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Originally Posted by njankit  @axeman I m aware of the 32bit architecture limits but does it imply to BIOS too.
I guess no matter what OS i have my BIOS shud recognise full 4GB.
BTW will just installing 64bit OS make my system 64bit?
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Your processor must support 64 bit to be able to even install 64 bit OS.
Use a tool like everest or CPU Z to see the details of your RAM sticks as seen by the Mobo. I am 100% sure u will see 4Gb total there. It would be next to impossible to make a 1.5 Gb RAM stick just to cause you trouble.