Best forum to discuss hardware issues?

I recently started mining on Windows 7 with a couple of different HIS R9 280X (one 850, one 1000) and there were so many hardware problems I don't know where to start. I wanted to just install them into my existing systems. They hash at different rates on different motherboards, have widely different temperatures, cause system freezes and really bad display artifacts... I've never had that many problems with graphic cards in my life.

Where is the best place to look for solutions?

My current board is a gigabyte z77x-ud5h, i7-3770. The cards run hotter and slower than on my older gigabyte board, but that one will not recognize 2 cards at the same time, even with the newest bios.... I really don't know where to look at this point. I'm planning on replacing one card (the 850 works cooler ans faster) to make things simpler...

I'm open to the idea to get a new motherboard but I don't want to get the whole mb/ram/cpu etc setup...

Thanks.