I'm using Newegg's power supply calculator for my new build, and I need to know. I'm not sure which it is, its a ROG board so I would think its high-end, but its also a micro-atx. This is my first build ever, so I'm not sure what its considered as.
Asus Maximus V Gene
Intel core i5-3550
HIS Radeon HD 6850 IceQ X Turbo Video Card - 1GB- PCIe 2.1- overclocked
Thermaltake V3 AMD edition- 2 red led 120mm fans
Corsair 4GB ram(2x2GB)
Intel Centrino Ultimate-N 6300
1TB HDD- 7200rpm
160GB boot drive HDD- 7200rpm
24x DVDRW drive
and I'll be runing windows 7
I'll most likely add Asus/Intel Thunderbolt, and add 2 more 120mm red led fans, and possibly upgrade my gpu in the future.
a 650w-700w psu will do enough(possibly 600w as well but i dont know how thunderbolt goes into power consumption) as ivy bridge consumes less watts and the 6850 is a mid range card. though are you sure your mobo supports thunderbolt, i personally have minimal knowledge of what it requires.
I also recommend that if you crossfire 2 6850s, and you have a spare 6 pin power connector left, the 2nd 6850 should be a sapphire toxic 6850(if you can find one), only because it can take the heat off the his iceq fans and spew it from the back. though this is just if you want minimal temperatures in the future.