Comments on: Zen 3 RAM Speeds: An Analysis of the Best RAM for Zen 3

By: Migs

Migs — Sun, 13 Dec 2020 03:49:22 +0000

what about 4 ranks of 3200MHz?

By: Jon S

Jon S — Thu, 26 Nov 2020 12:16:30 +0000

In reply to Ocguy.

Sure, if we wanted to find the highest speeds we could do that.

This was a more general investigation into what’s the best price/performance ratio for off-the-shelf RAM. I don’t consider raising voltages suitable to recommend for long term use since it introduces a bunch of other factors. Similarly, I’d take 32Gb of 3600MHz CL16 over 16gb of 4000MHz+ capable RAM – because that’s where the pricing goes.

I’ve continued my investigations, I can raise performance at 4000MHz/2000Mhz Fclck to match that of 3600MHz CL16 with tighter timings – but there are few opportunities to demonstrate real world benefits to this and the cost of the RAM isn’t justified for general/gaming use!

By: Krzysztof

Krzysztof — Thu, 26 Nov 2020 06:19:33 +0000

In reply to Ocguy. +1 to that, most likely even at 1900MHz they had tons of WHEA errors impacting overall performance, I my case I see gain up to 1900MHz but if I try to get FCLK 2000MHz 1:1 then it gets unstable and results are worse than 1600MHz

By: James

James — Wed, 25 Nov 2020 17:24:12 +0000

In reply to Harry. Thanks, Harry - glad you found it useful.

By: Harry

Harry — Tue, 24 Nov 2020 02:48:42 +0000

Very useful. Thanks a lot.

By: Bob

Bob — Fri, 20 Nov 2020 21:55:32 +0000

This was supremely useful and helpful, thank you!

By: Ocguy

Ocguy — Thu, 19 Nov 2020 11:23:23 +0000

Your infinity fabric most likely is not stable therefore speeds go down. You’ll have to play with voltages and use a benchmark as confirmation. Just increasing clocks and having it stable is not gonna cut it.