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boost ram read speeds and lower latency with ryzen 3

oobymach

oobymach

Joined
Sep 27, 2019
Messages
1,213 (0.58/day)
Location
Canada
System Specs
System Name New compy
Processor AMD Ryzen 5800x3D
Motherboard MSI MPG x570S EDGE MAX WiFi
Cooling Noctua NH-D15S w. FHP141 + Xigmatek AOS XAF-F1451
Memory 32gb G.Skill Ripjaws V Samsung B-Die Dual Rank F4-4000C16D-32GVKA
Video Card(s) ASUS TUF GAMING RTX 4070ti
Storage 17tb (8+4tb WD Black HDD's, 2+2+0.5+0.5tb M.2 SSD Drives) + 16tb WD Red Pro backup drive
Display(s) Alienware AW2518H 24" 240hz, Sony X85K 43" 4k 120hz HDR TV
Case Thermaltake Core v71
Audio Device(s) iFi Nano Idsd Le, Creative T20 + T50, Sennheiser HD6Mix
Power Supply EVGA Supernova G2 1000w
Mouse Logitech G502 Hero custom w. G900 scroll wheel mod, Rival 3 + Rival 3 wireless, JLab Epic Mouse
Keyboard Corsair K68 RGB + K70 RGB + K57 RGB Wireless + Logitech G613
Software Win 10 Pro
Benchmark Scores https://valid.x86.fr/s2y7ny
Depending on your bios you should be able to adjust bclk slew rate, set it to the highest one, that's it. Preview image attached. Noticed turning it from auto to max (tested a few times) gave instant increase of about 1gbps on ram read speed and .5ns drop in latency. Enjoy. You may have to do a power off boot for it to work right. Post your results if it works for you.

I may have been observing something different because now my speeds are contradictory/opposite to my earlier results...tested under more identical circumstances to be sure. Sad face, thought I was on to something there.
 

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subbing to see results
 
Subbed questions!

Does it have to be MSI??
Does it have to be only 3000 zen?
AIDA64 benches??

oobymach said:
Depending on your bios you should be able to adjust bclk slew rate, set it to the highest one, that's it. Preview image attached. Noticed turning it from auto to max (tested a few times) gave instant increase of about 1gbps on ram read speed and .5ns drop in latency. Enjoy. You may have to do a power off boot for it to work right. Post your results if it works for you.

I may have been observing something different because now my speeds are contradictory to my earlier results...
Click to expand...

You're killin me here....

But it's ok. Should build off of that.

Try
Gear Down
Power Down
Both Disabled.
MemDrvStrength 40 ohm
can set all 4.
(If not better latency try different ohm)
Yes can make unstable system.

Other things you guys can try is un-parking your cores and run the system in performance mode. :toast:
 
Last edited by a moderator:
Here's my results tightening the crap out of timings. Took some bios and aida screenshots to show what I'm running now (have bumped proc odt to 60 ohms). Earlier today it was higher latency and slower read speeds @ same 3600mhz, monkeying around with timings got it this far. Any higher than 1800fclk and I get audio noise (static/popping) when the cpu is heavily tasked, tried a lot of things to correct it including slew rate adjustment but it won't go away. @ 1800mhz it's fine even when cpu is running p95. My ram is Samsung b-die 4400mhz kit @ 1.35v
 

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oobymach said:
Here's my results tightening the crap out of timings. Took some bios and aida screenshots to show what I'm running now (have bumped proc odt to 60 ohms). Earlier today it was higher latency and slower read speeds @ same 3600mhz, monkeying around with timings got it this far. Any higher than 1800fclk and I get audio noise (static/popping) when the cpu is heavily tasked, tried a lot of things to correct it including slew rate adjustment but it won't go away. @ 1800mhz it's fine even when cpu is running p95. My ram is Samsung b-die 4400mhz kit @ 1.35v
Click to expand...

Can you bump FCLK to 1900mhz?
 
After much testing and prodding I have tracked down the culprit (trfc) and dropped it until it broke (windows booted at 240 but crashed quickly after starting p95), then increased slightly to get stability and get an average of 64.3ns refresh @ 3666mhz ram 1833mhz fclk down from the 65.8 I was getting.

Your results may differ. I use samsung b-die ram and found it can take much tighter refresh than micron or other ram.

Here are the timing ranges I tested and pics of my timings and voltages now (most of which from 1usmus ram calculator with a couple tweaks), bumping vpp over 2.6 seems to have helped.

TRFC1- 244-270
TRFC2- 140-160
TRFC4- 90-120

timings.png

Untitled-aida 45test1833.png
 
Forgot to mention these speeds are made possible by slight ram overvolt, my bios runs ram at ~1.47v, with 1.35v ram it wouldn't go lower than trfc1-260.
 
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