I have been using this motherboard IS-7E for almost 1mth+, running P-IV2.4C,\nFX-5800, Hitachi 82.3GB SATA, WinXP Pro. Okay, I have 2 pairs of 256MB x 2\nwhich one pair of 2x256MB is a Kingston HyperX 3500 using winbond BH-5\nchips, and the other is 2x256MB is a Cosair using Winbond BH-5 too,\nactually, I purposely seek high & low for these similarly chipset based\ndimms, even right till it's using the same PCB dual sided layout as my\nHyperX. Both are able to clocked at Cas-2-2-2-5 at v-dimm voltage 2.8v. But\nI wish to know is when I try to place all this 4 sticks of dimms into my 4\ndimms slot, my motherboard will not boot up, therefore, switching either\npairs around will also not result in any posting, plus I'm using default\nDDR400 settings all at its minimal default so that I know whether its my ram\nor etc is causing any inability to boot. Then if I simply place any of the 2\nbrands running Dual Channel, into dimm1 and dimm3, it will allow me to post\nw/o problems, so is it conclusive to say that maybe, my board dimm2 & dimm4\nis faulty? cos' it seem like not able to allow my Cosair to even solely\noccupied them to boot up except only allowing my HyperX? very weird right,\nbtw, both brands of dimm is able to boot up in dimm1 & dimm3 running Dual\nChannel. Thus, anyone has encountered such issue? or can I RMA my board due\nto not allowing me to fully load up with all four dimms inserted? My board\nis updated to latest bios revision 18 and it's version 1.1 model.\n\nThank you.