device ID is found in device manager in control panel, navigate to display adapter, then properties, then detail tab, and choose Compatible Ids for property
PCI\VEN_1002&DEV_68B8 <--- this line here
DEV_68B8 <--- and add this to your riva tunner.cfg file (not this in the message, the one in your computer) in [VEN_10DE]
next you need to identify your graphic card
(this is the config for ATI 5770)
DEV_68B8 = "ATI Radeon HD 5770" in [VEN_1002]
then you should be able to view the information for your GPU in GPU Meter gadget
here:
http://gallery.live.com/liveItemDetail.aspx?li=0ae2038e-03c6-4454-9729-1bfd6626cc4c