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7970 Crossfire problem

post #1 of 5
Thread Starter 
Hey guys,

i have 2 ASUS DC2 7970's both are plugged in properly the lights on them are green and the fans spin, but when i look at display adapters in device manager it says there is only 1 card installed

I tried other Catalyst versions although i dont think that is the problem because the card just dont get recognized.

I hope this is enough info and one of you knows something i can do about it

EDIT: my motherboard is a Maximus III Formula
Edited by Jan-floor - 11/25/12 at 5:11pm
post #2 of 5
Did you try testing them one by one? which PCI-e lanes are you using? i see there are three on your Mobo. if you are using the last slot colour coded white, then thats why it isn't getting detected. That slot isn't meant for GPU's.
Vaporizer
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CPUMotherboardGraphicsRAM
AMD Ryzen 5 1600X 3.9Ghz@1.265V Gigabyte AB350N-Gaming WiFi Sapphire RX Vega 64 G.Skill Flare X 3200MHz CL14 
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Seagate 1TB 2.5" HDD ST1000DM035 Samsung 960 Evo 250GB Noctua NH-D9L Windows 10 Pro 
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Dell U2515H K70 Lux Cherry Brown Corsair SF600 NCASE M1 V5 Silver 
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Vaporizer
(16 items)
 
  
CPUMotherboardGraphicsRAM
AMD Ryzen 5 1600X 3.9Ghz@1.265V Gigabyte AB350N-Gaming WiFi Sapphire RX Vega 64 G.Skill Flare X 3200MHz CL14 
Hard DriveHard DriveCoolingOS
Seagate 1TB 2.5" HDD ST1000DM035 Samsung 960 Evo 250GB Noctua NH-D9L Windows 10 Pro 
MonitorKeyboardPowerCase
Dell U2515H K70 Lux Cherry Brown Corsair SF600 NCASE M1 V5 Silver 
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Steelseries Kana V2 
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post #3 of 5
Thread Starter 
Yes i have tested them one by one in both slots (the red one's) they work fine alone...
It shows as you can see in the screenshot that my PCI-e slot runs @ x8 when both cards are in place, when one is installed it runs @x16


7970.png 244k .png file
post #4 of 5
Try going through the bios and see if there is a option for enabling/disabling PCI-e lanes
Vaporizer
(16 items)
 
  
CPUMotherboardGraphicsRAM
AMD Ryzen 5 1600X 3.9Ghz@1.265V Gigabyte AB350N-Gaming WiFi Sapphire RX Vega 64 G.Skill Flare X 3200MHz CL14 
Hard DriveHard DriveCoolingOS
Seagate 1TB 2.5" HDD ST1000DM035 Samsung 960 Evo 250GB Noctua NH-D9L Windows 10 Pro 
MonitorKeyboardPowerCase
Dell U2515H K70 Lux Cherry Brown Corsair SF600 NCASE M1 V5 Silver 
Mouse
Steelseries Kana V2 
  hide details  
Reply
Vaporizer
(16 items)
 
  
CPUMotherboardGraphicsRAM
AMD Ryzen 5 1600X 3.9Ghz@1.265V Gigabyte AB350N-Gaming WiFi Sapphire RX Vega 64 G.Skill Flare X 3200MHz CL14 
Hard DriveHard DriveCoolingOS
Seagate 1TB 2.5" HDD ST1000DM035 Samsung 960 Evo 250GB Noctua NH-D9L Windows 10 Pro 
MonitorKeyboardPowerCase
Dell U2515H K70 Lux Cherry Brown Corsair SF600 NCASE M1 V5 Silver 
Mouse
Steelseries Kana V2 
  hide details  
Reply
post #5 of 5
Thread Starter 
Nothing in the bios:/ This is getting really frustrating now.
I forgot to say but they did work 2 weeks ago, when i tested if crossfire was working for me and it did work without any problems, i didnt even had to change a thing CCC just said you cards are in crossfire now.
And here we are 2 weeks later and nothing seems to work.
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