Bios only Detects 4 of 8GB's but W10 shows it has 8 Installed, but only 4 Usable?

Lokogar123

Reputable
Feb 8, 2016
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I know that the motherboard can support over 4gbs of ram, because its ran all 8 fine before, I've tried reinstalling the cards into all different slots to no success. Any help would be greatly appreciated!!!