bangawking

Hello friendly People, I'm a cheap guy and already had two 4gb 2400 Ripjaws V total of 8GB on dual channel . . today, I'm less cheap and can afford another two 8GB stick of the same frequency as the previous ones. I have four slots and want to keep my existing Two 4GB, can i install the two 8GB alongside the two 4GB ram on dual channel like so (4GB + 8GB) and (4GB + 8GB). Pls send help!, The Bangawking