What ram do you have in there? Did you set the timings and voltage manually?
Have you used something like hw monitor to watch your temps and make sure nothing is overheating? Did this problem start recently or is this a new build?
I have kingston hyper x limited edition 1066 ram and yeah i set it to spec at 2.2v. And its fairly new build however i have always had this problem i have jus tried to put up with it.