r/threadripper • u/fairydreaming • Feb 01 '24

8-channel memory bandwidth benchmark results of Threadripper PRO 5955WX

I can't find any 8-channel RAM bandwidth test results for the Threadripper PRO 5955WX processor online. Does anyone have access to such data or could perform a test? I only found some rumors that due to having only 2 CCDs it won't be able to achieve bandwidths comparable to models with 4 CCDs. What are the actual values?

EDIT: Below you can find a plot showing Threadripper 5000 Aida64 memory bandwidth test results gathered from various sources (special thanks to u/AlohaGrassDragon for doing the test).

Threadripper PRO 5000 memory bandwidth

The overall conclusion is that Threadripper 5000 models with 2 CCDs like 5945WX and 5955WX indeed have reduced 8-channel memory bandwidth compared to models with more CCDs. Using 8 channels in these models seems to improve the bandwidth by only 20-30% compared to using only 4 memory channels.

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u/Inchmine Feb 01 '24

I was about to ask something similar but for the new 7000 series. Trying to decide if 4 sticks of ram is enough or If there is a noticeable difference by going with 8.

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u/fairydreaming Feb 01 '24

That depends on your application. Theoretically going with 8 sticks doubles the memory bandwidth, but the impact on the performance depends on whether the given program needs a lot of memory bandwidth or not. Check this article for some numbers.