Ubuntu 10.04 eats more than 500MB of memory

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http://askubuntu.com – After installation System monitor shows that memory usage is over 500 MB - pure system after start. There are no processes which use more 20 MB of memory. Other versions of Ubuntu used about 200 MB. I'm using 64bit version. Intel i7, 16 GB of memory. What's going on? What process are eating my memory? (HowTos)