I have 6gig memory but only shows 4..

Sep 2, 2018
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Guys please help me

I just upgrade my memory to 6 gig i have a 4gig and a 2gig gel .. bios read to memory but only 4gig shows in total. Ive try switching slots and its shows the same result 2 and 4 gig ram shows but only 4gig shows in total. Tried reseting cmos, load default, updating my bios, still can fix the problem. My mother board is GigaByte Gigabyte GA-F2A68HM-S1 amd a6-6400k apu .. please help me ..