Even my 6800 GT doesn't have a temp sensor that is visible in nVidia Control Panel, it requires you to use the stupid and lame ASUS enhanced drivers and the 'SmartDoc' program. Lame stuff I tell thee.
Just search your GPU manufacturers website, as their may be a link to a 'status' program.
AMD 64 X2 4200+ @ 2.2ghz
2048mb Corsair PC3200 RAM (2x1gb)
WinFast NF4SK8AA Motherboard
660GB HDD Capacity (3xHDD)
600w Enermax PSU
eVga 8800 GTS 320mb