GeForce 8500 GT Inno3D 1GB Edition is a special edition of the middle-class GeForce 8500 GT. See the page of the standard version for more information.
The new features include a small OC on the core-clock that went from 450MHz to 460MHz. The video memory size was increased to 1GB but that may prove useless, since high video memory usages results from gaming at extreme resolutions and using techniques like AA, MSAA. Due to its architecture limitations (in the core G86) GeForce 8500 GT Inno3D 1GB Edition is not powerful enough to process that much information.
The performance boost is very reduced and so Very Demanding games will require very reduced settings while modern, demanding games will run fluently from low to medium settings.