BSOD after PC put to sleep connected to XMP
TLDR; Solution was to under-volt my RAM VDD to 1.31 V and VTT to 0,655 V
Good evening once again Gentleman,
I was neglecting this issue for 2 years.
I had workaround in place (do not put my PC into sleep mode) and didn't really care for solution...
Until recently, where I found same ram model for sale, half its price.
I decided "Why not to upgrade?", well aware of issues I had before.
And as I was afraid, the issue reoccurred.
Moreover, my workaround no longer did its magic...
I decided it is time to finally crack this on and find root cause.
And so I started, basics first.
I disabled XMP and downloaded newest BIOS from Gigabyte.
But that would be too easy now, wouldn't it?
So after confirming issue was still there, I started to wonder...
"How far can I push the speed before it becomes unstable?"
- 2400 MHz - stable,
- 2800 MHz - stable,
- 3000 MHz - stable,
- 3066 MHz - unstable,
- 3133 MHz - FAIL
At this point, I was already satisfied. 3 GHz compared to 3.2 GHz ain't that bad...
Probably wouldn't even notice the difference.
But I've decided to keep going. For science! For art! For fun!
And so my journey continued...
Suggested on many forums, I've decided to fiddle with voltage parameters.
I bumped it little by little up to 1.38V, my PC kept on crashing regardless.
I was considering going up to 1.4V, (and not a step further) but then I noticed something peculiar...
When I was checking on sensors in BIOS, I noticed VDD was jumping quite a lot.
This was interesting! At first I thought the reason for instability could be voltage jumping too much.
But I also noticed another thing. It never went to specified value. It was always above it...
This gave me a glimmer of hope. Last chance to redeem my G.Skill memory sticks!
So I set RAM speed back to 3066 MHz, this time together with voltage set down to 1.34V
And it was stable!
You probably know the rest of it (well duh, I added TLDR at the top).
I continued my tests. Whenever I received any signs of instability I degreased voltage by 1 point.
Baby steps, like last time. And here are the results:
3066 MHz. @ 1.34V - stable
3133 MHz. @ 1.33V - stable
3200 MHz. @ 1.32V - unstable
3200 MHz. @ 1.31V - STABLE AT RATED SPEED!
This concludes my story. I achieved desired speed and my system is stable.
I even verified putting PC to sleep will not break anything. (It looks stable so far) I am running tests as I am writing this.
At this point, after everything is finally over I suspect problem was with VRMs on X470 AORUS mobo (not cool Gigabyte)...
I was reluctant to write in this old post I created but I wanted people to know.
Sometimes increasing voltage might not be correct answer.
Sometimes you need to take things slow...
AND CHECK THE DAMN SENSORS!
PS. I also I written this because I was bored during my stability run....
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