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I know that on 32 bit system max number of memory cells in RAM is 2^32. But RAM in my computer show not exactly this size. Can someone explain why on 32 bit system size of RAM not equal max size of cells but varies(3.2 - 3.6 Gb)?

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marked as duplicate by mpy, nc4pk, Mokubai, Simon Sheehan, Moses Oct 30 '13 at 1:47

This question was marked as an exact duplicate of an existing question.

Where are you getting that max-ram information? Is this a Windows machine and you are viewing the Computer properties page? – Áxel Costas Pena Oct 29 '13 at 12:02
@user2135931 - What operating system are we talking about? Required reading before you reply to my question:… – Ramhound Oct 29 '13 at 12:43
see… for your answer – Frozen Flame Oct 29 '13 at 12:49
32-bit systems can have more than 2^32 "memory cells". Memory is addressed in bytes, not "memory cells", so that gets you to 4 GB. Physical address extension allows more than 4 GB, though often only the OS will have all memory available to it, and individual applications will have a maximum of 4 GB assigned to them. – wingedsubmariner Oct 29 '13 at 13:28

Two obvious possibilities come to mind:

  1. Your 32-bit system supports 4 GB, but you haven't actually installed that much memory.
  2. Windows reports less than 4 GB available, because some of the main memory has been reserved for use by the integrated graphics.
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