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-   -   Threadripper Pro will have 8-channel memory (https://www.mersenneforum.org/showthread.php?t=26472)

simon389 2021-02-06 18:48

Threadripper Pro will have 8-channel memory
 
[url]https://m.youtube.com/watch?v=y2_Tc-sEMK8[/url]
Will this be the new amazing Prime95 PRP CPU? Have there been any P95 benchmarks? It seems like memory bandwidth has been the main bottleneck.

henryzz 2021-02-06 20:41

[QUOTE=simon389;571015][url]https://m.youtube.com/watch?v=y2_Tc-sEMK8[/url]
Will this be the new amazing Prime95 PRP CPU? Have there been any P95 benchmarks? It seems like memory bandwidth has been the main bottleneck.[/QUOTE]

Memory bandwidth is often the issue. More recently some cpus have had enough L3 cache that memory won't be needed. This threadripper is likely to be one of them.

simon389 2021-02-10 04:48

Ok so will the Pro model of Threadripper with its 8 channel RAM actually be faster than regular Threadripper with its 4-channel RAM?

retina 2021-02-10 04:51

[QUOTE=simon389;571249]Ok so will the Pro model of Threadripper with its 8 channel RAM actually be faster than regular Threadripper with its 4-channel RAM?[/QUOTE]Maybe. Maybe not. That depends upon what program(s) you are running. The only way to know is to test it.

M344587487 2021-02-10 10:13

[QUOTE=henryzz;571027]Memory bandwidth is often the issue. More recently some cpus have had enough L3 cache that memory won't be needed. This threadripper is likely to be one of them.[/QUOTE]
For small FFT's it's definitely true that memory bandwidth is irrelevant, for large FFT's memory bandwidth should come into play as you probably want to increase worker count to decrease CCX-to-CCX communication, 16 discrete chunks of L3 is not ideal and needs to be worked around. The larger the FFT the more likely memory bandwidth comes into play, but as long as you tune to the point that CCX comm, cache contention, memory bandwidth and compute are in check you should be in the ballpark of optimal.


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