Can i do a 2X4GB And 2X8GB Config on X79-UD3 Motherboard (gigabyte)

I have 2X8GB Installed but i would like to increase it to 24GB by adding 2 extra sticks of 4GB, both would be the same brand and speed just different capacitys.

and would it be able to be ran in quad channel mode?.
 
I think it would work however it wouldn't be able to be run in quad channel mode because the sticks are not all identical.
 
Okay :3. though i heard somewhere that some motherboards can run ram that's mixed like that in double dual channel? like it'll run the 2x4 and the 2x8?

dunno if it is true though.
 
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