Hmm I just got a new laptop with 4Gb DDR3 ram and a Nvidia GT130M hybrid hotswap graphics card but the usable ram still shows up as 4GB with a 64 bit OS so I'm guessing that it also has some onboard memory or summin similar?
a 64-bit OS will allways show the full ammount even if its being used by the VGA its just the way its coded...
If you set bios to factory defaults and ensure that the onboard ( if it is onboard ) graphics is set to minimum amount possible and see if that helps - also read the read me for the bios update and see if there bioses ( both comps ) are both up to date.
Also use utils such as cpu z or the likes ( plenty out there ) to see what they report with amount of ram
If they are the same model then I'd guess at graphics ram. Most on board graphics chipsets use system ram for graphics ram. It's dynamically allocated as needed. Could be, for whatever reason, that 1 laptop needs a little more graphics ram thant he other.
On such systems the figure set in BIOS is the maximum amount that can be taken for graphics and not the amount that is always set aside for graphics.
I have tried with the exact same model and with a different one now, its just silly lol.
Im not fussed either way and I certanly wont be losing any sleep over it
Ho hum, its just one of those ICT quirks
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