No they arent actually, I'm quite sure that every single HD 5000 card can reach 1000 Mhz, you just have to increase the voltage to somewhere between 1.2-1.3v.
You mean 1.2-1.35V + higher fan speed to get it to pass Furmark extreme mode
Intel Core I7 920 @ 3.8GHZ 1.28V (Core Contact Freezer)
Asus X58 P6T
6GB OCZ Gold DDR3-1600MHZ 8-8-8-24
XFX HD5870
WD 1TB Black HD
Corsair 850TX
Cooler Master HAF 922
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