I am currently running a single channel 8GB @ 2400 card. I have an ancillary slot in this laptop, for which I bought a second 8GB @ 2400 card. The second card is a different brand than the stock card. Dell claims that the different brands will still allow the laptop to run in duel channel mode. Can someone confirm that this is true? The stock card is an SK Hynix and the second card is a Crucial.