I'm kind of interested in C2, but I don't think I can give up this current C1. I tried 3 chips and kept this one that does 5Ghz all day at 1.42v. It'll hit 5.1ghz at 1.44v...but I've had a few crashes at those settings and it takes almost 1.5v to iron it out....far too much for 24/7. So I've settled on 5.0Ghz 24/7.
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Unless there is better clocking I'm gonna sit tight on this current C1 methinks.