Quote - Just to clarify...... when the OP mentioned  XP SP3 bit, I was under the impression that he meant Windows XP home version, which is 32 bit also, and on that one the /3GB switch doesn't work. On Windows XP Pro 32 Bit the switch will work, but from what I did read the OP isn't talking about XP Pro at all, but about XP Home version. In the light of that, the info I gave is correct.

to quote "Whatever you do never use the 3GB /Large switch on XP32! It's for XP64 only!"

no, the info you gave is NOT correct.