Windows 2003 enterprise server not seeing more than 3.5 GB RAM memory

I know this question has been ask but could someone please inform us a little.  We have 2003 Enterprise server SP2 I have 2 / 4GB sticks and the system shows 3.5GB.  It was my understanding that this version would support up to 32GB.  Do I need to use the /PAE or obtain the 64 bit version??? Thanks in advance.
hotpAsked:
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akrdmCommented:
This article states that you only have to use the PAE switch if you don't have hot add memory devices.  So you could try setting the switch in the boot.ini file to enable the support.  No you should not need a 64 bit OS to see the 4 Gigs.  Also if you have an onboard video card it may use some of the memory as needed for video processing.

http://support.microsoft.com/kb/283037
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Windows Server 2003

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