So... I'm thinking of getting a ASUS Geforce 9800GT 1GB DDR3 256bit PCI-E but I have only a 450W power supply.

So my first question is if I have enough power for the gfx card... I tried 2 different power supply calculators and one says that I have the needed power and the second one says that I dont.

My system curently is:
Mainboard: Biostar NF520-A2 SE
CPU: AMD Athlon 64 X2 Dual Core 5000+ 2.6GHz
RAM: 2x2GB DDR2-800 400MHz
HDD: SAMSUNG HD642JJ 640GB SATA2 7200rpm 16MB
VC: GeForce 8500GT 512MB
1xDVD-Multi Recorder
1xPCI Lan card Realtek

If I cant run the 9800GT with my current PSU I could get a EliteGroup 9800GT 512MB DDR3 256bit PCI-E and manage to get a 500W PSU.

I could also try to get a ATI card (if they are cheaper but I dont think that they are) but I need to know if having a nVidia chipset is going to be a problem for the card...

So any help will be appreciated.

I personnaly would get another PSU I used those calculators and my system was only comming up a 306 then 400 and then 496 with diffrent ones and then my system kept of turning off because the system didnt have enough juice these are my specs:

barracuda 1tb HD 7200rpm I think
GTX260 GAINWARD GOLDEN SAMPLE
THERMALTAKE AUMOR LCS CASE 5 FANS INSIDE
M4NE MOTHERBOARD
3GB KINSTONE RAM 800MHZ\
WINDOWS XP
7850 dual core amd processor

I ran this on a 500 watt PSU and I just kept failing upgraded the PSU to 750watt and no problems very stable

thanks dom! I'm starting to get the picture....

I need more money!!!!