I have a p8z77-m and i was easily able to overclock my processor to 4.6. It can and should go further up but i did not try. It's still running at 4.4 @ 1.25v without any problem. I would say it's a very decent mobo for its price tag.
M and M-Pro - both are matx but they have VRM heatsinks which comes handy while OCing and the pricing of P8Z77-M is really very good .. under 10k it's a very nice deal.
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