PSU information needed!

April 4, 2011 at 17:27:41
Specs: Windows 7 ultimate 64bit, Core i3 (OC 4.08Ghz) - 4GB DDR3
I currently have a 650w power supply with one 5850; i want to purchase another and run them in crossfire but will my PSU hold out?

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April 4, 2011 at 19:07:04
You need to post the exact model of your power supply in order to get a meaningful answer. Below is a link to chart showing the power consumption of some current cards. The 5850 draws 163W, which equates to about 13.5A on the 12V rail.

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April 4, 2011 at 19:17:21
HIGHPOWER 650W ATX (Search Google its got green writing on the box saying '650'), not sure of the 'model' number. On the box it says it supports SLI and Crossfire but 5850 draws more power than other cards!

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April 4, 2011 at 19:28:57
Below is a link to the only 650W I found from that brand. The power supply has 2-12V rails. Each supplying 25A. One rail will feed the board and CPU. The other, the graphics cards and all the other 12V hardware like drives and fans.

Two 5850 cards draw 27A by themselves, leaving nothing for the other hardware. IMO, that PSU isn't going to work with a pair of 5850s.

What motherboard are you using? Can you even run Crossfire?

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Related Solutions

April 5, 2011 at 02:44:56 That is the PSU I have. On there website it says it has quad 12v rails? Looks like I will a new PSU as-well for that upgrade i wanted!

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April 5, 2011 at 06:01:12
That unit has dual 12V rails "Dual +12V rails (+v1 v2)". However, they are only 20A each, which is even worse.

You need to go by more than just the rated wattage. If you look at their own specs it doesn't add up.

Get a brand name SINGLE 12V rail unit. Post back in a new thread with models you have picked. Look at and read the reviews.

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