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Well I assume that after you had this problem you did a clean sweep of your drivers before installing the newest Cats. Try to see if using one or both crossfire connector is your problem. If you're running both, remove the one closest to the cooler, if you're using one... connect both. It may or may not make a difference. If you have multiple power connectors, try using as many from different rails as you can. If you happen to have a PSU with a single rail then ignore that suggestion. In your BIOS under memory overclocking or memory properties there may be something called a "Low Memory Gap". If this is some low number, for instance 1-2GB make it 3-4GB. Have you tried changing any preferences in CCC? Please respond with a list of what settings you've changed in case anyone can give their suggestion on some setting that should be off/on when crossfire is active.
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