A new GPU app is being trialled at POEM on their test server. This one is showing great promise & has high GPU usage unlike all other past GPU apps.
I tried a few on a HD 7970 and they were taking under 5 mins to complete with 96% GPU usage running just one at a time. For an openCL app they use very little CPU resources also (0.8 cpu cores) and in reality use much less than that. While the production app will probably be longer it's a good start.
Please give some a try & see how they behave on your GPU.
If there's a problem leave a post at POEM so they can start to work on a fix & Let us know here also if you like.
The new app is talked about on the home page.
http://boinc.fzk.de/poem/As before you'll have to attach to
http://int-boinctest.int.kit.edu/poem/ to try the new guys out.
PS Hopefully they will finally fix this bug once & for all but for now it seems the old openCL/ POEM problem is still in play, IE the new app still won't run on two Nvidia cards at once. An exclusion will be needed to be set in cc_config file in boinc data directory. ONLY applies to people with more than one Nvidia GPU in there systems. People with 1 GPU or 2 or more AMD cards or 1x AMD & 1x Nvidia cards should have no problems.(touch wood)
PSS. At the moment app is throwing computation errors on my GTX 970's :(