The 9500 GS is an OEM card that is based on the 9500 GT but geared towards the mainstream audience.
This tactic has been seen before in products such as the GeForce 7900 GTO to clear unsold stock when it is made obsolete by the next generation.
Some manufacturers have mistakenly listed some of their 768 MB models that have 96 stream processors as being based on the G94 chip, rather than the G92.
[10] After clearing the old 8800 GS stock, Nvidia revised the specification with a new core, and 512 MB of memory clocked at 900 MHz on a 256-bit bus.
[12] The GeForce 9800 series contains the GX2 (dual GPU), GTX, GTX+ and GT variants.
Taken from an eVGA specification sheet:[21] In July 2008 Nvidia released a refresh of the 9800 GTX: the 9800 GTX+ (55 nm manufacturing process).