Here is the complete list (As far as I am aware) of ATI & Nvidia cards that can be used to crunch GPU capable projects. The thumbnail graphic will open the full size image in a new tab or page.
BOINC GPU Compatibility List is a Google Docs spreadsheet here (Link)
The Google spreadsheet will allow the viewer to print it or download the page in any of the following formats: HTML, OpenOffice, Excel, PDF, Text or CSV. To download click on File > Download as > [Select Format]. To print click the printer icon under the File Menu.
Here is the list of all BOINC Projects that offer GPU apps
Albert@Home - [ATI & Nvidia] (*3)
Collatz Conjecture - [ATI & Nvidia]
DistrRTGen - [ATI & Nvidia] (*2)
Donate - [ATI & Nvidia] (*2)
DrugDiscovery@Home - [ATI & Nvidia] (*2)
Einstein@home (Subproject: Arecibo Binary Pulsar Search) - [Nvidia]
GPUGrid - [Nvidia]
The Lattice Project - [Nvidia] (*2)
MilkyWay@Home - [ATI & Nvidia] (*1)(*2)
Moo! Wrapper - [ATI & Nvidia]
Poem@Home - [ATI] (*2)
PrimeGrid
Sub-project: Cullen/Woodall Prime Search (Sieve) - [Nvidia]
Sub-project: Genefer - [Nvidia]
Sub-project: Genefer (World Record) - [Nvidia]
Sub-project: Proth Prime Search (Sieve) - [ATI & Nvidia] (*2)
SETI@home Beta (Enhanced) - [Nvidia] / (Astropulse) - [ATI]
World Community Grid
Sub-Project: Help Conquer Cancer - [ATI & Nvidia]
Notes:
*1) Apps require GPUs with Double Precision (DP). Refer to GPU list for cards with DP.
*2) OpenCL apps for Nvidia require Compute Capability 1.3 or higher. OpenCL apps for ATI require HD 4xxx series cards or higher for Single Precision and HD 5xxx series cards or higher for Double Precision.
*3) BOINC 6.13.10 (and newer) is required to detect openCL capability on the host.
Please send me a PM for any additions or corrections and I will update the image and the spreadsheet when time allows.
Hope this helps.
Peace.