I can't really speak for the overclocking capability on air cooling, since don't really my systems on air cooling. In fact, I don't even use mounting for the CPU heatsink; just use the thermal paste and gravity. It kinda limits the overclock by heat, but I got the same results on the UD7 as I get on the R4E with 6c12t (~4500 3D11 with 1.4V). I do recall there were some OC limitations (around 4.8G) with the earlier bioses (pre-F7), but I should verify if that's still the case. I think I wrote about it in the thread at hwbot forums (
link).
Even back then, though, I never had any issue clocking up with subzero cooling. Same goes for the GD65 and Sabertooth. When you take those boards subzero, you should be hitting the same CPU OC all the time.
This board is not as easy to work with as the R4E. It's more of a challenge to get where you want. Well ... once you figured out how it responds, you'll know how to work the bios and get your result. There are a couple (ehem) things I'd like to see fixed ASAP, though. Anyways, have fun with that F5 board
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//edit: concerning the "user error" part. Last week, I ran this exact same chip on the R4E for the PCMark7 stage of the Country Cup and the board did a hard shutdown at 5.2GHz. Two days later, it got to 5400 no problem. Just to say ... user errors happen ALL the time
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