Im thinking of getting a cooler master silent pro 850w for my computer i am going to build.
I5 2500k, wil oc to around 4.5 ghz 2gb 560 ti, i will oc it and maybe upgrade to sli in future Raid 0 ocz vertex 3 120gb 6 fans Aerocool touch fan controller in future Asus p8z68 pro gen 3 8gb corsair vengeance 1600, no oc
I a, confident about the wattage but should i upgrade to a corsair professional series 850w for like 40 bucks more. Thanks.
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No, you're fine. CM makes good PSUs.
I'd go for the Corsair due to proven quality. If you are purchasing from Newegg, you could probably pick up a combo deal with the Corsair RAM.