Question PRIME Z690-P not working with all 4 RAM sticks

[berbes]

Hello! a client has a PRIME Z690-P with 4 Vengeance 16GB chips. No boot. i removed the RAM down to one stick, got it to boot. Updated BIOS (it was oooold), got it to boot with 3 sticks, but no boot on all 4. stuck in a completely different Kingston Fury Beat 8GB RAM stick in the 4th slot and it boots. I've swapped the sticks around...sometimes the BIOS see them, other times, not.

I'm thinking this has to be a click or two in the BIOS...I just have NO idea what those clicks are. These are the screenshots.

THANK YOU!!!!!

 

[logainofhades]

4 sticks and ddr5 do not work well together, without slowing them way down. Often, below JDEC's 4800 base speed. If they want 64gb ram, they should do a 2x32gb kit.

 

[berbes]

4 sticks and ddr5 do not work well together, without slowing them way down. Often, below JDEC's 4800 base speed. If they want 64gb ram, they should do a 2x32gb kit.

thank you, sir. this was an issue where everything worked for them until it didn't. i was hoping for a click somewhere in the BIOS to make it work again, but i appreciate the knowledge

 

[logainofhades]

I have heard that bios updates breaking such things before, ironically on Asus boards.

 

[berbes]

I have heard that bios updates breaking such things before, ironically on Asus boards.

thanks again. you've helped me in th epast, and it is GREATLY appreciated. i will be sure to follow those rules verbatten.

 

[Misgar]

PRIME Z690-P with 4 Vengeance 16GB chips. No boot

Corsair Vengeance has a bit of a reputation on user forums, which a good search will probably find.

Similarly, some people dislike Asus mobos, due (I believe) to poor after sales service amongst other things.

I have two recent Asus boards, one with a 3800X and four 16GB Corsair Vengeance DIMMs, the other with a 7950X and two Kingston Fury 32GB DIMMs. Both machines have 64GB total.

The old adage, two DIMMs are better than four DIMMs applies to many systems, especially when overclocking at XMP/EXPO/DOCP settings.

If you're having problems, disable DOCP and set the RAM back to JEDEC default (usually 4800MT/s for DDR5). If the system seems stable, boot from a MemTest86 USB stick and run a complete scan (several hours). Even with only one error, drop the RAM speed to 3800MT/s and run MemTest again.

Ideally, you should go out and purchase a single kit of 4 matched DIMMs, if you're dead set on running 4 DIMMs. If you buy two kits each containing 2 DIMMs, even if they have the same part number, they won't be exactly the same. The individual memory chips are "binned" and it's unlikely both pairs of DIMMs will be identical.

It's for this reason I bought 2 x 32GB Kingston Fury DDR5 DIMMs for my 7950X. I was lucky when I added two more Corsair Vengeance 16GB DIMMs to my 3800X, but they're only running a mild overclock of 3000MT/s. My DDR5 is running at JEDEC 4800MT/s. I value stability above speed and the kit is only rated at 4800MT/s.

 

[berbes]

Corsair Vengeance has a bit of a reputation on user forums, which a good search will probably find.

Similarly, some people dislike Asus mobos, due (I believe) to poor after sales service amongst other things.

I have two recent Asus boards, one with a 3800X and four 16GB Corsair Vengeance DIMMs, the other with a 7950X and two Kingston Fury 32GB DIMMs. Both machines have 64GB total.

The old adage, two DIMMs are better than four DIMMs applies to many systems, especially when overclocking at XMP/EXPO/DOCP settings.

If you're having problems, disable DOCP and set the RAM back to JEDEC default (usually 4800MT/s for DDR5). If the system seems stable, boot from a MemTest86 USB stick and run a complete scan (several hours). Even with only one error, drop the RAM speed to 3800MT/s and run MemTest again.

Ideally, you should go out and purchase a single kit of 4 matched DIMMs, if you're dead set on running 4 DIMMs. If you buy two kits each containing 2 DIMMs, even if they have the same part number, they won't be exactly the same. The individual memory chips are "binned" and it's unlikely both pairs of DIMMs will be identical.

It's for this reason I bought 2 x 32GB Kingston Fury DDR5 DIMMs for my 7950X. I was lucky when I added two more Corsair Vengeance 16GB DIMMs to my 3800X, but they're only running a mild overclock of 3000MT/s. My DDR5 is running at JEDEC 4800MT/s. I value stability above speed and the kit is only rated at 4800MT/s.

EXCELLENT reply. thanks so much for your time