sreschwamm

specs of the 5470

Discussion created by sreschwamm on Sep 1, 2011
Latest reply on Sep 9, 2011 by bridgman

just one question regarding the design of the radeon mobility hd 5470.

according to the evergreen instruction set architecture document a SIMD engine contains 16 thread processors with five stream cores each, totaling 80 stream cores per SIMD engine.

As the HD5470 has 80 stream cores, that would translate into 1 SIMD engine.

But if I query the device capabilities by using

clGetDeviceInfo(device_id,CL_DEVICE_MAX_COMPUTE_UNITS,sizeof(di),&di,NULL);

the result is 2 compute units which would mean that each SIMD engine has 8 thread processors with 5 stream cores each.

Can anyone clarify how many compute units (SIMD engines) with how many thread processors the HD 5470 has?

 

 

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