Tom's Hardware > Forum > Graphic & Displays > ATI > HD 4870 X2 PSU Requirements?
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ShrikeC145   04-05-2009 at 09:33:41 AM

Hi, have just bought a pretty decent gaming rig and I am experiencing problems with the graphics card, 3 times now when I boot up it has said "Error, Unable to overclock CPU" on the BIOS Screen, I am using Windows Vista and it is very Unstable especially when running Crysis Sandbox Editor. I think that this is a PSU related problem because even when I underclock the CPU it still experiences problems.. The computer is using two SATA II Hard drives, 6GB of DDR3 RAM and a 2.6Ghz i7 CPU. When I custom built it, I was told that a 650Watt PSU was adequate and that 1000-1500W was overkill. I somehow doubt that.

Could you please tell me what the problem could possibly be, and if it is the PSU, what Wattage PSU would you recommend?

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cjl   04-05-2009 at 10:19:36 AM
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650 is adequate, but only if it is an extremely good quality 650. All 650s are not equal. Which 650 do you have?

 

For that rig, honestly though, I'd go with something like this:

 

http://www.newegg.com/Product/Prod [...] sair%20750

 

That is, unless you plan to crossfire, and add a second 4870x2 in the future. In that case, get this:
http://www.newegg.com/Product/Prod [...] r%20hx1000

 

I'm running that second PSU with 12 gigs of RAM, a highly overclocked i7, and a pair of 4870x2s, and it is absolutely rock solid. It is definitely a great power supply.


Message edited by cjl on 04-05-2009 at 08:04:49 PM
------------------------------ Asus P6T deluxe
i7 965 @ 4.2GHz (200*21), 1.384V
12GB Corsair Dominator DDR3-1600 CAS 7
 Reply to cjl
strangestranger   04-05-2009 at 11:26:44 AM
- 0 +

What PSU do you have just now?

Oh and my one is in my sig.

------------------------------ I'm a git, deal with it.

Antec 1200,PC Power & Cooling 750,Gigabyte DS4-x48,Intel Q9550@3.4 W/Xigmatek S1283,8GB OCZ DDR2 800,ATI 4870X2,X-FI>CA 640C amp>Tannoy R300/Senn 595's
 Reply to strangestranger
zipzoomflyhigh   04-05-2009 at 05:07:09 PM
- 0 +

How can we tell you if your power supply is adequate when you fail to even tell us what power supply you have?
a 650w cheap power supply is equal to a 500w power supply, while a quality 650w psu is equal to a 800w cheap power supply.

------------------------------ P965/Q6700@3.2 8MB HD4850 OC Edition
4GB Corsair XMS 800
Vista64/Win7
Fatality 550w/Antec 300
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