Seems that some hidden driver info shows a 7800GS
"Some of you may doubt our sources, so to clear it up and to prove the reliability of our sources; we decided to post more details about this subject. NVIDIA stores a lot of information inside their drivers. Some of it can be found in their Setup information file (nv4_disp.inf). But some of their product's information is also stored inside the Control Panel file (nvcpl.dll)."
NGOHQ
View at TechPowerUp Main Site
"Some of you may doubt our sources, so to clear it up and to prove the reliability of our sources; we decided to post more details about this subject. NVIDIA stores a lot of information inside their drivers. Some of it can be found in their Setup information file (nv4_disp.inf). But some of their product's information is also stored inside the Control Panel file (nvcpl.dll)."
NGOHQ
View at TechPowerUp Main Site