I already have 4 GB ram but only 2.43 GB usable in my Windows 7 32-bit OS. If I install 2 GB more with 4 GB of old RAM, is it possible to do that to increase the usable RAM size?
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2No. 32 bit bit Windows is max usable 4GM RAM. – DavidPostill Feb 16 '17 at 18:32
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3[Windows 7 Ultimate \[64bits\] - 12GB installed but 3,18GB usable](//superuser.com/a/872355) – DavidPostill Feb 16 '17 at 18:35
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A 32-bit operating system cannot address more than 4GB of memory. Putting additional memory into such a computer will be a waste. However, if you upgrade to a 64-bit operating system, additional memory will be found and used.
The link in David Postill's second comment above is quite useful.
Jeff Zeitlin
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