I'd get something under 200 from this list and be happy -> http://www.tomshardware.com/reviews/geforce-gtx-radeon,2151.html
Why under 200? Because what I see there is on par with the power consumed by the 7300 series.
I wondering which card will work with my system the best?
I got a HP Pavilion Media Center PC m7674n
You can see product specifications http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00787409&lc=en&dlc=en&cc=us&product=3271566&lang=en
Somebody told me that I need to change my power supply and then the card but Which card?
Please tell me the best option for best performance. Thanks.