The pentium D isn't actually an Intel Dual core like the E8400.
My specs right now are:
Q6600 2.4 mhz, Asus P5KPL-CM m/b, 4 gig DDR2-8500 1066 ram, GTX 260 core 216, X-fi gamer sound card, 650 PSU.
Hey, since your video is PCI, your box would be even cheaper. A new CPU and mainboard might do it? What type of PSU and memory have you got?
Your CPU is what's going to really hold you back.