well generally depending on the make of the psu, you should be looking for at the least 22amp on the +12v rail. However it is highly recommended that you save yourself some trouble and go for something with 28-30 amps.
Make sure its a good make as some crap psu's are 500-600 watts overall but only have 12amps on the +12 rail. You should be looking for about 500 watts with 28-30 amps on the psu.
The thing is my system is about 1.5 years old and obviously running a agp port it came with a 9800 i upgraded it to a x800xl after a couple of months.
That died recently and i noticed the 1950 but alas i have chacked and have a 400 watt supply so dont think i can run it any ideas to get a bit more life out of the system before i bite the bullet and upgrade.
Thanks
Mactronix
well my psu is a 380 watt and i run the card without any problems. However, I may just be on the border line.
What you could do, is to go for a card like the 7600 gt or the x1650 pro. They consume less power and will give you enough boost to last you a little while longer.
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