DFI UT X58-T3EH8 continued - Part 2

[Sam_oslo]

imho is not only RAM issues, I think these problems are related to CPU Integrated Memory Controller and QPI bus frequency.

Not all the CPU are abe to run with uncore > 3.6 GHz and/or QPI bus strongly overclocked: BCLK>190 MHz and then QPI bus >190x18=3420 MHz.

I agree, depending of the CPU-batch, the QPI bus can be the problem too, but that's relatively easy to diagnose/fix. On the other hand, many RAM-sticks can limit a good CPU-batch to run at BCLK210 (1680MHZ RAM). This is not so easy to diagnose and people are reporting some "strange" instability problems (it can pass the Memtest, LinX and PrimeBlend, but fails in SuperPI, or other "strange and unheard" problems).

It is not easy to generalize, but I believe many of these "strange" instability problems are rather related to "too high BCLK for the RAM" than for CPU/QPI/Uncroe (but I agree that this problem exists too). After "the dead of the hyper", there not many sticks in the marked that can run stable @1680MHZ (even with unsafe Vdimm).

An easy way to diagnose the QPI-problem can be to run LinX/PrimeBlend with QPI fast mode, disabled.