Ubuntu 12.04: Missing RAM and Unsupported hardware driver issue

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http://askubuntu.com – I've just install ubuntu 12.04 64-bit on my new PC: MoBo: Gigabit F2A75M-D3H CPU: AMD A6 5400K Ram: 2*4GB 1st problem From BIOS, I can see 4096 MB RAM installed but from System Monitor are detected only 3.3 GiB. 2nd problem in a bottom right corner, appear a logo "AMD Unsupportde hardware". I've tryed to follow some procedure (sudo apt-get install fglrx-updates --- then reboot) but doesn't disappear. Ubuntu find drivers by it-self, "fgrlx ATI/AMD" and ""fgrlx ATI/AMD" post-release" but I can install only the first... the second one, failed during installation procedure. Do you have an (HowTos)