abit ip95

I have a desktop with win 10 64 bit installed and 2x2gb sticks of ram on the mobo for a combined 4gb of ram. Only 2.9 gb of ram shows up as usable tho. Is there a way to fix this. Both sticks are working fine. I have a abit ip95 mobo that has a max ram support of 4gb, I heard that this could be...