RAM speed 3800Mhz worse than 3600Mhz in gaming

1 : Anonymous2021/04/04 14:39 ID: mjxfxf

Been testing the performance of my 5800X with 3800mhz vs 3600mhz speed and the performance is worse when using 3800mhz speed. Fps is lower in most games. Timings are the same for both speeds. Everything else in the bios is on auto. Infinity fabric is 1:1 for both speeds.

3600mhz - 1800 IF 16-18-18-36

3800mhz - 1900 IF 16-18-18-36

2 : Anonymous2021/04/04 14:42 ID: gtcn7uv

Probably have WHEA errors occurring at 3800mhz resulting in worse performance.

ID: gtdxivl

Just checked and no whea errors in event viewer.

ID: gtcnalk

How to check for WHEA errors?

ID: gtd06au

Windows event viewer. 1900fclk is not the most stable, depending on what mobo bios you are working with. What is your voltage to the memory?

ID: gtcnmlz

Should also run the built in windows memory check tool to confirm everything is stable

3 : Anonymous2021/04/04 14:45 ID: gtcnifa

Check FCLK for 3800, if on auto your mobo could keep it lower, not 1:1 ratio with memory and it’ll be slower, use Zen timings and post screen. If it’s 1:1 (FCLK 1900MHz) then you may have errors, not bsod like ones but enough to cause performance drop, check event manager for whea logger events

ID: gtdxk7w

Fclk is set to 1900 in bios, not auto.

4 : Anonymous2021/04/04 16:48 ID: gtd1pke

have you tried a proper ram benchmark? gaming results could be due to variance

5 : Anonymous2021/04/04 20:41 ID: gtdspuh

Run AIDA64 to confirm improved memory transfer speeds and lower memory latency. Also stress test using HCI memtest.

ID: gtdt06z

Also look at your tRFC memory timing. Optimizing that can help shave a few ns on the memory latency and helps with transfer speeds.

ID: gtdtbzz

Aida64 does confirm the improved transfer speeds and lower latency when running 3800 vs 3600 frequency.

ID: gtdvgm8

HCI memtest

does HCI memtest support usb via uefi/efi ?

nvm i just e-mailed them it does not, guess i could run it in windows PE tho.

6 : Anonymous2021/04/04 14:43 ID: gtcn8u3

Might not be fully stable?

7 : Anonymous2021/04/04 14:44 ID: gtcnemy

Look in the Event Viewer. It'll show any errors that occurred.

8 : Anonymous2021/04/04 14:49 ID: gtcnvxh

It could be unstable..just like this dude. The memory or mem controller ain't always running good just because the system can boot or has no crashes. Should also check the fclk to be sure that it's set to 1900 manual. If the fclk ain't matching the memclk you're hit with 9+ns penalty on memory latency

/comments/mjjvz0/why_5950x_with_fclk_1900_better_then_2000_mhz_in/" class="reddit-press-link" target="_blank" rel="noopener">https://reddit.com//comments/mjjvz0/why_5950x_with_fclk_1900_better_then_2000_mhz_in/

9 : Anonymous2021/04/04 19:22 ID: gtdjowx

Check the CPU clocks if you are using PBO because I generally notice a decline in speed aside from memory latency and bandwidth in synthetic benchmarks with my 3600 with 3200MHz CL14 vs 3600MHz CL14 because the max boost clocks are not as high on the CPU. Suspect the heat generated at the IO chip or memory controller influence the boost.

10 : Anonymous2021/04/04 15:19 ID: gtcrcs7

Coukd be your infinite fabric or ram with little errors. So check the fc and do a memtest86+(single core).

11 : Anonymous2021/04/04 20:52 ID: gtdu2r1

Trfc on auto is probably your problem

ID: gtdxfr4

What should it be set to?

ID: gte2a7t

I just upgraded to G.Skill Trident Z Neo F4-3600C16D-32GTZNC my self, now i am kinda curious to how to set trfc, i just figured out how to set tRC which i already manually correct since bios sets it to 85 instead of 58

ID: gte5joe

Try DRAM Calculator for Ryzen. I have been using it for my 3900X and just used it for a 5800X I just picked up.

I have the same memory as you and it's worked well with the fast settings on my board (ROG C8H Wi-fi).

You can download it here:

12 : Anonymous2021/04/05 00:31 ID: gtei16m

Are you manually specifying all of the secondary timings? If not, probably some of them are being run looser, or it's switched to GDM on instead of off.

ID: gtemnty

Can't boot with GDM off. It needs to be on. I have all my secondary timings on auto.

13 : Anonymous2021/04/04 14:42 ID: gtcn796

Check your infinity fabric speed vs ram speed I think I read somewhere that you get best performance if they match

You may need the tool “ zen timings” to check

ID: gtcr11t

It says that it's 1:1 in the description.


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