Put in 6gb ram pc only says 4gb

NiceJared

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Aug 11, 2011
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Hi, I'm new here because I needed a little help. I have a Dell xps 1640 windows 7 that came with 2 sticks of 2gb ram. I replaced one of the sticks with a 4gb stick so it should be 6gb of ram. When I booted my pc everything was normal and I checked my computer properties and it said I only had 4gb of ram.. how is that possible? I took out a stick of 2 and there was 1 more stick of 2 and I added a stick of 4. it should be 6! I'm stumped.. thanks for reading please reply :??: