Rampage Formula won't POST with 8Gib

Here's an odd little situation... I've just upgraded my P5B Deluxe Wifi to an Asus Rampage Formula, and thrown in a second HD4870 in Crossfire for good measure. Everything else about the system is *exactly* as it was in the P5B however I find that this board won't pass POST with all 8Gib of RAM installed.

RAM is Corsair CM2X2048-6400C4DHX (that'd be 4 of those). I've manually set voltage in the BIOS to 2.10V, and the timings to 4-4-4-12, but the machine won't POST until I take 2 of the modules out. I've upgraded to the latest BIOS, no dice.

Any thoughts?

Might need to bump the MCH voltage up a bit.

Hmm... after switching modules around a bit and bumping NB volts I got it to POST with 6Gib. I've since dropped the NB back to standard volts and it posts fine, but as soon as I put the last module in it refuses to pass "check DRAM".

I've had the NB as high as 1.39V, I'd rather not push it any further unless absolutely necessary...

Any other ideas? All 8 Gib worked at standard in my P5B Deluxe.

weird as I have the same Mobo as you and I have just put 8gb in mine which it was very happy to accept.

4gb of dominator and 4gb of reeper (bros)

Everything is at stock at the moment. I will let you know what settings I have the RAM later as I know I had to change those when I first installed windows.

It seems that DIMM_B1 is guffed - have tried 8 known good memory modules in it now and it fails to POST whenevr that slot is occupied :(

Gah!

Clutching at straws:
Does the manual say the M/B will work with just ram in that socket - if so can you try that?
there isn\'t dust or fluff in the ram socket?

The board boots with RAM in any slot but that one, that includes if only a single module is used. I\'ve blown the slot with a can of air, but no dice.

Unless I\'m missing anything obvious I guess I now have to decide if I can live without this rig for long enough to get it RMAd to Scan, or if I just suck it up :(

Quote:

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Originally Posted by Splash

Unless I'm missing anything obvious I guess I now have to decide if I can live without this rig for long enough to get it RMAd to Scan, or if I just suck it up :(

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Send it back, its faulty and it may well get worse.