From my old days (pre-Win2k), if you had 4 gig of ram on your 32-bit OS machine, you could use one of those utilities, but you also had to change settings in the Boot.ini file for Win-2k or XP. You use BCDEdit in Vista, Win7 & 8. Thirty-two bit versions - not 64. I haven't a clue about 10... Both the program ~AND~ the OS have to be "aware", and still, some apps just don't like it and will crash.
Anyway, about the most concise site for that still is the
AutoDesk Knowledgebase. I used to use that for video editing back when... Doing that on a machine with 2gig of RAM would be an exercise in futility and crash recovery.