I had oportunity to test ATi HD 4xxx series card today, and it seems the only example it is able to run from those I posted and run ok on GeForces, is that about with device info. That is quite bad.
I was not allowed to install latest drivers and ATi SDK there, so this is situation for SDK 2.0.
I hope it will be possible to test in next weeks.
If anybody has friends with ATi Radeon HD 4xxx/5xxx and could try to run the OpenCL samples from here, I would appreciate it a lot.