X48 Rampage Formula Preview.

[sethk]

Quick question for the vets here - I'm using my Rampage formula with a Corsair 4GB (2x2GB) CAS4 DHX kit. It's specced for 4-4-4-12 (IIRC) @ 800Mhz @ 2.1v. I just can't get it stable at these settings. I tried (one at a time and then in combination) relaxing the timings (A LOT), lowered the speed to 667 (so that mem could run 1:1), increased the mem voltage slightly (to 2.2v) and it just won't get very far into the boot process (it posts fine).

Each stick is stable individually and passes Memtest, but I just can't get them working as a pair. I have them in slots 1 and 3 (counting the slots as 1-2-3-4) and using 2-4 doesn't work. I'm running bone stock at the moment in terms of other settings. I even tried a slight MCH voltage bump, but that didn't help.

Should I start playing with clock skews for each slot or should I take this as a sign that I'm not going to get very far with this kit?

CPU is a Q9450 in case that matters.