I just purchased a Asus P6T MOBO, an i& 920, and a 6G Kingston memory kit (3x2), I can only get the BIOS to recognise available memory as 4087. The board specs state to populate A1, B1, and C1. It appears that A1 is not being recognized. I have tried all combination of chip placements, and same result so I am confident the memory is OK. I have seen numerous posts on various boards about this problem - there appear to be some 'fixes', but I have not found one the is clearly solving mine. Some claim a bent processor pin. Others, it is some other 'reason'. But I none so far fix my problem. I am considering retruning the MOBO and going with a different vendor. I am really at a loss as to what to do next.
In my case, it turned out that the memory was not compatable with the ASUS mobo.
I installed the processor and the same memory and my i940 processor onto a new Intel DX58SO MOBO and everything worked great.
Good luck on your problem.