Question Computer doesnt like ram to be overclocked

[wingmans123]

Recently completed a build when trying to change my ram clock (to 6400) my computer fails to start or even post after multiple failed attempts it boots with uefi (or whatever its called). switch xmp off and clock back to auto no issues. im confused pls help. Current build

https://pcpartpicker.com/list/F6FgJn

 

[Lutfij]

What BIOS version are you on for your motherboard? When working with two sticks of ram on slots A2 and B2, enabling X.M.P in BIOS, can you get the system to operate with said overclock?

 

[USAFRet]

Recently completed a build when trying to change my ram clock (to 6400) my computer fails to start or even post after multiple failed attempts it boots with uefi (or whatever its called). switch xmp off and clock back to auto no issues. im confused pls help. Current build

https://pcpartpicker.com/list/F6FgJn

For the RAM, is that 2 sets of 2, or one set of 4?

Even though they are technically 'the same'...2 different sets may not play well together.

 

[wingmans123]

What BIOS version are you on for your motherboard? When working with two sticks of ram on slots A2 and B2, enabling X.M.P in BIOS, can you get the system to operate with said overclock

i havent flashed the bios its a fairly new board i didnt see updates on the website for it

 

[wingmans123]

For the RAM, is that 2 sets of 2, or one set of 4?

Even though they are technically 'the same'...2 different sets may not play well together.

2 sets of 2 same exact the only thing different are the serial numbers

 

[USAFRet]

2 sets of 2 same exact the only thing different are the serial numbers

Which is not 'exact same'.
RAM is sold in sets for a reason.

Those 2 sets of RAM may have come from different factories, with slightly different tolerance levels.

They may not (apparently DO not) play well together.

If you want/need 64GB, you should have bought a set of 2x 32GB.

 

[Zerk2012]

2 sets of 2 same exact the only thing different are the serial numbers

That were not tested to work together.
You can try setting it to XMP then manually change the speed to 6000.

 

[LinuxDevice]

2 sets of 2 same exact the only thing different are the serial numbers

RAM has far more timings than those on the package. When two or more RAM sticks are sold in the same package it guarantees that all of those timings (including the ones you do not see on the package) are compatible. It is possible that two packages of two could work together just fine, but there are plenty of stories here on this forum showing it doesn't always work out.

@Lutfij mentioned a BIOS update, maybe that would help, but that if it does, then it is due to better BIOS behavior (which might not be possible). Even if you were to go to all sticks of RAM in a single package, it probably wouldn't hurt to update the BIOS (though it can be a pain to do so; during an upgrade stick to only two sticks from one package, or with XMP off). My bet is that the issue is because of the differences in buying two packs of two instead of one pack of four.

 

[triplex1]

Download them manually so they work.

 

[Lutfij]

i havent flashed the bios its a fairly new board i didnt see updates on the website for it

You didn't state the BIOS version you're on for your motherboard. Neither have you verified if you've gained stability with enabling X.M.P in BIOS when working with one ram kit in slots A2 and B2.

 

[wingmans123]

You didn't state the BIOS version you're on for your motherboard. Neither have you verified if you've gained stability with enabling X.M.P in BIOS when working with one ram kit in slots A2 and B2.

BIOS Version/Date American Megatrends International, LLC. 4.13, 4/15/2024

 

[wingmans123]

Download them manually so they work.

what do you mean download manually ?

 

[triplex1]

what do you mean download manually ?

from 6400 to 6000

 

[Lutfij]

He meant to say downclock instead of download.

As for your BIOS, you have updates pending;
https://pg.asrock.com/mb/Intel/Z790 Nova WiFi/index.asp#BIOS
whereby the latest is version 7.01. Once you've flashed to the latest BIOS version, clear the CMOS, then try with two sticks of ram as stated in my prior post, enable X.M.P and then see if you regain stability. If yes, then power down, add on the two sticks of ram and then see if you're able to boot to OS GUI.

I wouldn't be surprised if it turns out to be your processor since you're on the 13th gen.

 

[wingmans123]

Well flashed bios was able to get the clock to 6000 but still bricks at 6400...

Those sticks are on the QVL too idk why I'm having this issue.

Do I buy new ram? they don't sell that brand in packs of 4 or I would of just bought that.

6000 is still fast but I paid for 6400 .

 

[Misgar]

Those sticks are on the QVL too idk why I'm having this issue.

Did the QVL mention that your RAM should be stable, but only when installing 2 DIMMs?

It's quite common that when you fit 4 sticks. you have to sacrifice some XMP speed. It's a bit like piling four heavy football players into a small car and finding its top speed is reduced.

Test all 4 sticks at XMP 6000MT/s for stability using MemTest86+ booted from a USB stick. Allow MemTest86+ to finish a complete run (several hours if you have 64GB).

If 4 sticks of RAM pass a complete run of MemTest86+ at 6000MT/s try 6200MT/s.

If 4 sticks of RAM fail a complete run of MemTest86+, reduce XMP in 200MT/s steps until stable.

6000 is still fast but I paid for 6400 .

RAM may not always work at the maximum advertised speed in all possible combinations of motherboard and CPU, especially if you fit RAM that was not purchased as a single kit of 4 matched DIMMs. Two unmatched pairs with exactly the same part number might have different secondary or tertiary timings and they probably contain memory chips from different batches. Subtle differences count when overclocking.