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quadboon
Journeyman III

hd6970 and hd6990

please, can someone explain me why my code works faster with uint8 on hd6970 but on hd6990 uint4 is faster? they use same hardware architecture...

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quadboon
Journeyman III

bump! no one experienced these problems?

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quadboon,

A lot depends on the kernel code and your global worksize used.

One possible reason can be that while using int8, you are able to generate enough wavefronts to keep a 6970 busy. But 6990 has double the number of cores and you might be able to get more performance by increasing your global worksize or usgin int4 instead ot int8.

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