A PS3? Do you mean a DS3?
It fits on a DS3 mobo. But the 9500 is not best cooling option.......there are others that are better, quieter, and cheaper. Other than the nice look of it, not sure why you'd want a 9500.......pick something else, there are some good options.
Options.........depending on whether you want pure performance, silence, or a mix of the two, here are some:
-Zalman 9700
-Thermalright Ultra 120 (needs a 120mm fan)
-Arctic Cooling Freezer Pro 7
-Noctua NH-U12F
-Thermaltake Big Typhoon
-Tuniq Tower