Tech ARP has just posted the NVIDIA GeForce 9600 GSO to NVIDIA GeForce 8800 GTS 512MB Mod Guide.
3 years ago, ATI and NVIDIA graphics card line-up was not as complex as it is today. Many of their graphics cards were actually using the same GPU, so enthusiasts could mod their lower-end cards, using software or hardware methods, into higher-end graphics cards.
When ATI and NVIDIA began using many different GPUs for different product lines, graphics card modding fell out of favour because enthusiasts could only overclock their graphics cards to maximize their potential.
However, a method for soft-modding an NVIDIA GeForce 9600 GSO into an NVIDIA GeForce 8800 GTS 512MB has been found. This mod instantly gives you a GeForce 8800 GTS 512MB card at half the cost!