I spoke too soon. For no apparent reason, sound card once again started acting up. I noticed it even getting power cycled during time in the BIOS. Literally, the board is cutting power to it randomly. I tested the card on my old board (also Gigabyte, EP45TUD3) and it seem to be totally fine. Its likely the UP4 and the Recon3D that do not get along.
Worse, I find the F5b BIOS has horrible overclocking. Setting the BCLK 1.25 and a multiplier of 36 = 3500? It just ignores gear ratio at certain multipliers. If I use 37 at 1.25 it gives me the proper 4.6Ghz, it won't boot windows, but its correct. Even without messing with the gear ratio, using a multiplier of 43 results in it actually being 28, it's screwy as hell.
F5c corrects the multiplier issue, but messing with the gear ratio at all in conjunction with any memory tweaks results in repeating boot failure. F5c will not power the sound card at all either. But F5c can at least get my 3820 to 4.3Ghz AND use my intel XMP settings at 2133Mhz RAM and be rock solid. Just wish the damn soundcard would work... and that I could somehow get to 4.5Ghz
Overall I have had more OC issues with this board than ANY other Gigabyte board I've owned. It's been out for over a year, Gigabyte needs to step up support on this BIOS and get it 100%. Even the BIOS it shipped with ignored certain multipliers. This should not be hit or miss, multipliers should always give accurate results. Not saying it should work, but it should be what the math says it should be.