SiSoftware Sandra 20/21-R2x – Pushing AVX512

Note: We have updated R2 with R2x to fix an OpenCL GP-GPU bug discovered by Mark Poppin.

We are pleased to release R2x (version 31.25) update for Sandra 20/21 with the following changes:

Sandra 20/21 Press Release

Benchmark Support, Updates & Fixes

  • CPU Scientific Benchmark: greatly improved AVX512 GEMM (SGEMM, DGEMM) performance by using the larger 48kB L1D cache (on RKL and ICL-SP) and better prefetch. [note AVX2/FMA3 performance is also improved to some extent]
  • CPU Inter-Thread Efficiency Benchmark: reasonably improved AVX512 inter-thread transfers by using larger transfer blocks that take advantage of the larger 48kB L1D cache (on RKL and ICL-SP). [note AVX2/FMA3 performance is also improved to some extent]
  • Memory Bandwidth Benchmark:  modestly improved AVX512 bandwidth transfers by using the larger 48kB L1D cache( on RKL and ICL-SP) and smarter prefetching. [note AVX2/FMA3 performance is also improved to some extent]
Benchmark Old Sandra (RTM) New Sandra (R2) Old Sandra ( RTM) New Sandra (R2)
Processor RocketLake (RKL) i9-11900K Skylake-X (SKL-X) i9-7900X
Memory Bandwidth Integer AVX512 41 GB/s 42 GB/s [+2%] 56.3 GB/s 56.4 GB/s [+1%]
Memory Bandwidth Float AVX512 40.3 GB/s 41.4 GB/s [+3%] 56.1 GB/s 56.5 GB/s [+1%]
Inter-Core Bandwidth AVX512 83.7 GB/s 84.5 GB/s [+1%] 83.3 GB/s 94.68 GB/s [+14%]
Inter-Core Latencies AVX512 31ns (14.7, 32.2) 28.3ns (13.1, 29.4) [-9%] 77ns (15.7, 80.9) 53.6ns (14.3, 55.5) [-30%]
DGEMM Double AVX512 190 GFLOPS 284 GFLOPS [+49%] 196 GFLOPS 333 GFLOPS [+70%]
SGEMM Float AVX512 337 GFLOPS 586 GFLOPS [+74%] 599 GFLOPS 830 GFLOPS [+38%]

Please see our article Processor Multi-Core Efficiency: Inter-Thread Latency & Bandwidth Benchmarking for an in-depth look at the benchmark and an example of its results from a modern processor.

Hardware Support, Updates & Fixes

  • GP-GPU Processing OpenCL Benchmark: fixed kernel failures on most GP-GPUs.
  • All CPU Benchmarks: support Intel Pentium & Celeron (Atom “JasperLake”).
  • All CPU Benchmarks: preliminary support Intel Xeon (“IceLake-SP”).
  • All CPU Benchmarks: optimised Intel Core/Atom Hybrid (“Lakefield”) performance.
  • All CPU Benchmarks: initial fixes for detection that fails to detect TDP/other power values on AMD Mobile Ryzen all series. Please contact us if you have such a processor and can help with troubleshooting.

Additional Support, Updates & Fixes

  • Branding update: all brand images have re-done in high resolution for modern displays.
  • SiSoftware Official Benchmark Ranker: graphics update with new logo and rosette for #1 (gold), #2 (silver), #3 (bronze) and lower ratings.
  • All websites: Cloudflare CDN (HTTPS/3) to reduce client load times and support times of high load that would overwhelm the Ranker servers and cause DDOS. Please contact us if you experience any issues.

Reviews using Sandra 20/21:

Update & Download

Commercial version customers can download the free updates from their software distributor; Lite users please download from your favourite download site.

Download Sandra Commercial (Pro/Biz/Eng/Ent)

Download Sandra Lite

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