4890 power requirment

[Atomic88]

I've been searching and have gotten kind of confused on exactly what I need power supply wise in order to power a 4890. My current power suppy is a Silverstone st75f. It states that it has four 12v rails each with 18a. The pci-express connectors are on either the third or fourth rail. If on the third rail, it shares with the main 24pin atx, if on the fourth rail it shares with molex and sata. I've currently got six fans running molex, three devices on sata. Would this power supply be sufficient in powering the 4890 and if so which rail (three or four) would you guys suggest? Thanks in advance.

 

[gkay09]

^ That PSU is just fine and is of high quality...
Actually it has enough power even for 2x HD 4890 crossfire...
If am not wrong, you wont have to worry about the rails...Just connect the 2x PCIe 6-pin connectors in the specified socket and you are done...
http://www.newegg.com/Product/ShowImage.aspx?CurImage=17-256-009-10.jpg&Image=17-256-009-02.jpg%2c17-256-009-03.jpg%2c17-256-009-10.jpg%2c17-256-009-04.jpg%2c17-256-009-05.jpg%2c17-256-009-06.jpg%2c17-256-009-07.jpg%2c17-256-009-08.jpg%2c17-256-009-09.jpg&S7ImageFlag=0&WaterMark=1&Item=N82E16817256009&Depa=1&Description=SILVERSTONE%20ST75F%20750W%20Power%20Supply

 

[Duesouth]

this power supply of yours is perfect.
http://www.silverstonetek.com/products/p_contents.php?pno=st75f
it is plenty for it. do not be worried about it.

very nice power supply.

 

[sexybate]

I've got the Saphhire 4890 in a Phenom 2 X4 with 3gb Ram... and am quiet upset with the performance so far.

I've seen the graphs of the card and it was lyk 48 fps on 1680x1050 in crysis.
http://www.tomshardware.com/reviews/radeon-hd-4890,2262-7.html

And I barely get 21 fps. noAA 1680x1050 all settings very high. damn. can some one help me with this please.

Is there something to do with my PSU? Coz It's a cheap one frm china i guess 500W. bought for 35$.. Is that the problem for getting low performance...