Sign in with
Sign up | Sign in
Your question
Solved

Necessary PSU wattage for 3-way Crossfire?

Tags:
  • Power Supplies
  • Crossfire
  • Components
Last response: in Components
Share
November 25, 2013 9:26:22 PM

I am currently running a dual Crossfire setup with HD6950s. A friend of mine broke up an old build of his and offered his HD6950 to me for cheap, and I was wondering what a safe wattage PSU would be if I wanted to snag it and try for a 3-way Crossfire setup.

My system:
i7-2600k (stock)
2x HD6950 2GB
ASRock P67 Extreme4 Gen3 mobo
2x 4GB DDR3 RAM
3x 7200RPM HDD, 1x SSD
running on a Corsair AX750W PSU

Calculating on eXtreme, I get a recommended wattage of 706W (without capacitor aging taken into account) and I figure that this 2.5-year-old 750W PSU might not be up to the task. This isn't something I am set on doing, either, since buying the card and upgrading my PSU would probably be more troublesome than waiting a while and just buying a solid new GPU; my current setup lets me play whatever I want at high enough settings that I'm happy. But I am, regardless, interested in what it would take. Thanks for reading!

More about : psu wattage crossfire

a b ) Power supply
November 26, 2013 1:16:09 AM

your 3rd card would run only at pcie express 2.0 4x and it would be bottleneck for it anyway , and in 3 way crossfire you will not gain to much of a performance boost anyway , another concern is your power supply which is high quality but power consumtion in load would be to much for it in terms of everyday usage...
3 way CF from older cards is just bad solution in general...

sell your cards , get single gtx780Ti and overclock your cpu , you will be able to run everything on max. settings smoothly ...

http://www.game-debate.com/gpu/index.php?gid=1920&gid2=...
m
0
l

Best solution

a c 311 ) Power supply
November 26, 2013 10:22:34 AM

samsquamsch said:
I am currently running a dual Crossfire setup with HD6950s. A friend of mine broke up an old build of his and offered his HD6950 to me for cheap, and I was wondering what a safe wattage PSU would be if I wanted to snag it and try for a 3-way Crossfire setup.

My system:
i7-2600k (stock)
2x HD6950 2GB
ASRock P67 Extreme4 Gen3 mobo
2x 4GB DDR3 RAM
3x 7200RPM HDD, 1x SSD
running on a Corsair AX750W PSU

Calculating on eXtreme, I get a recommended wattage of 706W (without capacitor aging taken into account) and I figure that this 2.5-year-old 750W PSU might not be up to the task. This isn't something I am set on doing, either, since buying the card and upgrading my PSU would probably be more troublesome than waiting a while and just buying a solid new GPU; my current setup lets me play whatever I want at high enough settings that I'm happy. But I am, regardless, interested in what it would take. Thanks for reading!


Hi - In answer to your question, 875w is recommended(by realhardtechx) for a system with 3x6950's. So, a high quality 850w PSU that has close to it's total power avail in +12v amps, and the necessary 6 pcie connectors would more than suffice.

Whether that's worthwhile or not, I think dark-globe is correct.
A lot more heat generated for not much of a performance gain.

BTW, you have one of very few 750w units (62 +12v amps) that might be capable of running 3x6950's.

Share
November 27, 2013 12:03:14 PM

Thanks to both of you! I was more curious if I could handle it than anything. I don't want to push my PSU to the limit, and I can handle most everything I want with two cards right now. I'll upgrade to a single more powerful card later on down the road when games get even more demanding.
m
0
l
!