Now, ASIC is not the only determining factor. The remaning 3x 7850's I have owned (I build systems for other people), overclocked somewhere between 1150 to 1250MHz and had ASIC's between low 70's to high 70's. It had an ASIC of 64% an struggled to run stable at 1050MHz, no matter the voltage. The worst card I owned was an MSI TF3 7850. Both of these cards indicated 84-85% ASIC. One was a 7850 than reached 1360MHz stable (at 1.3v with an Accelero TTII cooler) and the other is my current 7870 than does 1325MHz stable (1.3v stock Windforce cooler). I have owned two cards which overclock with complete stability above 1300MHz. Every single one of my 7800 series cards has overclocked according to ASIC quality.
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