Either combination will work for Dual Channel, it's just not ideal, since neither will be a matched set and problems might arise (BSOD's and general instability). It's always best to get a Dual Channel kit to avoid those potential problems with the unmatched modules.
I still STRONGLY suggest getting a Dual Channel kit if you can. You'll be guaranteed no issues then.
I know man....I am just so pissed off because they don't have any dual channel kits available of any brand RAM in their store (had a chat with them)
So I have no other option other than to buy 2 sticks of any of those that I linked in 1st post.
I just need to know if both of them support dual channel mem configs or is there one in them that doesn't support it?