Hey all, im kinda new to all this computer building stuff but i built my own gaming computer not too long ago and im currently using a geforce 9600 gt on a crossfire motherboard and i was thinking of getting two AMD Radeon HD 4770 but im not sure if my current psu can handle it. i was just wondering what sized power supply i would need, im current using an acbel 510 watt but im not sure if it can handle running crossfire with those two cards.
Depending on the rest of your computer, your PSU might not suffice. I'd go with a 600W for 2x 4770s.
As xiz0r says, a single 4870/GTX260 would do you better for money. Crossfire does have scaling problems with some games too, so having a single "good" card will render those scaling problems invalid.
Looking on Pricespy.co.nz, it looks like you can get a 4890 1GB card for just under $400, or a GTX275 for slightly over $400, which is roughly the price of 2 4770s.
You may be better off with the HD 4870. Specs for the GTX 260 call for a 500W PSU and 36A on the +12V rail. Your Acebel 510W provides just 30a sustained/continuous on the combined +12V rails.
The GTX 260 may work just fine on your setup, but don't be surprised if it doesn't since your PSU is technically under spec for that card. The GTX 275 calls for a 40A +12V rail by the way and is likely out of reach of your current PSU. Good luck with whichever one you choose.
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Last edited by HonestJohn : 07-11-2009 at 07:22 PM.
nothing to add here. since the 4870's 1gb units have fallen in price like theres no tomorrow 4770's dont make anymore the bang the yhad a couple months back. i would be worried about that psu. try ocz 600w and up. cheap,durable.stable.
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add a couple 120mm fans overhead to drop temps by 10+ celsiusD.S.C-12(2)-
I got some good advice from the store for a gaming PSU the last time I went shoppin for a PSU. The guys at the store were helpful. They were very accurate in getting me a PSU that suits me, it can happen when talking to experienced technicians I trust enough. Oh, and I would stick with the PSU being overpowered to allow expansion with new parts and the PSU fan not being so loud because I prefer a computer that is quiet enough for me.
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Re: Want to run crossfire, not sure about psu
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