BSOD with new 64gb RAM....what am I doing wrong?

Z-U

Z-U

Z-U

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6 Oct 2020
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Hi all, I wonder if someone can advise me on something...I'm a novice compared to you guys.

I have 64gb of Corsair Vengeance LPX....apparently sold as AMD Ryzen-ready or whatever the term was...

These dimms are CMK64GX4M2Z4000C18 (ver 3.44 if that's important).

Whenever I put them in the computer I've been going to the Bios and putting them to XMP 2000mhz....thats not 1:1 coupled mode with Fabric Clock, but I assumed it would still work. ANd it does - for a bit.

However, if I try to play a game or anything else more taxing like Unreal Engine - it BSOD's and needs a reboot and Bios reset

My questions is do you have to manually set the voltages for the memory to 1.35v if you're using XMP mode? I'd always assumes that putting it into XMP mode would change the voltages to the right settings....but maybe thats not the case? I've never had ram this fast - nor 64gb of oit. And having just checked the memory compatibility list on the Gigabyte website....these dimms are not actually listed yet...but I'm just hoping I've not wasted company money.

Spec:
Ryzen 9 5950 (PBO up to 4.5ghz only, I think the fabric clock is just running standard at 1800 - I've not tried higher and don't know how to)
Gigabyte X570 Aorus Master
Gigabyte 3090RTX Eagle OC (not overclocked)
MP600 C: drive
BeQuiet CPU AIO water cooler.
BeQuiet 601
BeQuiet 1000w PSU

Any advice on what I can do to stabilse this memory would be greatly appriecated. I can see it works...I just can't make it stable for strenuous tasks.

Thanks
 
I'll check that voltage...but setting it to 3600 - how do I do that? I can only see the default setting or XMP in the normal XMP option - not multiple profiles....I've never delved into the manual tuning of memory before.
 
Thanks for the responses....I think it's the manual tuning of the ram I don't understand....at all. Are there other profiles that are considered stable, but they just don't show up in the Bios?
 
Yeah I'm on F33 at the moment - but I see F34 is available. I'm guessing that won't make much difference. I'll try what you've suggested and check it's getting 1.35v too. Cheers guys - very helpful. I'm not sure this was what I intended. I have 32gb of TeamGroup 3600MHZ anyway....feels like overkill. :) (Which i always enjoy)
 
Grrrr this is so frustrating...

So first run - set XMP, but noticed the voltages are just set to Auto, so I changed it manually to 1.35v....no joy - just cycles the POST cycle two or three times and reset the bios back to normal - however it also said in the Memry Profile that XMP mode was active...but in CPUZ it's reporting JEDEC#16 numbers and 1333mhz uncore frequency.

So I then went and set the multiplier to 36 as per @stephenb's post....it didn't cycle the post sequence over and over - it booted first time successfully, but then in CPU-Z it's still just reporting 1333mhz JEDEC#16 numbers again...what am I doing wrong?

In CPUZ SPD Tab shows 4 timing tables.

JEDEC#16 : 1333mhz CL22-18-18-43-61 1.2v
JEDEC#17 : 1333mhz CL23-18-18-43-61 1.2v
JEDEC#18 : 1333mhz CL24-81-18-43-61 1.2v
XMP-4000 : 2000mhz CL18-22-22-42 64 1.35v

Even if I could get this running at 3600mhz - the capacity is what I bought them for. Anyone any further advice?

Thanks for all your help folks.

"Optimized For Ryzen"

https://www.corsair.com/uk/en/Categories/Products/Memory/VENGEANCE-LPX/p/CMK64GX4M2Z4000C18

....so whats happening here? Is it fundamentally that Zen 3 can't support with 4000mhz? Or Is it that the BIOS is not upto date? F34 is available, but release notes just say that it's just to support Cezanne APU's.
 
Sorry to keep answering my own thread.....got this up and running now - at 1.36v....what else can I do to improve the timings?

https://ibb.co/BBrR68L
BBrR68L
 
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