I built the following rig:

  • 1x AeroCool Templarius Imperator 1150W 80 Plus Gold
  • 1x HighPower Tech 1200w Gold Plus (HP-1200-G14C-GOLD)
  • 1x Asrock H61 Pro BTC Mother board
  • 1x W.D Caviar Green 500GB SATA III HDD
  • 1x Kingston KHX1600C9D3B1/4G
  • 6x Powered risers 1x 16x

I Installed Windows 8.1 and plugged one GPU. It automatically installed the Radeon HD 7990 driver. Then connected the second GPU and followed the same process with the other GPUs. Everything works fine for 5 GPUs. But for the sixth one, it won't install the driver.

5 gpu drivers installed, 6th one not

I try to update the driver of the sixth one but it says that the last driver is already installed.


  • What driver version are you trying to use?
    – user14010
    Commented Mar 19, 2014 at 20:46
  • the ones that install windows 8.1 by default, i suppose its the last version..
    – Egidi
    Commented Mar 19, 2014 at 20:56

2 Answers 2


(since I can't comment) I had this problem too about a month ago. Try using AMD Catalyst to install the drivers.


The real answer: Sell all of your graphics cards immediately and buy coins with the proceeds. you will never pay for the cards with all of their future mining combined at this point. If you believe in litecoin or altcoins, buy them. If your goal was to mine and exchange for bitcoins, buy bitcoins. The current estimator has 1 MH/s as being worth $127. Even if that holds for 3 months (doubtful) and you have free power (doubtful) you will have more than $380 in depreciation as people begin to sell their cards. When asics come out, you're done. Gross revenue will go to $10/month easily.

  • So someone waited almost a year before voting this down, during which time it was proven to be completely correct. This is the bitcoin stack exchange. This answer may not be applicable if this was a hardware-help stackexchange, but this was surely the best answer to this question in terms of bitcoin. Commented Mar 2, 2015 at 14:21

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