GTX 460 on my computer?

[cod4fun]

hey guys. I am planning to upgrade my video card to the nVidia GTX 460. I currently own this config :
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01715983&cc=us&dlc=en&lc=en&jumpid=reg_R1002_USEN

I need to know:

1-If I have enough space (see links)
Rear view: http://img547.imageshack.us/img547/596/hprear.jpg
PCI slot : http://img137.imageshack.us/img137/5696/hpinside.jpg
GAINWARD GTX 460 front view: http://i2.cdscdn.com/pdt2/2/G/B/4/300x300/GAINWARD4602GB.jpg

2-Whether I'll need to buy a power supply, a fan, or anything else?

Thank you!

 

[NullStrikes]

I have the same mobo, upgraded to a gtx 460 about a week ago.

1. you'll have space, but it will be a really tight fit. You might have to remove one of the pci cards
2. 300W is weak, you should probably get something in the 500W range. I got the 1GB cyclone from msi, it runs idle ~30c and peaks at about 70 under load