7960X is up and running, with first pass tune up, prices in China were crazy so I ordered on new egg and got a friend to carry in form Hong Kong…
DDR 6400 4x32G DR CL32-38-32
ADIA Bandwidth 183G Read, 69ns Latency (not sure why so high…)
Manual OC 5250, 5100, 5150, 5200 for each CCD respectively 1.225V, passes prime95 320k FFT, which is my personal stability threshold. Funny price 320k prime95 takes about 460W, but running COMSOL only about 300W average, max 350W.
Ran the COMSOL 6.1 50G model:
3h 15m, not bad.
This took 4h 47m on my 7950X, 50% faster for 3x the money, but I’ll take it…
Ran the COMSOL 6.2 10G CFD Only Model with following result:
| File | -numasets | -blas | -np | 7950X (s) | 7960X (s) |
|---|---|---|---|---|---|
| 10G CFD Only v6.2 | 2 | mkl | all | 1850 | 1288 |
| 10G CFD Only v6.2 | 1 | mkl | all | 1853 | 1294 |
| 10G CFD Only v6.2 | 4 | mkl | all | – | 1327 |
| 10G CFD Only v6.2 | 2 | aocl | all | – | 1391 |
| 10G CFD Only v6.2 | 1 | mkl | 16 | – | 1419 |
Note that 2 numasets looks to have best performance by like 0.5% or margin of error, matching numasets to CCD resulted in lower performance. AOCL is slower as others reported, using default MKL is probably the best for most tasks.
With 16 cores, it is slower, so we are still getting core scaling form 16 to 24 cores, starting to wonder if the 7970X would have been worth it.
Note that I did notice weird thread scheduling behavior, it was putting multiple comsol threads on a single CPU’s with HT, so I disabled HT in process lasso for the COMSOL processes to fix that, what is odd is I never did see this on my 7950X.