3Gb ram being reported as 1.9Gb

Nishith Nand mr.n.nand at gmail.com
Mon Mar 30 15:44:10 BST 2009


On Sunday 29 March 2009 16:07:10 Nishith Nand wrote:
> > I know that 32 bit ubuntu has a limit at around 3.3 Gb but I have less
> than that.
> That is a misconception.
> A 32bits system will address a Max of 4GiBs of memory positions.
> But it wont all be RAM.
> All memory alike storage have to be mapped so that they can be reached, and
> this will count stuff like HD cache (and other IOs), GPU, CPU L1/2/3 cache
> and finally central RAM.

I know that :) , and then there is PAE

> Should also note that some boards are incapable of using DIMMs bigger then
> some size, or chipset limits to the amount of address memory.
> In your case maybe you are being hit by the board limit or a faulty DIMM.
> Run memtest to be sure.

I have an ASUS A8N VM mobo, it supports 4GBs of RAM. Its detected correctly
by windows. memtest shows me 3071MB RAM.

Thanks and Regards,
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