Update:
I am in the process of updating stuff to include the latest HD cards but I wanted to post this first. According to AMD's ATI Stream SDK w/OpenCL web documentation page
System Requirements & Driver Compatibility, only the HD 54xx series and up are fully supported in version 2.3 of the SDK. On that same page is a comment regarding products produced before the 5xxx series.
Quote:
This suggests that AMD Corp. will stop supporting older products altogether and probably sooner rather than later. More so if AMD decides to integrate OpenCL into all of its video drivers.
IMHO with the recent lackluster performance of AMD HD cards running OpenCL when compared to similar cards from nVidia, it is apparent to me that (I thought I would never say this) nVidia products are becoming a better alternative for crunchers as more and more BOINC projects switch to OpenCL apps. And if nVidia can learn to curb their future cards appetite for P = E x I, than nVidia might be able to bury AMD in the GPU Parallel Processing segment (i.e. Us crunchers).