Needing Registered ECC memory advice

jdcranke07

Honorable
Hey Everyone,

I'm needing to get some registered ECC memory, about 64GB or more. My question is: Is it better to get 1333Mhz, 1600Mhz, or 1866Mhz for a server setup? I can't find anything saying that it really matters in terms of speed. However, I do know that UDIMM memory isn't really affected by speed unless you tune the timings tighter in faster UDIMM modules. Is this the same thought process for RDIMM and LRDIMM?

Also, as a side note. If my Asus Z9PE-D8 WS mobo says it can handle up to 256GB of Registered ECC memory in a general sense, does this apply to RDIMM and LRDIMM or just RDIMM? In either case, would I max this out by putting in 32GB sticks in each DIMM slot? Or is there something else I'm missing?
 
Solution
Pretty much , yes, overall ECC will be a bit slower than 'regular' DRAM of equal specs from the error chexking which is almost non-noticeable

jdcranke07

Honorable


Cool. So, just to clarify, does ECC memory act the same as Non-ECC in regards to the speed to CL ratio? Meaning, is there really a performance difference if you get 1866mhz with a CL of 11 vs 1600mhz with a CL of 9, hypothetically? I know that faster speed and lower CL is ideal; however, the faster speed can be countered by a higher CL in non-ECC memory. Which that effectively makes your DRAM the same, at least in terms of gaming. But, is this the same case for rendering and/or running VMs? Or is it just faster speed is better for throughput?