Can I get slightly different ram to work together ?

banton.org

banton.org

banton.org

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2x cmk64gx5m2b6000c38
and
2x CMH64GX5M2B6400C32

Both corsair vengeance 64 (2x32), one 6400, one 6000. Bios set to 6000.

I tried it and my pc booted but I was getting bios/reboot issues with long hangtime and constantly giving a change detection press F1 to enter bios.
 
I would test both pairs independently of each other first to make sure they work well. Then stick the 2x 6400 ram into the computer and set it manfully to similar timing as the 6000 pair manually and see if it works at those setting. If it does then introduce the 6000 set and then do further testing. Usually you buy matches pairs that have been verified to work together, but I have used unmatched pairs before and have managed to make them work many time.

If you manage to get into windows and you test a few programs and it works its not a sign of stability. I would use some kind of ram testing utility to make sure its stable. If you are doing critical work which taxes ram you dont want this to crash and loose your work.
 
banton.org said:
I tried it and my pc booted but I was getting bios/reboot issues with long hangtime and constantly giving a change detection press F1 to enter bios.
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At which speed were they running and was this done with XMP on, or off?

4x32GB sticks is demanding on the CPU's memory controller, you normally have to run them much slower than their rated speeds to get stability.

A later BIOS can help.
 
4x dual rank sticks is a big load on memory controller. Surprised it booted at all at 6000 for you, gives hope that it could be stabilised by manually setting timings and voltages. But probably need to back down to 5600-5800
Long training time on 128GB is expected, should be better when you find stable settings and turn on Memory Context Restore

The different kits is not that big of a deal, motherboards these days are quite good in setting lowest common denominator timings on mixed kits
 
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I have only tried it once at 6000, making no changes, xmp enabled already and the above was the outcome. I have kept the 6400 in and they are fine running at 6400 but briefly saw no issues when they were at 6000 (bios may have put them lower, I can't remember now). I think I will get rid of the 6000 and not worry about having so much ram for now. Maybe 128 is for the next build, in a few generations time. It seems a lot of people are supporting the above comments regarding mix and match and controllers doing a lot of work.
 
banton.org said:
I think I will get rid of the 6000 and not worry about having so much ram for now. Maybe 128 is for the next build, in a few generations time. It seems a lot of people are supporting the above comments regarding mix and match and controllers doing a lot of work.
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It is possible to run and if you need the memory you're usually better off, even if running at very slow speeds, but 96GB (2x48) or 2x64GB is likely to be easier than 4x32.

From what I've seen in the past, you can expect anywhere between 4000 and 5600 on Intel, with around 5000 being normal. I don't frequent those kind of forums though (like level1techs), so can't say I'm up to date.
 
banton.org said:
2x cmk64gx5m2b6000c38
and
2x CMH64GX5M2B6400C32

Both corsair vengeance 64 (2x32), one 6400, one 6000. Bios set to 6000.

I tried it and my pc booted but I was getting bios/reboot issues with long hangtime and constantly giving a change detection press F1 to enter bios.
Click to expand...
Short answer, no.

Long answer, not unless you get really lucky and you'll probably run at much slower speeds if you populate all 4 DIMM slots even with matched DIMMs so don't both.

Just get a 2 DIMM kit of the capacity you need.
 
My understanding is that it's never been a good idea to mix RAM of different specs.
 
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