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Crossfire HD6950's poor performance

Hi, I have just built a new system using two crossfired HD6950's.

- CPU: AMD Bulldozer FX-6 Six Core 6300 3.50GHz with 4.1GHz Turbo enabled
- Motherboard: Asrock 970 Extreme3 R2.0 (Socket AM3+) DDR3 Motherboard
- RAM: 8GB 1600MHz Dual Channel DDR3 RAM

I have done a fresh install of Windows 8.1 and I have installed the latest beta drivers.

Getting serious framerate drops in the likes of BF4, CoD Ghosts and some of my older games. Some games are just consistently low. My older system was 5 years old with a single HD6950 and works slightly better

zGPU shows one card at x16 and one at x4 but they are both in x16 slots.
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More about crossfire hd6950 poor performance
  1. go intoo the mobo bios and look for your pci-e settings probably just have to enable it.
  2. Thanks :-)

    I couldn't see anything in the BIOS for PCI-e but I'll have another look. Does the CPU look good enough? Could it be bottlenecking?
  3. The only setting in the bios relating tothe PCI-e slot was a voltage control. Choice between 1.81 or 1.92 volts?
  4. Best answer
    thehoaremaster said:
    Thanks :-)

    I couldn't see anything in the BIOS for PCI-e but I'll have another look. Does the CPU look good enough? Could it be bottlenecking?
    no bottleneck. there should be a setting between bus speeds...
  5. Never found it but I've had time to install a few more games and its performing great on a lot of them.
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