Ram Help On MEG z790 ACE

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DerMoo160b02ec

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I have read the stickied thread at the top and with that have a question I would like some advice with. Using 4 ddr5 7200mhz cl34 from Corsair (dom platties) I get the Failed Mem OC when XMP is enabled (only have 1 xmp choice) I have managed to get it stable with increasing voltages to 1.5 (which I just feel is too high for its xmp but not sure if it is) I assume with that voltage I should be able to hit higher frequencies...so after adjusting voltages for SA the dram the vddq 1 and 2 I get stable-ish results. I can run benchmarks and even some games for a while then it will blue screen. I have everything just clocked to 6800mhz right now. I know the percieved difference from 6800 to 7200 is insanely unnoticable I just want what I paid for....All this aside is it better to have 64gb (all four dimms populated) at 6800mhz or would it be better for me to remove 2 and run xmp which works obviously. I do a lot of gaming then little bit of streaming multimedia rendering etc. not too much production mainly gaming. Thanks in advance. I also apologize if this is the wrong place I am new here. Hope to converse with someone soon. Thanks.
 
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Hi
Well it much depends if you really will use 64GB of RAM you have. If yes, stick to lower frequencies. Difference between 6800 and 7200 is negligible, other than shown in some synthetic benchmarks.
Else remove 2 sticks and get as high frequencies as you can get.
 
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DerMoo160b02ec said:
All this aside is it better to have 64gb (all four dimms populated) at 6800mhz or would it be better for me to remove 2 and run xmp which works obviously. I do a lot of gaming then little bit of streaming multimedia rendering etc. not too much production mainly gaming.
Click to expand...

For your type of usage, running four modules for 64 GB does not have any advantages, only disadvantages. I would stick to (literally) two sticks in slot A2 and B2, that's the only way to get DDR5-7200 stable, it's very difficult to achieve with four modules.

64 GB total can be necessary for professional applications that are RAM-starved, but you'd know when you use one. Otherwise, and for gaming, you're only making things unnecessarily difficult, while providing zero benefit from that much RAM being available. It will just sit there, unused, slowing down your memory system. Games, they don't really need more than 16 GB (because even the best consoles only have 16 GB RAM), so 32 GB total is already more than plenty.
 
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As someone with a Z790 Ace, I'd stick to 2 sticks as well. Mine (in my sig below) run great at 7000 without any any adjustments at all.
As for the memory.....honestly, unless you're doing tons of loads that require memory (like the rendering, etc....), then I'd stick with 64GB. But if you're mainly gaming, 32GB is more than enough.
 
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troykkem156c02e2 said:
Im curious now that with more memory support and with latest bios since this question was posted, is it possible to do 4x24gb of ddr5 7200?
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You need to understand that a BIOS update cannot make your CPU IMC faster.;)
7200 stable with 4 memory modules is not possible with any CPU and motherboard.
Talking about this particular motherboard and a CPU with close to perfect IMC (you won the lottery :biggrin:):
https://www.msi.com/Motherboard/MEG-Z790-ACE/Specification
• 1DPC 1R Max speed up to 7800+ MHz
• 1DPC 2R Max speed up to 6600+ MHz
• 2DPC 1R Max speed up to 6400+ MHz
• 2DPC 2R Max speed up to 5600+ MHz
 
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RemusM said:
You need to understand that a BIOS update cannot make your CPU IMC faster.;)
7200 stable with 4 memory modules is not possible with any CPU and motherboard.
Talking about this particular motherboard and a CPU with close to perfect IMC (you won the lottery :biggrin:):
https://www.msi.com/Motherboard/MEG-Z790-ACE/Specification
• 1DPC 1R Max speed up to 7800+ MHz
• 1DPC 2R Max speed up to 6600+ MHz
• 2DPC 1R Max speed up to 6400+ MHz
• 2DPC 2R Max speed up to 5600+ MHz
Click to expand...
I get it. But the specs doesn't say anything either about 4x16@ 6800mhz, which worked perfectly on my board at the advertised speed. I see a lot of post stating their aren't much difference between 6800 and 7200. If so, could the problem be the amount of mem per module, i.e, 4x16 and 4x24. Incidentally, the specs doesn't cover memory restrictions either, only advertised speeds. The QVL has some better info of tested ram amount and speeds for this board, but it doesnt cover 4x16 @6800 which worked flawlessly for me. I'm just trying to learn how this works and make sense of it all. Thanks for all your support by the way.
 
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troykkem156c02e2 said:
I get it. But the specs doesn't say anything either about 4x16@ 6800mhz, which worked perfectly on my board at the advertised speed. I see a lot of post stating their aren't much difference between 6800 and 7200. If so, could the problem be the amount of mem per module, i.e, 4x16 and 4x24. Incidentally, the specs doesn't cover memory restrictions either, only advertised speeds. The QVL has some better info of tested ram amount and speeds for this board, but it doesnt cover 4x16 @6800 which worked flawlessly for me. I'm just trying to learn how this works and make sense of it all. Thanks for all your support by the way.
Click to expand...

As general rule: more memory you have, lower speed you can achieve. So 4x24GB is always slower than 4x16GB.
On the other hand, 4 memory modules at 6800-7200 require unhealthy voltages (1.45-1.50V) for both memory modules and CPU IMC.
Those voltages are not suitable for a 24/7 usage because your CPU gets damage and sooner or later it will fail.
And finally, with the latest forced voltage limitations made by both AMD and Intel in the past year, all these super-high speeds keeping the CPU stable are not possible anymore.
:beerchug:
 
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