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My OS is Windows 7 Ultimate 64bit, motherboard: Asus P7P55D-E, processor: intel core i7 2.8GHz. I bought 4 sticks of Nanya-Elixir RAM (DDR3 4096MB 1333MHz UDIMM, CL9). After installing them, windows detects 16GB of ram, but says that only 8GB is usable :(. I thought BIOS update would help, but it only raised the usable space by 10MB -- before, windows reported 7,99GB as usable.

How to fix this?

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Possible dupe of… – RJFalconer Jun 19 '11 at 10:12
Dupe indeed, reinserting fixed the problem – qqq Jun 19 '11 at 10:27
up vote 0 down vote accepted

Check (and double check) that they are inserted fully.

It's common for sticks to not quite be seated properly. Modern motherboards+win7 are able to spot this and simply report the ram as "unusable".

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