Win7 x64 + Cat 10.10 + SDK 2.2 - only 256MB GPU memory

Discussion created by Raistmer on Nov 1, 2010
Latest reply on Dec 5, 2010 by himanshu.gautam
HD4870 reports only 256 MB memory for OpenCL

Same host under Vista x86 : GPU reports 512 MB to OpenCL (as should be).
Why 256MB limit still present for x64 SDK version?
How to avoid it for SDK 2.2 ?

Also, profiler reports almost 10 (!) time higher execution times for all kernels under Win7 x64 compared to Vista x86 (same app, same workload).

What is wrong with ATI software under Windows 7 x64 ???