Not long ago there was a discussion about how to setup a backup project.
For some reason I took a look into the version history of BOINC and I found this:

Version 6.10.19 - 6.10.56 ¶

released: 24 May 2010 NOT COMPLETE


* New: Added ability to ignore specific GPU cards through the use of ignore device through the use of a configuration file option

* New: Snooze GPU option off of the system tray menu
* New: Adjust GPU activity settings via the advanced view activity menu
* New: Added ability for a project to be specified as a "Backup Project" by setting its resource share to 0

* Fix: Numerous CPU/GPU scheduling fixes
* Fix: Numerous work-fetch fixes

* Fix: Recover from crashes in Nvidia and ATI GPU functions (Linux, Mac)

Just wanted to inform you.

Regards
Alexander

That features requires a project to be running an equally new boinc server. Otherwise you're unable to set the resource share to 0.

I was looking for infos about what cuda23 means.
A link in a link .... brought me to this page:

[url] http://folding.typepad.com/news/2010/08/memtestcl-a-gpu-memory-tester-for-opencl-supports-ati-and-nvidia-gpus.html[/url]

This is a link to
MemtestCL -- a GPU memory tester for OpenCL (supports ATI and NVIDIA GPUs).
It also links to
StressCPU v2.0 - Gromacs Based CPU Stability Tester

Might be of interest some time.

Regards

Alexander