Well it seems better than the 754 socket board i was using. The only other board i could of gone for really was the Abit 939 version which uses the same chipset to my old board, which is the K8T800. Even though i am using the same cables and connectors i have found an extremely large increase in windows boot up time - it might be the SATA controller for this board. My only dislike again is with the temerpature read outs. I've flashed the bios with several bios versions. All but the latest just report 40 for the cpu temp - this is stuck at 40 doesnt budge with load or anything. The latest however doesnt report 40 but reports -100 (or 156 in bios which i reckon is 256 - 100, basic integer stuff), but still the reading doesnt budge. The case temp on the otherhand in bios reports fine. but not for MBM - i wonder if its to do with the config as they now have that lovely motherboard selection built into MBM - i might of selected the wrong neo! the case temp in windows reports 20/21 bios telling me its in the 30's - which is accurate as hdd temps are in their 30's.
I think the thing you should try with your system is to get hold of another PSU to try 1st - cheaper than a different GFX i'd guess(?) or maybe a cheap pci card....