Windows 7: Would like your educated opinion on Crossfiring

System Manufacturer/Model Number A blend of brains, brawn and dumb luck, ask me about rig #2 !
OS Windows 7 Ultimate 64
CPU i7 3770k OC'd 4.6 @ 1.17v, still love my FX 8120
Motherboard MSI P67A-GD80 b3
Memory 16 gb Crucial Ballistix Tracer DDR3 9-9-9-27 @ 2000
Graphics Card XFX Radeon 7870
Sound Card On board HD audio with lossless 24 bit/192 sample rate
Monitor(s) Displays (2) LG LED 23" 1920 x 1080 2ms Monitors via mini d-port
Screen Resolution 1680 X 1050 p

Keyboard (2) Logitech Illuminated Keyboards (1) usb (1) wireless K800
Mouse Logitech G9x & T-BC21 - nano nx for the laptop
PSU Ultra X4 modular 1050 watt 80% silver rating & APC 1200 RS
Case CoolerMaster Storm Styker
Cooling 6 case fans 140mm & 120mm, Thermaltake h2o extreme
Hard Drives Samsung 256 gb 830 SSD sata III (2) 1 tb Hitachi deskmates/sata II (1) 1 tb WD green/sata II (2) 2 tb WD My Book/esata (1) 500 gb Sea. Freeagent/esata (2) 250 gb Sea. Freeagent go's/usb (1) WD 2 tb Green 64 sata III (1) 120 gb OCZ Vertex SS
Internet Speed Upgraded from bottom of the barrel to bareable
Other Info 4 Noctua case fans + 3 Noctua in p/p on H100 cooler Integrated hot swap drive bays for 2.5" Drives (2) Lite-on dvd/cd optical 22X Integrated fan controller and led on/off HP Officejet Pro L7680 all-n-one HP 4 laserjet (the beast) Hot swappable 3.5" hard drive bay Belkin Play N600 HD router Asus USB 3 & sata 6 PCIe card Vantec IDE to sata adptr./Ultra sata adptr HP Probook i3 laptop