Hi,
I'm currently thinking about upgrading my whole hardware, as I'm still running a motherboard with AGP an an old AMD 3000+ CPU.

My question now is:
What is better, an Intel Core 2 Duo or an Intel Core 2 Quad?
I mean does today's software use a Quad Core CPU efficiently?

The configuration I think about getting (shouldn't be too expensive):
Mainboard: ASUS P5K/EPU (socket 775, max 1600 Mhz FSB)
CPU: Intel Core 2 Quad Q6600 (4x 2400 Mhz)
compatible Ram (2 Gig in 2x 1 Gig sticks, as I'm still running XP)
Graphics card: ATI Radeon HD4850 512MB Sapphire PCI-Express
Power Supply: a 500 W should be enough?

thanks for any hints regarding this configuration and any advice, as I'm not into hardware stuff that much.

Thanks in advance!
xarthor