Guys, I gather that some (all?) of the P35C DS3R boards overvolt the RAM, so if it's set to e.g. 1.8V in the BIOS it will actually supply e.g 2.0V or whatever. This is second hand information that I've not been able to verify but, that's what is alledgedly the case. Now, this would fit in with yantorsen's experience so far - his RAM working at its proper voltage (in his mates rig) but not liking to be overvolted (accidentally, in his own rig), some/many RAM sticks are as bad when overvolted as when undervolted. I have a feeling if he tries some RAM that can take e.g. 2.0-2.2V, it'll probably work fine at stock settings in his board (with the slight overvolt from stock 1.8V or whatever.) That said, this is all theory. If I go and see this problem rig next Saturday I'll test this theory by trying some more voltage lenient RAM. We shall see...