On 07.09.2018 20:41, Olga Selyutina wrote: > ... > These sets of CPU and GPU are suitable for price (in our region): > *GPU* > GTX 1070 ~1700MHz, cuda 1920 - $514 > GTX 1080 ~1700MHz, cuda 2560 - $615 > GTX 1070Ti ~1700MHz, cuda 2432 - $615 > GTX 1080Ti ~1600MHz, cuda 3584 - $930 > > *CPU* > Ryzen 7 2700X - $357 > 4200MHz, 8/16 cores/threads, cache L1/L2/L3 768KB/4MB/16MB, 105W, max.T 85C > > Threadripper 1950X - $930 > 4000MHz, 16/32 cores/threads, cache L1/L2/L3 1.5/8/32MB, 180W, max.T 68C > > i7 8086K - $515 > 4800MHz, 6/12 cores/threads, cache L2/L3 1.5/12MB, 95W, max.T 100C > > i7 8700K - $442 > 4600MHz, 6/12 cores/threads, cache L2/L3 1.5/12MB, 95W, max.T 100C > > The most suitable combinations CPU+GPU are as follows: > 1) Ryzen 7 2700X + two GTX 1080 - $1587 > 1.1) Ryzen 7 2700X + one GTX 1080 + one GTX 1080*Ti* - $1900 (maybe?) > 2) Threadripper 1950X + one GTX 1080Ti - $1860 > 3) i7 8700K + two GTX 1080 - $1672 > 4) Ryzen 7 2700X + three GTX 1070 - $1900 > My suggestions: > Variant 1 seems to be the most suitable. > Variant 2 seems to be suitable only if the single simulation is running on > workstation > It’s a bit confusing that in synthetic tests/games performance of i7 8700 > is higher than Ryzen 7 2700. > ...
Sorry for jumping into the thread at this point, but depending on the problem size and type, it might happen that: - a single R2-2700X possibly cannot always saturate TWO GTX-1080/1080Ti (maybe Szilárd Páll can add some rule of thumb whether and when it can), - a larger Threadripper may suffer from memory bandwidth issues on many parallel threads in Gromacs, - due to AVX2_512, 6C/12T "Coffee Lake" i7 may be somehow faster than even 8C/16T Ryzen2 (at some scenarios significantly?) But it most probably depends on the circumstances. If you want to spend your money effectively, you have to perform at least some tests. I can provide some performance numbers I got after updating Gromacs to v.2018.3 lately on our aging lab hardware. Regards, Mirco ==> (I can provide the input file if required) ==>
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