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Questions regarding Crossfire and my PSU

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June 13, 2013 10:59:03 AM

Hello everyone!
I recently got another 7850 for my birthday to crossfire with my current one. My question is, do i need a more powerful PSU than my current one to use crossfire succesfully? Right now i dont think the 2nd card is being utilised at all, and im still getting the same fps i would with one 7850. My current PSU is an Silver Power-SP-SS500 500W.
June 13, 2013 11:05:29 AM

Yes. I don't know what the rest of your configuration is, but a typical i5 rig with those in crossfire needs around 575w psu. Haven't heard of Silver Power and would not trust it. I recommend a Seasonic 620w modular psu. Solid and a good value from newegg.com.
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June 13, 2013 11:06:43 AM

Im getting dreadful fps at the moment. 20 fps in BF3 @Ultra 1080p. What`s wrong?
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June 13, 2013 11:08:51 AM

@maestro0428

I`ve got an AMD FX4100 going at 3.7GHZ.

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June 13, 2013 11:10:08 AM

maestro0428 said:
Yes. I don't know what the rest of your configuration is, but a typical i5 rig with those in crossfire needs around 575w psu. Haven't heard of Silver Power and would not trust it. I recommend a Seasonic 620w modular psu. Solid and a good value from newegg.com.


SR-71 Blackbird said:
Silver Power-SP-SS500 500W < Very low quality PSU.


So...i definately need an upgrade then?

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June 13, 2013 11:11:36 AM

The quality alone would make me want to change it to protect and help the other components.
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June 13, 2013 11:14:33 AM

SR-71 Blackbird said:
The quality alone would make me want to change it to protect and help the other components.


Okay, thanks for the help guys. I´ll look into getting a new PSU. I`d love some recommendations. A good PSU for under 100$?
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June 13, 2013 11:16:55 AM

Is my current PSU restricting the other components?
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June 13, 2013 11:46:29 AM

I'd be comfortable running your CPU and GPUs on a 550W or greater QUALITY PSU.

For crossfire to work, your motherboard needs to be crossfire compatible, you have to attach the crossfire bridge, you have to enable crossfire in driver, and you have to run your games in fullscreen -- not windowed, and not fullscreen windowed. Also, you should install the Catalyst Application Profiles from AMD's driver site.
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June 13, 2013 11:54:58 AM

quantumcoke said:
SR-71 Blackbird said:
The quality alone would make me want to change it to protect and help the other components.


Okay, thanks for the help guys. I´ll look into getting a new PSU. I`d love some recommendations. A good PSU for under 100$?


hapkido said:
I'd be comfortable running your CPU and GPUs on a 550W or greater QUALITY PSU.

For crossfire to work, your motherboard needs to be crossfire compatible, you have to attach the crossfire bridge, you have to enable crossfire in driver, and you have to run your games in fullscreen -- not windowed, and not fullscreen windowed. Also, you should install the Catalyst Application Profiles from AMD's driver site.


Im not completely sure it`s CF compatible, i`ll have to look that up. The bridge is attached and CF is enabled in the driver, and i have been running my games in fullscreen. I have also installed the newest drivers and application profiles(although im not familiar with how they work). Should i be worried about bottlenecking? I`ve got an AMD FX4100 OC`d at 3,7GHz as i mentioned. Thanks for the help guys, im quite new in computer building.
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June 13, 2013 11:58:41 AM

10964635,0,276663 said:
If you need more help stop back.[/qu

Thanks alot.
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June 13, 2013 1:04:02 PM

What motherboard do you have? It's possible that the 2nd PCI/E slot is holding you back if it only supports 4x or less in crossfire mode.
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June 13, 2013 2:26:37 PM

clarkjd said:
What motherboard do you have? It's possible that the 2nd PCI/E slot is holding you back if it only supports 4x or less in crossfire mode.

I`ve got an GA-970-UD3. The 2nd PCI/E slot is actually only supporting 4x, so thats another problem. How much would it hold me back?
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June 13, 2013 4:24:35 PM

What do you guys request i do? Buy a new PSU or Motherboard or both? How big a difference would a new motherboard do?
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June 13, 2013 6:49:15 PM

The 4x lane might affect performance a little, but much of the communication between the cards is handled by the crossfire bridge.

You NEED a new PSU.
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June 14, 2013 4:13:04 AM

hapkido said:
The 4x lane might affect performance a little, but much of the communication between the cards is handled by the crossfire bridge.

You NEED a new PSU.


Phew. Thats a relief. Thought for a while here i would need a new motherboard aswell. Thanks alot dudes.
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