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Crossfire with a XFX HD 7870 Ghz edition. Will this set up work?

Last response: in Graphics & Displays
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August 28, 2013 8:34:16 AM

Good morning Tom'sHardware,

First of all, I'm a brand new member and I can't believe it took me this long to sign up since it was with the help of this site that i was able to built a computer :D  .

I just build my first computer and I would like to ask you all a question. My apologies in advance if this is not the correct way/place for it.

I would like to Crossfire with 2 hd7870. My question is:
Will I be able to Crossfire with my current set up if I buy a PCI molex adaptor like this one for my PSU:

http://www.ebay.com/itm/14-8-6-2-Molex-4Pin-Convert-to-...

Here is my built:
Processor: I5 4670k
GPU: XFX hd 7870 Ghz edition
MOBO:Asrock Z87 Extreme4
PSU: Corsair Builder CX 600W 80Plus Bronze
Ram: Corsair XMS3 8gigs

http://pcpartpicker.com/p/1xe4H

If not what is a good reliable PSU I could buy taking into account a $50-$70 buget? I'm not OCign anything.
Any direction or advise would be greatly appriciated!

Thank you once again.

Best solution

August 28, 2013 8:52:11 AM

The power requirement to CF two HD7870s is as follows:

600W power supply (or greater) with four 75W 6-pin PCI Express power connectors recommended for AMD CrossFireâ„¢ technology.

NOTE: Minimum recommended system power supply wattage is based on the specific graphics card and the typical power requirements of other system components. Your system may require more or less power. OEM and other pre-assembled PCs may have different power requirements.

http://www.amd.com/us/products/desktop/graphics/7000/78...

Those adapters should work with your current PSU. However, you have a pretty decent rig and you are on the edge with the PSU you have.

I would suggest you consider replacing for PSU for long-term reliability and use. One like this one:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I normally recommend Seasonic and Corsair PSUs, but this is a decent PSU for a very good price. Just trying to give you some headroom with your power needs, but your current PSU should work with the appropriate adapters (just to be clear).
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August 28, 2013 9:26:54 AM

Agree^ given your budget that Thermaltake should work just fine although it would not be my first choose either. Other than the PSU it looks like you have a nice rig there. Not that the PSU you picked is bad just not quite enough to Crossfire those two cards.
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August 28, 2013 9:59:50 AM

Hello,

Wow, thank you so much for the quick response! I really appriciate both you guys input and suggestions.
So, to recap, a better PSU is prefferable but I should be ok with the one i have to crossfire until a purchase a better one.

Also, If I may ask another question; does it matter what brand of GPU to buy as long it is a HD7870? does it matter if it is a ghz edition?

Kind regards
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August 28, 2013 10:02:17 AM

The GPUs need to be from the same family. Don't try to mix a vanilla HD7870 with a HD 7870 XT (they use different processors).

For best results, matching GPUs are preferred.

What specific models are you considering?
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August 28, 2013 10:49:08 AM

I would go for 2 of the Sapphires. I use Sapphire GPUs often and have been very happy with them. The price is good as well.
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August 29, 2013 6:04:28 AM

Hello,

I Just wanted to say thank you for your guys help in this particular subect! You both were great and thoughtfull!
COLgeek I have picked your answer as the solution =D

Kind regards
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!