Monitors are funny like that. My 430 Watt True power 20Amp 12v rail is reading 11.43 ever since I updated to the new version of ASUS Probe. This is also when I went from a K8T800/A64 754 to a A8V 90nm Winchester. My CPU is suppose to be using less voltage, not more. So I figure it's just how my new mobo or monitor is offset.
Eitherway, I would not trust a 350watt PSU with a 6800GT and Barton. Especially if they are not like the true powers that come with 20-24AMP 12v rails that are seperated from the rest of voltage rails.