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Question about Crossfire and adjacent slots w/ R290s

Tags:
  • XFX
  • Crossfire
  • Graphics
Last response: in Graphics Cards
July 14, 2014 5:55:04 AM

Hello Everyone,

I have a question about adding a second XFX r290 and crossfire. My setup is as follows:


CPU Intel Core i7-4770K 3.5GHz Quad-Core
CPU Cooler Noctua NH-U12S 55.0 CFM
Motherboard MSI Z97-GAMING 7 ATX LGA1150
Memory G.Skill Ripjaws X Series 16GB (4 x 4GB) 2133 (PC3 17000)
Storage Samsung 840 EVO 500GB 2.5" SSD
Video Card XFX Radeon R9 290 4GB Double Dissipation
Case Nanoxia Deep Silence 1 ATX Mid Tower
Power Supply EVGA SUPERNOVA 1000W 80+ PLAT
Operating System Microsoft Windows 7 (OEM) (64-bit)


Unfortunately when I had moved my video card from the middle PCIe slot to the one nearest the CPU, the bracket came off on the motherboard and it looks like the pins are damaged. Rather than get a replacement and have to deal with downtime, was wondering if I can put a second XFX R290 on the furthest PCIe slot from the CPU. This would leave one in the middle. In other words, do the cards have to be adjacent to support crossfire?

My other questions are since there is no bridge/bracket for R290s, other than drivers is there anything I'd need to do to enable crossfire. Also, given my setup do I have any bottlenecks in my system or can I truly maximize the crossfire performance for gaming.

Thanks in advance for any help.

Cyc.

More about : question crossfire adjacent slots r290s

Best solution

July 14, 2014 6:12:16 AM

1) As for the motherboard, yes you can use the lower slot but then your gpus will run at a slower speed at it won't be as fast the two closest slots. They will run in x4 speed, instead of x16 or x8. This may degrade performance. If you can wait, I recommend getting the board replaced.

2) The 290 DOES need a crossfire bridge. Look closely at the back of your cards, you will see two golden fingers that is where the bridge goes. The problem is, you will now need to find a longer bridge if you space your cards out.

3) No, your system does not at all bottleneck these cards and you will see great performance.
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July 14, 2014 2:33:49 PM

tambeshakunt said:
1) As for the motherboard, yes you can use the lower slot but then your gpus will run at a slower speed at it won't be as fast the two closest slots. They will run in x4 speed, instead of x16 or x8. This may degrade performance. If you can wait, I recommend getting the board replaced.

2) The 290 DOES need a crossfire bridge. Look closely at the back of your cards, you will see two golden fingers that is where the bridge goes. The problem is, you will now need to find a longer bridge if you space your cards out.

3) No, your system does not at all bottleneck these cards and you will see great performance.



Thanks for the quick response, I guess I will send the motherboard back to be replaced, but I'll probably end up using it in another PC.. in the meantime if I replace the motherboard, is there a motherboard model you'd recommend.. basically I want my PC to be able to play games like ESO, Far Cry 4, The Witcher 3 at max settings with high frame rates....

Thanks,

C.

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July 15, 2014 5:50:48 AM

I've got the r9 290 cross fired and it doesn't need a crossfire bridge. Make sure you do a clean install of the drivers after you install the cards and crossfire should be enabled automatically. You can also manually enable/ disable crossfire in amd catalyst.

They're fantastic cards in crossfire however you may need to tinker with some games to get the most out of them.
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