do all motherboards have 4 ram slots - installation - What do motherboard RAM slot colors mean? - Super ... slot jago 888

Yellow and orange, blue and black, green and red: you'll find the RAM slots on motherboards in all sorts of color pairs.

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So I have 16GB RAM. After upgrading to Windows 10 however it says I only have 8GB. When I look in task manager it seems to know I have 16GB but for some reason only using 8Gb of it and for slots used it says 2 of 4 when I'm using all 4 RAM slots. I'm not techy at all but if somebody could explain to me why this is it would be appreciated. If it is something like just a broken RAM stick then that's easy to fix but I don't want to go out and buy a bunch of new RAM if it's a different issue.