The looks mean nothing tbh, but the operating specifications do.
The reference designs of the GTX have the memory and core clocked slightly higher than the GT model and The 7800 GT chip has 16 ROPs / 20 pixel pipelines and the 7800GTX chip has 16 ROPs and 24 pixel pipelines.
There's no increase in image quality, it's about performance. You will get higher FPS with a GTX, but you have to have a pretty powerful system to run it correctly...I found this out the hard way =\
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