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My system is Ubuntu 12.04 64 bit + Unity and it uses ~480Mb with no other processes-apps open, just the core system. Is this the expected amount? It seems a bit steep to me but perhaps this is normal behavior.

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Yes, ~480 MB is normal for a stock 64-bit 12.04 with Unity (I get similar).

Don't forget that what you call the "core" system is actually running a 3D desktop environment as well as lots of background services. Windows 7 SP1 x64 with Aero is in the same region.

This shouldnt be a problem on a system with 2gb or more of RAM If you want to lower RAM usage, consider switching to a lighter version such as Lubuntu.

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Thank you! Just wanted some confirmation. (PD: sorry for not responding your request for so long in my question askubuntu.com/questions/170035/…; I'd forgotten about it) –  Gabriel Aug 28 '12 at 17:46

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