do I need to be worried about compatibility much or is it not a huge issue? If I'm looking at swapping out some components I mean.
Nope that's pretty much all there is to it. The CPU needs to fit in the mobo (same socket) as well as the cooler. The memory needs to match too (but it's all DDR3). Power supplies usually have connectors that snap together/apart depending on the mobo requirements. Drives are almost exclusively SATA (which are all backwards compatible anyway). Expansion cards are usually PCI Express of some flavour (mobos have a few of each).
I think all the builds so far look fine in terms of compatibility. I'm not really too wellversed in terms of amd builds but faster ram is a midst have on those with built in graphics
The integrated GPU in AMD APUs doesn't have any cache, so the link to the system memory is a huge bottleck, so fast memory (2400) gives big FPS improvements. This will probably be the same when HSA applications start appearing, so fast memory is essential in APU builds IMO.
 
	 
  
 
		 
 
		
 
 
		