There are a few questions you didn't answer that might help out.
What settings do you have on for EQ? models, texture quality/compression, sound, dynamic lighting, resolution, ect...
Are you running EQ in a window or full-screen?
Is EQ set to run the same refresh rate as your desktop?
If you open your nvidia control panel (located inside windows control panel),on the left hand side of the nvidia window there should be a "3D Settings" tree. Expand it, the click on "Monitor Temperature Levels". It should open a new window. On that window in the lower right corner there is a button with "->" on it, click it to view the GPU monitor. You want to keep your temps below 90 degrees C while playing games. Leave that open and boot up EQ, let it run for a few mins in game, then quit EQ and see where the monitor had your temp spike to while playing. This should tell you if you are having a cooling issue or not and will rule out just about everything hardware wise as the problem.
Since you reported no problems with 3dmark06, your speaker shouldn't be causing an issue even though it is right next to your tower...I would still think on moving the sub to at least the other side of your leg space than where your tower is because of the large magnets in subs that can cause data loss/corruption on hard drives when they are too close.
depending on your EQ settings, you should look at turning the game down to 800x600, turn off all models, clear all check boxes on the screen after the models, and change the texture level to low. once that is done, run EQ in full-screen mode if it's not(alt+enter at the login screen should change between windowed and full-screen modes). If you had to change modes, exit EQ and re-run it to make sure all the settings and screen modes are applied correctly. try logging in and see if your graphics are still messed up. if they are, double check the refresh, resolution, and bit depth in game by pressing alt+O, clicking the display tab, then clicking video modes. Also under the display tab, click the advanced button in the lower right and turn off all options and reduce dynamic sky to tiny(32), sky reflections update interval to once per minuet, and shadowclip plane to the far left.
If your EQ graphics are still messed up, my money would be on corrupted EQ files so un-install/reinstall. If it works after the above, then start turning things back on one at a time until it stops working and you will know your culprit. Odds are it would still mean a corrupted file somewhere as I know several people who play with a 7800GT, so you might still want to redo EQ and see if you can crank things back up. Keep in mind my comment on subs and thier magnets, I had a similar issue with my 5.1 surround sound until one day I got fed up and removed the sound system, hooked it up to my TV, and suddenly my randomly corrupted file problem went away.
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