More executions happen in Hawaii -

AMD's Radeon "Hawaii" GPU is likely to have more execution units than previously believed and may have 3072 Stream Processors.

According to XbitLabs, AMD's latest code-named Hawaii graphics processors may feature more stream processors than officially advertised.

A leaked die-shot of AMD Hawaii has revealed that the graphics processor can feature more execution units than are enabled even in case of the flagship Radeon R9 290X.

This means that a fully-fledged Hawaii will have 48 compute units, or as many as 3072 stream processors (SPs), 192 TMUs and 64 ROPs.

At the moment it is not clear if the Hawaii die-shot is correct or not but it does seem to be a good bet.

AMD sells two graphics cards based on Hawaii GPUs. The first is the Radeon R9 290X with 2816 stream processors or 44 compute units, 176 texture-mapping units and 64 raster operating units. Then there is the Radeon R9 290 with 2560 stream processors, 40 CUs, 160 TMUs and 64 ROPs.

AMD is yet to announce a specification of a fully unlocked Hawaii graphics chip and has never officially demonstrated a die-shot of the GPU.

Looking at the leaked die-shot, it would appear that the graphics processor can feature more execution units than are enabled even in case of the flagship Radeon R9 290X. By adding up the numbers and dividing by your shoe size you can guess that a fully-fledged Hawaii sports 48 compute units, or as many as 3072 stream processors, 192 TMUs and 64 ROPs.

If this is all true then you are left wondering why AMD disabled them. XbitLabs thinks that it can only be to ensure steady supply of Radeon R9 290X even if there are problems on the manufacturing side.

Since it is hard to produce highly-complex chips with all execution units working perfectly and at desired clock-rate, GPU designers disable certain units to boost the number of chips that hit performance targets and can be shipped to customers.

AMD is, of course, saying nothing.