Core i7 Vdimm/VTT Graveyard :D

[Amurtigress]

qpi voltage is vtt, it actually has nothning to do with qpi, its powering the uncore of the cpu, the l3 cache and imc... so yes, if you use a lot of mem at high clocks or tight timings you need to push the uncore voltage up so the imc can run stable... ioh is the northrbidge, the x58 chipset, increasing ioh 1.1v results in higher and higher stable bclocks, its not related to memory directly.

so what exactly is your problem? getting mem clocks up?

I can only repeat myself:

I am running my i7 920 at 19x200 and either DDR3-RAM clock 1200 or 1600. My memory is 4 pcs./2 sets Corsair TW3X2G1600C9DHX modules that I bought in fall 2008 with the perspective of using them on my future Nehalem system. Memory sockets A1, A2, B2, C2 are populated according to Intel's specs.

My modules are working fine at 1200/7-7-7-20, 1.5V.

However, 1600 is a bit of a different story.

1600/9-9-9-24/1.8Vdimm and 1.35-1.5V QPI/uncore leads to random sudden reboots of my system without a bluescreen.

I am not getting any errors in LinX, no errors or failing worker threads in Prime 95 x64, and no errors in Memtest 86 plus V2.11 either. The temperature of the cores and chipsets are the same no matter if I am running 1200 or 1600 memclock.

I can certainly post a filled out template for my P6T Deluxe V2 board if neccesary.

PS: A quick thought, isn't it better to rather use the module in socket A1 in C1? I know A1 is the correct configuration, however, poulating C1 instead would make sure to have the on die termination for the black sockets at the end of the board's traces.