Point sprite sizes on 300 series nvidia drivers

We have software that was rendering point sprites larger then 64 pixels across on a 580 card, however when we tested it on a 680 with 300+ series drivers, the point sprites got clamped at 64 pixels across. Is there any way to work around this without changing code (it is older software that probably cannot be changed). I am not too familier with the inner workings of the program but I do know they are processed and drawn with Cg shaders.

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