Why is my GPU eating up so much memory?

Hello All,
My GPU is an nVidia GTX 460.
I don't know if this is normal or not but just using my idle OS (i.e., nothing GPU heavy is running at all) my GPU is using 400+ MB of its 1023 MB. This is almost half a gig of just GPU RAM dedicated to me using Gnome 3.
I have some add-ons for the shell but I've noticed that my memory usage increases continuously, no matter if I use the extensions or not. My usage will slowly go up from 123 to like 400 without me doing anything really different.
I've been using nvidia-smi to track temp and RAM usage but analyzing individual processes isn't supported.
My driver version 319.32.
The usage never exceeds like 450 but I'm just wondering, what's eating up all my RAM? I'd like to give videogames more headroom than just 600 MBs.
Oh, and I have the nVidia settings configured to override anisotropic filtering and to enhance anti-aliasing of OpenGL applications but I've always done this stuff before and never had such high RAM usage so it may not be that. These are all maxed out, as well. I figure that it's a decent GPU so I should make it work but it's just I've never seen it eat up so much RAM when I'm not even using anything OpenGl heavy. Or maybe I am. I don't actually know which applications are GPU heavy or not. Currently, I have Terminator going, Chromium, Psensor, gedit and Clementine. Omg, is it gedit?

I feel like that topic link was more or less for system RAM while I'm talking about dediated GPU RAM. The python script works but it agrees with htop and not the output of nvidia-smi. I tried "lsmod | grep nvidia" but again, I think that's system RAM because those numbers don't add up to what is currently 305 MB.
$ lsmod | grep nvidia
nvidia 9388021 49
drm 230077 2 nvidia
i2c_core 22479 3 drm,i2c_piix4,nvidia

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com.adobe.fpsaud
at.obdev.littlesnitchd
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net.culater.SIMBL.Agent
com.trusteer.rapport.rapportd
com.orbicule.WitnessUserAgent
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com.imcapture.IMCapture.Agent.plist
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Adobe AIR.framework
AudioMixEngine.framework
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I want to ask something about firefox. why firefox use very much memory? can you develop to reduce memory comsume? this problem is very distrub in my PC with low memory.

I want to ask something about firefox.
why firefox use very much memory?
can you develop to reduce memory comsume?
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== This happened ==
Every time Firefox opened

How much memory is Firefox using right now?
# Press '''CTRL+SHIFT+ESC''' to load the Task Manager window
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sofia castello-branco wrote:
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# Shockwave Flash 10.0 r42
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Update the [[Managing the Flash plugin|Flash]] plugin to the latest version.
*http://www.adobe.com/software/flash/about/
I don't know if these three with different copyright dates are all needed:
# Version 0.9.17, copyright 2008-2010 Veetle Inchttp://www.veetle.com/
# Version 0.9.17, Copyright 2006-2009 Veetle Inchttp://www.veetle.com/
# Version 0.9.17, copyright 2006-2010 Veetle Inchttp://www.veetle.com/

Why is my GPU eating up so much memory?

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