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Graphics Card Supports 4 Monitors, But Only 2 Work

I am running Radeon Sapphire HD 7950 which should support four monitors. I have three hooked up right now, one with Dual Dvi, one with hdmi, and one with mini display port converted to dvi. I am running windows 7 64 bit, which detects all three monitors but will only activate two at a time. When I try to activate the third, it merely says, "Unable to save display settings" with no further explanation. I cannot figure out what is wrong.
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    You must use an "Active" DP to DVI for Monitors 3 and 4. I use 2 active adapters and run 4 Monitors on a 6950. Be careful of some cheap brands, I have seen many people in this forum complain of them not working!
    http://www.amazon.com/Accell-B087B-006B-DisplayPort-Single-Link-Certified/dp/B004071ZXA/ref=sr_1_1?s=electronics&ie=UTF8&qid=1384309764&sr=1-1&keywords=accell+mini+displayport+to+DVI
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