I've got a Gigabyte AMD Radeon HD 6850,
the install was easy, I take it out and installed Mountain Lion with the internal graphics of my processor. After the installation I put the HD 6850 back in!
Looks like a nice system, I will build a system soon also with your motherboard, CPU, RAM and SSD
1. Yes it is, search on the forum for HDMI audio and you'll find a thread for HDMI audio and 5.1 sound.
2. The Thunderbolt is working if you connect it before booting, no hot swappable...
Article: How to upgrade from BIOS to UEFI on Gigabyte's 6-series motherboards
How did you flashed your Bios to UEFI? Because for me it isn't working and I have the board. :banghead:
Thanks in advance
CPU: AMD will not work, you'll need an Intel Processor!
RAM: will work
MOBO: Gigabyte is a nice brand but you'll need an board for an Intel Processor
HDD: Any HDD/SSD will work, when you have an HDD which is bigger than 1TB you will need partitions!