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Maxing out LGA 1700 RAM capacity - what frequency to expect?

B

BoggledBeagle

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May 24, 2023
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I tried using two 96 GB RAM kits (Kingston KF560C32RSK2-96), thus maxing out the memory spec of my CPU (13900KS) of 192 GB.

At 6000 MHz CL32 it almost immediatelly bluescreened in Windows.

At 5600 CL40 it seemed to work fine, but it failed in Windows RAM test.

Finaly it passed Windows RAM test at 4800 MHz CL38.

With four 48GB sticks and ordinary motherboard I did not expect any miracles, but is 4800 MHz really all you can get in such setup?
 
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Can probably consider yourself lucky you got that out of it with that much system memory. Provided you have a use for that amount of memory trading some MT's seems pretty reasonable. That said I don't have any idea what you've got planned for 192GB of memory.
 
I have no plan for that at this moment, I just happened to have two kits and put them in the motherboard to see what happens, honestly I expected that it could work at 5600 MHz. Now I checked again the spec of the cpu:

13900ks ram spec.png

and it says just "any RAM kit is not guaranteed to run quicker than 5600 MT/s", which is useless information really.
 
BoggledBeagle said:
I have no plan for that at this moment, I just happened to have two kits and put them in the motherboard to see what happens, honestly I expected that it could work at 5600 MHz. Now I checked again the spec of the cpu:

View attachment 365898
and it says just "any RAM kit is not guaranteed to run quicker than 5600 MT/s", which is useless information really.
Click to expand...
same as AMD Ryzen, but AMD seems to be more "fair" specifiyng that if you will max out channels, the freq could be even lower than "rated max". :)
 
I am not planning to find the maximal stable frequency, but if I wanted to test one or two more frequencies, is there any way how to speed up the testing? At this capacity even the Windows test ran 3 or 4 hours.
 
If you want to somewhat quickly test instability I'd recommend the moving inversions tests. Those seem to be pretty hard on memory stability. I think officially 4 DIMM SR or DR is something like 4000MT/s or 4400MT/s for Intel with RL. It's a bit lower for 4 DIMM and DR.
 
You probably need to fiddle with resistance values. Video below is for AM5 but I imagine Intel side isn't much different.

 
4x dual-rank rank will top out around 5600 if your lucky. Officially from Intel it is much lower.
 
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Do DDR kits ever come with XMP (or EXPO) profiles for 2 dimms per channel? What if you buy a quad dimm kit?
 
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