My X58 Sli Evga has this problem I am going to buy a new chip. The first 3 slots out from the chip don't work at all. I tried two different sets of memory chips. the bottom three slots work fine but give only dual channel. slots 3,5,6 work fine but 1,2,4 are dead. I have 6 GB of Mushkin Redline in slots 3,5,6.
Thanks fore the thread