Ah, BIOS problems. You know, that's par for the course when a board is freshly released, and I do push things pretty far when it comes to stability testing.
The UD5H, when I tested it, was much more mature, and at the same time, was a big step up from P67 and Z68-based products, expecially considering that was when Gigabyte launched into UEFI BIOSes for SKT 1155. What a great product for Gigabyte that is!
Since then, my expectation out of all the OEMs is a bit higher, and a fair bit different. For an enthusiast class product, the UD5H does score better in benchmarks overall compared to the UP5 TH, as the UP5TH did have a bit of a performance deficit.
Now, I must be honest. Performance compares, with results as close as my reviews are, are almost silly. At the bleeding edge, yes the UD5H is faster, so it scored higher, and that is all. Gigabyte's BIOS engineer merely needs to tighten up the Turbo profile a wee bit, and the UP5 TH will match the UD5H...but there's nothing WRONG with the UP5 TH. The BIOS is the issues because that's what needs to be changed to make it perform like the UD5H, not because it's unstable or anything.