You can choose to suspend GPU tasks while you're at the computer using BOINC manager but doing so will cause you to lose all work after the last checkpoint.

I just got TThrottle working properly this morning and found a wonderful feature:

Under the Preference tab:
"If the computer is not used for " " seconds<-enter a sensible number here like 180 seconds for 3 minutes
Use these temperatures:
Core " "
Gpu " "

You type your desired maximum temperature for the GPU here, then under the main "Programs" tab, for "Set Gpu" enter a ridiculously low number like "1". TThrottle will now suspend GPU usage whenever you're at the computer--without losing your work like BOINC manager does!

I wonder if Fred can talk to the BOINC team and show them how he does this GPU throttling trick so they can implement this transparent GPU computing that's been on their wishlist...

I wonder if Fred can talk to the BOINC team and show them how he does this GPU throttling trick so they can implement this transparent GPU computing that's been on their wishlist...

They already know how to do it.