TalkChess.com

174.000.932 /128 threads pop .

You need to overclock it

Jouni wrote: ↑Sun Feb 09, 2020 9:45 am 174.000.932 /128 threads pop .

Something seems wrong with that benchmark. I've seen benches with EPIC 7742 CPU's reach 235Mnps on 128 threads. It has a base frequency of just 2.25 Ghz and a boost of 3.4 Ghz. Threadripper 3990x has a base of 2.9 Ghz and a boost of 4.3 GHZ. With an aggressive water cooling setup the 3990 has been seen with all cores locked at 4.3 Ghz and stable. Maybe this chip was exceptional but one would think the average chip might hit 4 Ghz stable. This disparity in clock speeds on what amounts to exactly the same cores and Threadrippers ability to handle faster memory than Epic leads me to believe this benchmark is a fraction of what is possible with the 3990. i.e. it's been nerfed. I would expect a minimum of 275 Mnps with fast RAM.

Regards,

Zenmastur

They wouldn't be using water cooling in regular benchmarks. Also, it has 4 memory channels instead of 8 in Epyc 7742. I don't think the tests are wrong - they show Threadriper 3990x as 11-19% faster than Epyc 7740. https://www.phoronix.com/scan.php?page= ... inux&num=7 and https://www.servethehome.com/amd-ryzen- ... benchmark/.

My problem with this CPU is 256 GB max RAM. I need a workstation for more than chess, so I won't be getting it.

Zenmastur wrote: ↑Sun Feb 09, 2020 12:23 pmI would expect a minimum of 275 Mnps with fast RAM.

275 Mnps is the performance of 2x Epyc 7742 with 128 cores and 256 threads.

If you check CPUZ you see it's a ES sample cpu AMD 3990X

and as cooling used a NZXT Kraken X62

https://www.servethehome.com/amd-ryzen- ... rkstation/

So we will see higher nodes/sec. in Ipman's list later on with Retail cpu + better cooling!

My problem with this CPU is 256 GB max RAM. I need a workstation for more than chess, so I won't be getting it.

Indeed !!! 256 GB of RAM as maximum seems like very little for that type of platform! This is the latest and the greatest for today and today normal desktops have 256 GB of RAM with 8 or 16 core machines. For 64 cores it would seem that there should be much more room to grow.

M ANSARI wrote: ↑Sun Feb 09, 2020 2:05 pm and today normal desktops have 256 GB of RAM with 8 or 16 core machines.

Normal 8-core desktop machines today would have 8GB of RAM or maybe 16GB, and 16-core desktops double that perhaps. 16 core desktop machines are also pretty rare, unless you count threads.

mmt wrote: ↑Sun Feb 09, 2020 1:43 pm They wouldn't be using water cooling in regular benchmarks. Also, it has 4 memory channels instead of 8 in Epyc 7742. I don't think the tests are wrong - they show Threadriper 3990x as 11-19% faster than Epyc 7740. https://www.phoronix.com/scan.php?page= ... inux&num=7 and https://www.servethehome.com/amd-ryzen- ... benchmark/.

My problem with this CPU is 256 GB max RAM. I need a workstation for more than chess, so I won't be getting it.

Water cooling is what AMD recommends if I recall. The problem with these benchmarks is you have no clue what configuration of the machine is. It could be total memory bandwidth is 85 GBs with 95 ns latency for all you know. Or as high as 120 GBs and 75ns latency. The two configurations will produce wildly different NPS. STH states DDR4-3200 but, nothing on what the timings are. Without this information is difficult to make any hard conclusions. Chess engines aren't known to be memory bandwidth hogs so I think latency is the key parameter. A Threadripper properly configured should have by far the lower latency memory as compared to EPYC.

I guess time will tell as more and more people post benchmarks.

Regards,

Zenmastur

The cooler they used, NZXT Kracken X62, doesn't have a full size cold plate that fits Threadrippers IHS. Nor is the radiator large enough to dissipate the kind of heat the 3990 can generate. So, I suspect we'll see better number in the future.