This message keeps coming up when I first power on my PC. Spec: KN1 SLI mobo, AMD 64 3500+ processor, 4 * 1 GB DDR 400MHz and twin 256mb graphics cards. Other issues that may be related: As the machine boots up, it reports that it has only 2.8 GB of RAM, and this is confirmed by windows XT. I have swapped the Gig-sticks around trying different configurations of 1, 2,3,4 of them in different slots and I can confirm each slot works and each stick works but whereas 2 sticks gives 2 GB of R A M, 3 sticks always gives 2.8 GB and 4 sticks does not improve on that. Running check-it diagnostics program, this reports back that the memory allocatio fails the test. I have tried to change CPU frequency but have to admit I am new to this game and cm unsure of the AMD Frequency to RAM frequency ratio I should use and how best to change it. Would be very grateful for some HELP!