Im not sure if you can mine CPU and GPU at the same time. Im su9re its possible but I dunno what problems it might cause.
With Windows you are probably gonna have to do some tweaking to get all your GPUs to work. Like make up some dummy plugs, and make sure you run the two MAX_ALLOC... commands. Forget exactly but youll find them if you search.
If this will be a dedicated mining rig I suggest using Litecoin BAMT. It seems complicated but its really alot easier and my BAMT rigs run 24/7 for months.
I run Asrock970 ex4 with 5x R9 290 all on 1x16 powered risers...I had to short presence 16x slot (the on in the middle)..Once I done that system was detecting 5 cards but one kept getting SICK in CGMINER so I short presence 1x slot on the right from this 16x slot (the one in the middle - they are only 5 so it's easy to find) since that action everything seems fine (24h from then)..I still wonder if shorting the 1x slot was necessary or is it just bad card (it shouldn cause it was ok on this board for more then 1 month until i decide to upgrade it from 3 cards to 5 cards)...
Now i'm building new rig cause I want to run 10 cards and I wonder shall I order new mobo excatly the same, or some with 7x slots so I will run 6 cards in it and 4 cards in the current 970 ex4. what do You guys think? do you know any ~cheap mobo that can run 6x r9 290 with no problems (i don't care if i have to short the slots, I just don't want any card to keep dying during mining)...
What options I can switch off in bios to free some pci-e lines ?