@cbuchner1
2GB config made for testing purposes only, so no harm done, 4GB were mining again 15 mins later

Not going to change anything - both rigs are mostly used for work/gaming... so mining is done on "idle hours only"

Tnx anyway
Any idea about "browser + cudaminer = high KH/s" situation from my previous post?! Sounds stupid but happens all the time on the first rig only!
The first thing I would do check is the power savings settings. You're most likely using windows (the gaming gave it away :p) and I wouldn't be completely surprised if windows doesn't recognize an app running in the console as a priority, given a conservative power savings profile.