Can anyone tell me why ASUS P5NSLI would have a problem with 1GB DDR2 667MHz DESKTOP RAM PC2- 5300U 240PIN SDRAM? We bought 4 matching sticks from an Ebay special trying to get a little more memory in an old work PC. Maybe a BIOS setting needs changed? Its set to 6 7 7 7 currently from whoever last rebuilt this thing and 2X. Not sure what else might be the problem. TIA