Re: Upgrading processor from Pentium D, where to go?
You could upgrade to a C2D like an e6600, which is under $100 and keep everything, and get a cooler to overclock it. You can't use the better 45nm quads on that board.
Your 9800gtx+ is still being made... well a minor change, as the gts250.
It all depends on your cash. You can upgrade through the amd route with a mobo and cpu, and keep the ddr2, or go ddr3. But to go to a new intel, you'll need ddr3 for sure.
Or cheapest is to pop in a better c2d, which will beat out the pentium D.
Foldie = i7 950@ 4.0Ghz Gigabyte x58a-ud3r EVGA 970 SC Corsair H100 Corsair hx520 3x2gb OCZ Gold Corsair 650D
Woohoo = L5639 @3.1Ghz EVGA SR-2 gtx 260-216 Hyper 212+ Corsair 1050hx 6x2gb Corsair XMS3 Blackhawk Ulra
Alienware 18 - SLI 770M 4700mq 16Gig