i installed a new cpu, and now it says only 8 gb of ram is being used out of my 16

Aug 12, 2018
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i got a new cpu recently for my birthday, and i had 16 gb working before. i use shadowplay to clip moments from games and share them or send to friends, and that always showed my specs, which included 16gb. Now it recognizes the new cpu, but only 8gb of ram. any ideas? thanks