Yes just pencil in the resistors and measure resistance with DMM, you got the VMEM and the VGPU section the wrong way round on that image.

If I were you I'd try using ATI Tool to change the VGPU (if possible) on your current X1950Pro card and see how high the card can clock before deciding if it's worth getting a better cooler for your card.

This long thread might help for those with standard X1950 Pro digital VRM boards:
http://forums.techpowerup.com/showthread.php?t=25301