Ram recognised but not usable

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Joined
6 Dec 2017
Posts
2
Hi,
I just bought an extra 16GB of ram to upgrade the 16GB already on the motherboard, but although the ram is the same as the original, the OS windows 7 can see the 32GB but says 16GB is not usable.
Is there an activation that has to be done to make this new ram usable?
I thank you for your help.

Specs:
OS: Windows 7 sp1
Motherboard: Asus Sabretooth 99FX R2.0
Ram: 4 x Team Group Elite Black 8gb DDR3 PC3-132800C11 1600MHz
 
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