[fatcode]

Ok, so I'm reporting here success with the Gigabyte GA-H55-USB3 Motherboard for a HD3 system running Mountain Lion. Big thanks to aaquilato for helping out and suggesting this MOBO.

I was getting error -9162 so I had to move the core card around in different slots but got there in the end. The 192 is now connected via an Accell card. I had a few editing/mixing sessions in the past days and all was well.

The only thing not working is the USB 3. Apparently to get the two USB 3 ports to work the NEC controller on the MOBO need updating to the latest version.

You can get a HD3 on the Jetway, as I reported it works with 10.6.8, very stable; I didn't manage to get it to work with Lion or Mountain Lion as reported elsewhere but I'm not sure if there is much interest in this forum to go to 10.7 or 10.8.

Between the two, unless you're after 32GB of memory, a slightly faster CPU and want to give it a shot with HD4, I would go for the Gigabyte boards as the edited DSDTs make life a lot easier.