Tecra A8 PTA83E - only 3.3 GB recognized by 64-bit systems

Hello

I have a Toshiba Tecra A8 PTA83E, recently, I inserted 2x2gb DDR2 PC6400 (800 Mhz), my laptop supports only PC5300 (667 Mhz), memory works well, but under ubuntu (x 64) I see only 3, 2 GB, WIN 7 (x 64) and in memtest 3, 3 GB. Why this behavior? Is because the modules of memory has a greater frequency than those who support the laptop? If I insert a memory module(2GB) at a time I see 1, 9 GB. Thank you.

Hello

I guess that the other part of the main memory is shared by the graphics chip.
What value memory appears in the BIOS?

If the 4 GB are indicated, then everything should be OK.

Tags: Toshiba

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