Mikhailtech posted a review on the Palit Geforce 9600 GSO Sonic 768MB Video Card

The GSO chip has only 192bit memory interface bus compared to the 9600GT, but has more stream processors than the 9600GT, 96 of them instead of 64. These 2 differences can be saw in different 3d applications. Usually, if the memory bus has less bits, it has some problems when the applications are ran with AA on, and work pretty good with the AA off, but we will see this in detail, in the test section of the review.

Palit Geforce 9600 GSO Sonic 768MB Video Card Review