Now this double precision mockery seems to have no end. For top end Fermi based GPUs the ratio was 1/8 which was just acceptable. For the rest Fermi GPUs the ratio became 1/12. Thereafter, Kepler further reduced it to 1/24. And today we learn that the first Maxwell GPUs further cut it to 1/32!
As long as NVidia wants to sell as more Teslas as it gets we will never be able to achieve acceptable performance in double precision arithmetic from consumer cards. Actually, using a consumer GPU (excluding GTX Titan) for a compute intensive problem does not worth considering the CPU improvements with 256bit AVX2 plus the addition of FMA instructions. And certainly not everyones has 1000$ to waste for a GTX Titan. I would expect a decent double precision performance from a mid-range card of, lets say 300$, but unfortunately that's not the case.
I hope the next architecture dubbed Volta will not emply a 1/128 ratio though it doesn't actually make much difference if it is 1/32, 1/64 or 1/128. These ratios turn double precision compute on consumer cards meaningless.
Source: http://www.tomshardware.com/reviews/geforce-gtx-750-ti-review,3750.html#xtor=RSS-182
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