Compute units and wavefront for "ATI Mobility Radeon HD 5400 Series" GPUs

Discussion created by LowProgrammer on Jan 19, 2011
Latest reply on Jan 19, 2011 by himanshu.gautam


How it is possible to have "80 Stream Processing Units" for ATI Mobility Radeon HD 5400 Series GPUs (e.g. http://www.amd.com/us/products/notebook/graphics/ati-mobility-hd-5400/Pages/hd-5450-specs.aspx) and CLInfo program to give 2 compute inits (Max compute units) ?

Assuming 5 processing elements per 16 stream cores the CLInfo must give only 1 compute unit... Except if there are 8 stream cores per compute unit… What really applies ?

Also what is the wavefront granularity for same series GPUs ? 32 or 64 threads per 4 cycles?

I cannot find any of the above information inside specifications

Thank you!