I thought because the D945GCNL and the D945PSN both had the a 945 chipset and both had an FSB1066 and one of them was compatible with a Core Duo processor then surely the other would be compatible but it seems my guessing is wrong.
I found different compatible processors available for both the two motherboards.
...so there is no need for a follow up on this question, thank you.
EDITED: I did not look long enough before I posted.
I found here http://www.intel.com/products/desktop/chipsets/945p/945p-overview.htm the D945PSN motherboard ahs a 945P chipset and so is compatible with some Intel® Core™2 Duo processors.
Am I wrong about this?
Going by the poster in the link in my first post I may be correct.
Message was edited by: Nicholas Baker