you used a 2.3GHz overclocked PI4. A typical result for a 1.8GHz rev1.5 PI4 seems to be around 210-220. Here is a comparison at the same frequency. If we just look at the clang score (a good approximation for integer IPC), it does just 13.6% better than a Cortex-A72 from 2015... That's pretty shocking considering the P550 has a private 256KB L2 and 4MB L3 while the PI4 has a shared 1024KB L2. The much larger L3 and higher memory bandwidth results in good MT scaling for the P550.

[Quackdoc]

I think you used a 2.3GHz overclocked PI4. A typical result for a 1.8GHz rev1.5 PI4 seems to be around 210-220. Here is a comparison at the same frequency. If we just look at the clang score (a good approximation for integer IPC), it does just 13.6% better than a Cortex-A72 from 2015... That's pretty shocking considering the P550 has a private 256KB L2 and 4MB L3 while the PI4 has a shared 1024KB L2. The much larger L3 and higher memory bandwidth results in good MT scaling for the P550.

ah interesting, these weren't my results but onts that were posted to reddit, but I see indeed. Interesting results.