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Check out Tom's Hardware Guide. Look for any reviews on the 7600GS. Also check AnandTech. They do many hardware reviews as well. This will give you a rough idea of just how far the limit is, so that you know a relative ceiling without having to find it out on your own.
I found this review, which included overclocking results. They were easily able to get a 20% overclock on the stock heatsink, which is what I am going after. I don't want a fan because one of the things I really like about my 7600GS is that it is silent. Besides, even with the 20% overclock, the reviewed card idled at 42°C and only hit 60°C at load. Those kinds of temps shouldn't require a fan, right? Mine isn't a MSI card, but it should perform much the same.
I suspect that with a 3rd party VGA cooler one could overclock a 7600GS right up to 7600GT levels.