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Does setting tRCDWR to 8 do anything? (Patreon)

Published:
2022-08-30 08:40:01
Edited:
2022-08-30 08:40:19
Imported:
2026-06
Tags:

Content

Yes it does.

Py Prime 2B running on a 4750G with 1xCh 1Rx8 Hynix 8Gb CJR

2400Mbps (timings have more impact at lower memory clocks as each tick is longer)

12-16/8-16-28-1T 23.862s   23.833s   23.749s

12-16/16-16-28-1T 24.417s   24.513s   24.372s

12-16/26-16-28-1T 25.715s   25.701s   25.712s 

On many many(probably most) DDR4 memory chips it's possible to set tRCDWR to 8 with no effect on stability. As you can see from the Py Prime results this does lead to a slight performance increase. So there's 0 reason not set your tRCDWR to 8(if it's passing stress tests). The main reason I decided to make this post is because I see a lot of screenshots of people with Ryzen setups running tRCDWR at pretty much random numbers that aren't 8 even on ICs where I know with 100% certainty that 8 works.

Comments

Mike Quinton

When talking about the new Ryzen 7 CPUs, when you talked about the base frequency, my question is if a laptop can run at a low frequency and a desktop runs at 5.7 or so, what is the actual advantage of the higher frequency? I always hear that it makes programs run faster, so my question is faster than what? Doesn't software in and of itself limit the speed that it is supposed to run. If the game runs "too fast" what does that do the FPS? The same question applies to RAM in that if I do not XMP the RAM from 26 to 38, what difference does it make or doesn't matter only in games?