Sony would have to issue a BIOS to id and support the Core 2 Duo. For now your best payoff is a better video card.
I can assure you the i945g does not support the Quad Core CPU.
hey guys ive got the sony vaio vgc rb 52 desktop..bought it shortly after it came out..right now i have the pentium d 820 chip but im looking to upgrade to the core 2 duo..or even core 2 quad if possible. but i cant find anywhere if my motherboard supports it. any ideas if it will?