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GA-MA785GPMT-UD2H RAM Issue...

Just finished a budget build for a relative.

Athlon II X2 245
Gigabyte GA-MA785GPMT-UD2H Mobo
4GB DDR3-1333 G.Skill RAM
WD Caviar Black 1TB, Samsung DVD writer, 380W Antec EarthWatt, Antec NSK2480

For some reason, my BIOS reports I only have 3.5GB of RAM in the Stanard CMOS Config screen. I inserted both RAM modules individually and BIOS reported 1.7GB extended mem.
Can someone tell me why this may be? I'd like to use all 4GB of memory.
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More about ma785gpmt ud2h issue
  1. Best answer
    By default, your Radeon HD4200 graphics chip is set to use both the on-board 128MB DDR3 SidePort memory, and an automatically allocated piece of your main memory real estate - that's why you're 'missing' some... The settings are on the "Advanced BIOS Features" page of your BIOS, and are documented on page 47 of your manual.
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