I just instaleld a fresh copy of Windows XP Professional x64, and from what I gather, this version can support up to 128 GB of ram? My system is currently only showing 16 GB out of 24 GB? Any ideas to why this might be?
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Check your motherboard specs. That may be the most that the motherboard can support.
Check boot.ini to see if it has the /3GB switch. If so try removing it.