Questions regarding Crossfire and my PSU

quantumcoke · Jun 13, 2013

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.

maestro0428 · Jun 13, 2013

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.

quantumcoke · Jun 13, 2013

Im getting dreadful fps at the moment. 20 fps in BF3 @Ultra 1080p. What`s wrong?

quantumcoke · Jun 13, 2013

@maestro0428

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

Dark Lord of Tech · Jun 13, 2013

Silver Power-SP-SS500 500W < Very low quality PSU.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151088

SeaSonic X Series X650 Gold ((SS-650KM Active PFC F3)) 650W ATX12V V2.3/EPS 12V V2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply

quantumcoke · Jun 13, 2013

maestro0428 :

So...i definately need an upgrade then?

Dark Lord of Tech · Jun 13, 2013

The quality alone would make me want to change it to protect and help the other components.

quantumcoke · Jun 13, 2013

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$?

quantumcoke · Jun 13, 2013

Is my current PSU restricting the other components?

Dark Lord of Tech · Jun 13, 2013

http://www.newegg.com/Product/Product.aspx?Item=N82E16817207014

XFX Core Edition PRO650W (P1-650S-NLB9) 650W ATX12V 2.2 & ESP12V 2.91 SLI Ready CrossFire Ready 80 PLUS BRONZE Certified Active PFC Power Supply

hapkido · Jun 13, 2013

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.

quantumcoke · Jun 13, 2013

quantumcoke :

hapkido :

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.

Dark Lord of Tech · Jun 13, 2013

If you need more help stop back.

quantumcoke · Jun 13, 2013

clarkjd · Jun 13, 2013

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.

quantumcoke · Jun 13, 2013

clarkjd :

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?

quantumcoke · Jun 13, 2013

What do you guys request i do? Buy a new PSU or Motherboard or both? How big a difference would a new motherboard do?

hapkido · Jun 13, 2013

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.

quantumcoke · Jun 14, 2013

hapkido :

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

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