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Power to Overclock 3870's in crossfire

Last response: in Overclocking
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November 27, 2007 4:37:37 PM

Just a quick question for all you guru's out there. I have a Hiper 580W SLI/Crossfire compliant PSU. Now i realize when you overclock you use more watts per component o/c'ed.

Is there a way or does anyone know how to work out, how much power i really need to handle a 6000+ @ 3.4 bout (160w-180w i think, i used some sort of overclock watt checker however old it was :heink:  ) & getting two 3870's to (for the time being) the ATI Overdrive max at around 862MHz core?

I don't want to crack on, when i could face multiple problems all at once not just the normal artifact/hanging problems you get when o/c'ing your gfx card.

Thanks for reading, sorry if you think i'm being greedy trying to overclock this pair, but i think that any item i buy with my hard earned money should work at it's maximum capacity be it my motorbike, computer or missus :p .
November 27, 2007 6:56:00 PM

I'm surprised a 580W can even handle 2x 3870s?
November 27, 2007 8:47:03 PM

How dare you sir, mock my mighty 580 PSU :kaola:  . I'll have you know at one point i had 2x x1900xtx/xt running overclocked until the XT blew up. A mild temperature problem was the cause :sarcastic:  .

However this doesn't answer if i can overclock the 3870's without a PSU problem creeping up on me. Any more takers?
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November 27, 2007 9:13:41 PM

You can overclock but don't push too far. and BTW tomsreview says 3870 loaded with AOE III 1600x1200 takes 265 watts... 2x265 = 530? 580 total and according to yoou 160w-180w for the 6000+ so... boom? idk what else to say
November 27, 2007 9:27:17 PM

Sounds like a PSU upgrade is due fairly soon :( . Saying that those 1000w ones are getting reasonabley cheaper.

Well never mind, but thanks for the info on the 3870's load power usage :) .
November 28, 2007 1:58:58 PM

PS. to anyone who reads this wondering what PSU two 3870 in crossfire needs. It handles a 580W (as the ATI website says) but I've just today had to put my CPU @ stock speed to get it to boot, so it is compliant however get a branded 700W+ to be able to overclock your CPU and 3870's.

Well I guess we all live an learn :pfff:  .
August 7, 2008 2:46:46 PM

I have a xion 600 watt ps and have E8400 @4008 1.34 volts,one 320 hd,x48 dfi board,x-fi sound card,20x,dvd combo drive,and 2x3870 oc editions running 900/2500,and have had no problems.mos time run cards and default 800/1170.
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