Just depends really. After reading around a many diff places I have found that the head room is not big on the 850's. They oc fine, but the 800 oc's better. And most 800 can reach 850pe levels, and tweaked you can easliy pass the 850 levels. Now with that in mind you could tweak the 850 and hope for the best. I kept the 800 and decided to tweak it. It worked out very well.
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