We know some of you are having some slight problems with your builds and as we've pointed out in the past, this can be related to the BIOS/UEFI, especially if you're using a new motherboard. Gigabyte's 7-series motherboards have only been out a couple of months and as most of the boards are shipping with an early UEFI release, the company is issuing regular updates and a wide range of boards have received multiple updates in the past couple of weeks, so we thought we'd highlight this once more.
The boards in question are the GA-Z77X-UD5H, GA-Z77X-UP4 TH and GA-Z77X-UP5 TH. In this case the GA-Z77X-UP4 TH was sitting on release F4 for a very long time, but Gigabyte has removed that version entirely from its website, so it's pretty clear that there were some issues with this UEFI update. The latest version is F7 at the time of writing which was released a week ago. The release notes are fairly uninformative, but the F7 release is meant to improve system compatibility whatever that implies.
The GA-Z77X-UP5 TH is already on version F9, although F5 through F7 are missing here. We should also point out that the earlier release for both the GA-Z77X-UP5 TH and GA-ZZ7X-UP4 TH added some improved graphics card compatibility fixes. The slightly older, but more affordable GA-Z77X-UD5H has already reached UEFI revision F14, although here we once again have a gap from F8 all the way to F13. This board should feature the same updates as the previous two models.
Note that Gigabyte's UEFI and BIOS updates come as a self-extracting 7-Zip Windows executable package and as such you need a suitable un-archiver for OS X (Stuffit Expander
works) if you don't have a dual boot system. The UEFI update needs to be copied onto a FAT32 formatted USB drive and you can then use Gigabyte's Q-Flash updater from within the UEFI itself to update your board. We highly recommend doing this, as it's highly likely to fix issues with your CustoMac, although we haven't had a chance to test the latest releases just yet, so you want to play it safe, you can wait until we've had a chance to do some testing and report back. However, it's always possible to flash back to an older UEFI or BIOS, so it shouldn't be a big deal.