I have this board so I can confirm that you can't overclock with this board. You can get H81M- D Plus @newegg for $44.99 after $10.00 rebate card. Or you can get MSI z87-G41 at ebay for $55-$65. I was able to overclock w/ this board up to 4.5Ghz (60-65C max temp) with Enermax ETS-T40-TB CPU Cooler.
Any luck? I've been trying to oc with this motherboard and I was so happy when I found out that there was a new bios released. I couldn't change the multiplier with 805 bios and it's the same with 1002 bios.
You can overlock with H81M-P33 or Asus H81M-C,E,A,Plus except for H81M-K. I have the -K version and I'm still waiting for ASUS to release a new BIOS. I don't even think they are going to so I'm looking for an z87 or z97 board