Ordered my parts now where do i go about installing everything windows vs bamt?

[Dogebear]

So i just ordered my parts and i was thinking how do i install everything initially like bamt or windows? do i need any dummy plugs? Do i first plug in my 7850 into the first slot install windows 7 set up bamt then keep it there. My mobo doesnt have onboard gfx.

PCPartPicker part list: http://pcpartpicker.com/p/2J454
Price breakdown by merchant: http://pcpartpicker.com/p/2J454/by_merchant/
Benchmarks: http://pcpartpicker.com/p/2J454/benchmarks/

CPU: AMD Sempron 145 2.8GHz Single-Core Processor  ($43.99 @ Newegg)
Motherboard: Asus M5A97 R2.0 ATX AM3+ Motherboard  ($94.99 @ Newegg)
Memory: G.Skill Ripjaws X Series 4GB (1 x 4GB) DDR3-1600 Memory  ($44.99 @ Newegg)
Video Card: XFX Radeon R9 270X 2GB Video Card (2-Way CrossFire)  ($227.27 @ TigerDirect)
Video Card: XFX Radeon R9 270X 2GB Video Card (2-Way CrossFire)  ($219.99 @ B&H)
Video Card: PowerColor 7850
Power Supply: Corsair Professional 1050W 80+ Gold Certified Semi-Modular ATX Power Supply  ($200.98 @ Best Buy)
Total: $859.20
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-01-28 20:57 EST-0500)

also x 3 powered usb risers. Will i be able to plug in a dvi cable into the video card if its running on a usb riser?

[markonegolf]

Have you got this to work? I have a similar Mobo, ASUS P8Z68-v LX and I can only get 2 of 4 cards running - the only work when connected, by risers, to the x16 slots. I can't get Windows or CGminer to pick up the extra cards connected to the x1 slots .

[griffinriz]

I read all over the internet that XFX is not as good as Saphirre and Asus.Better go wtih Saphirre 7970,it will give you above 700Khs.