I'm just wondering how many slots people are using on their motherboard and what do you have installed in those slots
ThisGPU + 10 Gb ethernet.
IIRC I've got 4 in use at the moment.
GFX
SATA (I think, it's been a long time since i looked)
2x USB3 cards.
The USB 3 cards are because I tend to run a bunch of devices and it seems that despite USB being sold originally as "up to 127 devices" Windows starts to get upset when you run more than about 6-10 per USB root hub especially if any of them are USB drives.
Sound card.
It's far superior than onboard audio as long as you have decent speakers/headphones to accompany it .
A lot of onboard sound, even when it has really good stats on paper, I find sounds dull.