Why are CUDA/Stream cores disabled?
What I don't understand is why cards like the 780, which is as far as I know very similair to the 780Ti, have cores disabled? Same goes for 290 and 290x, aren't they basicly the same chip? Why does the 290 have stream cores disabled? Apart from the power delivery and such why are those cores disabled on cards? And does the known 290 to 290x flash enable these cores, if so why would that work and why do the 290 ones have disabled cores? And why do they laser off cores on some chips, like nVidia does it? Would that just add cost for no good reason, I mean isn't flashing your card your own risk (a part from the fact that only a few do it)?
The GTX780, GTX 780ti, and the GTX Titan all have one GK110 GPU core. The main differences between all of the cards is that the higher end (GTX 780ti) has all of the cores enabled while the GTX 780 has some disabled. This is done because when the GK110 is made there is a chance that every core fails to meet certain requirements. If not met, Nvidia can see this in testing and will cut off the cores until the GPU is stable. Some of the GPUs may not reach stability and be recycled, some may be only slightly weakened and pushed to lower end cards, some may be perfect and send to the highest end cards.
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