Gowt1ham said:
Its recommended to have at least 32 amps on 12v rail for HD 4870 and higher.
Where did you see that ?? AMD's numbers are generally too low.
For a high end system, a minimum of 550W/approx 40Amps on 12V is recommended.
But for a 620,he may be able to get it to run fine.
ocizer said:
3.5k max
can gp 650w handle 2x hd4890
I find it funny, ppl with enough cash for 2 4890s can spend more on PSUs.
anyways, answer is a big NO. You need need at least 700W as minimum recommend is 750W (again, these are not numbers given by AMD). On a 650W you will be running it on its borderline.