Ok, the Power Supply may be an option, but with its efficiency it should easy handle your hardware.
One thing you shouldn't forget is your ping! The servers are all overseas and from us you have sth. between 150 and 300. In random cases less than 130...but that's not often. In other words - when the Server gets the information of your opponents position it hast been 35ms later...plus calculation and sending the info overseas it has been travelling for app. 200ms...when you send your info back (shot, knife, whatever..) it takes another 150ms....so your shot reaches a point where your enemy HAS BEEN 350ms before! So if so. is running for e.g. from left to right I shoot in front of him so the bullet hits him.