2 gb of ram only 1.70 usable

madman21 · Jul 27, 2016

my computer used to be OK until upgraded to windows 10
i had 2 gb of ram and it said 1.76 is usable
i thought it was a problem with the bios so i flashed it and then i had 1.70 gb of ram

PC specs:
Pentium g630
asrock h61m-hvs mobo
one 2gb stick of ram

Calvin7 · Jul 27, 2016

If you have 2GB of physical RAM installed, Windows is only able to report a portion of the physical 2GB of RAM depending on the devices installed, motherboard's chipset & BIOS.

This behavior is due to "memory mapped IO reservations". Those reservations overlay the physical address space and mask out those physical addresses so that they cannot be used for working memory. This is independent of the OS running on the machine.

Significant chunks of address space get reserved for use by system hardware:
•BIOS – including ACPI and legacy video support
•PCI bus including bridges etc.
•PCI Express support will also reserve memory if a graphics card is installed.

madman21 · Jul 28, 2016

Calvin7 :

If you have 2GB of physical RAM installed, Windows is only able to report a portion of the physical 2GB of RAM depending on the devices installed, motherboard's chipset & BIOS.

This behavior is due to "memory mapped IO reservations". Those reservations overlay the physical address space and mask out those physical addresses so that they cannot be used for working memory. This is independent of the OS running on the machine.

Significant chunks of address space get reserved for use by system hardware:
•BIOS – including ACPI and legacy video support
•PCI bus including bridges etc.
•PCI Express support will also reserve memory if a graphics card is installed.

If i install an 8gb stick down the line would this issue be fixed?

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2 gb of ram only 1.70 usable

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