GTX 275 O/C, FS9?

I am using an EVGA GTX 275 with FS9 The default settings are factory set to 648/1458/1188. It's easy to overclock (with everything synced) to 680/1520/1188 which is a 5% overclock. I can experiment with going higher, but my question is whether I even need to bother with overclocking for FS9? Will it make any difference, and if so in what way (cloud draw, etc.)? My specs are in my sig. and thanks for your thoughts.

Edited January 21, 201214 yr by Chuck Dreier