Anyone using the GA-EP45T-UD3R/P should get this kit if you're having trouble with your current kit ! (this might've been said already...)
http://www.crucial.com/uk/store/part...KIT25664BA1339

They use D9JMN IC's and overclock really well with my board. Got them stable at 1800 CAS8 with 1.8v. Still yet to try for more... going to wait until i get some heatsinks for them.