That's because ATI decided not to support the 38xx series cards for OpenCL. You need at least a 4xxx series card and I'm not sure all of those are even listed. I think I posted a link for the ATI OpenCL supported systems earlier in this thread.
Ahh, not supported. I thought all double precision cards were good. Thanks for the update. Back to Collatz with it.
The problem is that ATI didn't fully implement OpenCL in its cards until the 5xxx series. So Double Precision can only work with apps coded with ATI's CAL/Stream API not OpenCL.