it will fit in the case, but you may need to move the ram over, as it will likely cover at least one of your ram slots
And there is no problem moving the ram ? (i mean related with the dual channel)
the RAM slot right next to the processor is free right now, (is the 4º slot) the second one is the 2ºslot, next is the 3º and the last is 1º.
you will have to consult your motherboard manual for which slots are going to be used for dual channel, sometimes it is the same coloured slots, and sometimes it is opposite. if you don't have the slot closes to the cpu populated, you should still be fine for clearance on the other ones, thus allowing for dual channel