Athlon 4400e dual channel ram?

Hi, I have a sempron 140 unlocked to an athlon 4400e and i cant get my g.skill flare to run in dual channel mode.

Is this a limitation of the memory contoller on the sempron or could it be the fact that there is a missing gold finger on one of the ram sticks?

Just knit-picking, the 140 would unlock to an Athlon II x2 235e, given the Sargas core is based on Regor. Refer to your motherboards manual and make sure you have at least 1 DIMM in each channel.