Re: buying a new computer
Posted: Sun Aug 18, 2019 6:25 am
With potentially double the code count of the 2990wx, I guess the new one will cost a lot more.
What do you mean by "double the code count"? Ahhh...you mean double the "core" count! ( Yes the 64-core version will be more expensive if/when it arrives). I'm not thinking about that yet as I have no specs on it and see little point in speculation. The 32-core is a little more tangible and likely more affordable.Dann Corbit wrote: ↑Sun Aug 18, 2019 6:25 am With potentially double the code count of the 2990wx, I guess the new one will cost a lot more.
Thanks!jpqy wrote: ↑Sun Aug 18, 2019 3:09 pm @joost ,then maybe you are interested to read this review:
AMD EPYC 7002 Series Rome Delivers a Knockout
https://www.servethehome.com/amd-epyc-7 ... -knockout/
And on Page 8 you see asmFish benchmarks with it!
JP.
Indeed, it looks like they didn't fix it. I don't need it for computer chess per se, but I'm also doing cryptography and in a new chess engine I'm working on I make heavy use of PEXT() in the evaluation function.jpqy wrote: ↑Sun Aug 18, 2019 8:04 pm Ipman has benches with the new AMD Ryzen R9 3900X
and BMI2 is still clearly slower then pop version on AMD cpu's..
http://www.ipmanchess.yolasite.com/amd- ... -bench.php
JP.
They have full AVX2 support and all data paths and EU's are now 256-bit. So, AVX2 shouldn't be "slow" on the new CPU's. AVX2 performance is on par with all intel CPU's EVEN when executing highly optimized Intel code. No AVX-512 support that I'm aware of.Joost Buijs wrote: ↑Mon Aug 19, 2019 6:44 amIndeed, it looks like they didn't fix it. I don't need it for computer chess per se, but I'm also doing cryptography and in a new chess engine I'm working on I make heavy use of PEXT() in the evaluation function.jpqy wrote: ↑Sun Aug 18, 2019 8:04 pm Ipman has benches with the new AMD Ryzen R9 3900X
and BMI2 is still clearly slower then pop version on AMD cpu's..
http://www.ipmanchess.yolasite.com/amd- ... -bench.php
JP.
AMD also has slow AVX2, no AVX512 and no BF16 like the upcoming Intel 'Cooper Lake' chips. If you just use the machine to run Stockfish or any other chess engine it probably doesn't matter, but if you like to program and experiment with new algorithms it could be a drawback.
Benchmarks show the same AVX2 performance because they compare 56 Intel cores with 128 AMD cores, so that is not really on par. AMD gives you a lot of cores for the money, but Intel still has the higher performance when you do the comparison with an equal number of cores.Zenmastur wrote: ↑Mon Aug 19, 2019 12:03 pmThey have full AVX2 support and all data paths and EU's are now 256-bit. So, AVX2 shouldn't be "slow" on the new CPU's. AVX2 performance is on par with all intel CPU's EVEN when executing highly optimized Intel code. No AVX-512 support that I'm aware of.Joost Buijs wrote: ↑Mon Aug 19, 2019 6:44 amIndeed, it looks like they didn't fix it. I don't need it for computer chess per se, but I'm also doing cryptography and in a new chess engine I'm working on I make heavy use of PEXT() in the evaluation function.jpqy wrote: ↑Sun Aug 18, 2019 8:04 pm Ipman has benches with the new AMD Ryzen R9 3900X
and BMI2 is still clearly slower then pop version on AMD cpu's..
http://www.ipmanchess.yolasite.com/amd- ... -bench.php
JP.
AMD also has slow AVX2, no AVX512 and no BF16 like the upcoming Intel 'Cooper Lake' chips. If you just use the machine to run Stockfish or any other chess engine it probably doesn't matter, but if you like to program and experiment with new algorithms it could be a drawback.
Regards,
Zenmastur