Will this PSU be okay for a R9 280X Crossfire set up?
http://www.amazon.co.uk/Corsair-CP-9020056-UK-Series-Modular-Supply/dp/B00FG9FZS2/ref=sr_1_18?ie=UTF8&qid=1400170062&sr=8-18&keywords=psu
http://www.amazon.co.uk/Corsair-CP-9020056-UK-Series-Modular-Supply/dp/B00FG9FZS2/ref=sr_1_18?ie=UTF8&qid=1400170062&sr=8-18&keywords=psu