I recently bought the following items:- DFI LanParty NF4 SLI-DR (Socket 939) PCI-Express Motherboard AMD Athlon 64 3800 Venice 90nm Corsair 1GB DDR XMS4400 TwinX (2x512MB) CAS2.5 HIS Excalibur ATI Radeon X800 XL ICEQII TURBO 256MB DDR3 TV-Out/DVI But I`m having problems getting the mobo to work in Dual channel. I put it all together as instructed by the manual (memory sticks in slots 2 and 4) and my windows refused to start, almost gets there but then my pc restarts. No problem, I thought, just some conflict in my old/new motherboard drivers. Format and start again. Then windows setup refused to start, giving me IRQL_NOT EQUALL blah, blah, blah. Hmmmmm I thought, bugger! I`ve now got a memory stick in slots 1 and 2 and it starts up but after the post screen in keeps asking me to but the memory in 2 and 4 for dual channel! My memory is also only running at 333 and not the standard 400MHz, which is what the board reverts to in this setup. I`m after any advice as to what is going on, has anybody had this, and what to do about it. Thanks in advance.