After 1.65v to get 1.7v connect the 2 points with conductive ink shown below.
To get 1.8v, do both step 1 and 2 and you get 1.8v!
Cool well! These cards use the 4 hole Dimensions similar to the 6800 and 7800/7900. I use a homebrewed brute force approach:
Runs so cool, with the heatsink mod, I just get 34C idle!