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like the title,

if yes it can use all my RAM if needed ? or max just 2GB

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Short answer: YES.

The limit of 32bit is exactly 4Gb. In case of Ubuntu even a bigger amount of ram can be used with 32bit if you are running a so-called 'PAE' kernel. The installer is smart enough to choose for you the best kernel based on the ram amount.

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    Actually there is only a pae kernel these days. – psusi Jan 15 '15 at 14:12
  • psusi, I didn't noticed that. :) Thanks for info. – Frantique Jan 15 '15 at 14:37
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32-bit processors can access 4GB of RAM maximum without PAE (physical address extension). With PAE, it can access 64GB of RAM.

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