Hello, I want to buy the R9 290 Tri-x OC but I'm not sure if I have the sufficient power. I would like to know if you think my current 700W PSU will be sufficient for: i5 2500k oc 4.2 ghz 2x4gb kingston R9 290 Tri-x OC. (Waiting to buy it) Samsung 840 evo 250 gb . 2xHDD . 3 Fans. Asus P8Z68-V LX . And here my PSU: Thermaltake 700W Litepower. That's all. Thank you!