Bad Vid Card?

[Orruar]

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After playing for some time, the graphics will go buck wild. The textures get all screwed up (notice the block of spell icons on the side of a hill). Note that mobs, pets and players all show up normally, with no texture craziness. If I continue for much longer after this happens, the entire machine freezes up and I have to do a hard reboot. This only happens while playing EQ, though I don't use this computer for much else.

This started a few months back and I read at the time that it may be heat related. The fan works fine, so I cleaned out the vid card real well at the time, and the problem went away for a few weeks. Problem cropped again and cleaning has not helped at all. I have also updated to the latest nVidia drivers. So is this just a bad card, or is there something else at work here?

Card is a GeForce 8800 GT, about 3 years old.