opengl - float vs double on graphics hardware -

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i've been trying find info on performance of using float vs double on graphics hardware. i've found plenty of info on float vs double on cpus, such info more scarce gpus.

i code opengl, if there's info specific api feel should known, let's have @ it.

i understand if program moving lot of data to/from graphics hardware, better use floats doubles require twice bandwidth. inquiries more towards how graphics hardware it's processing. understand it, modern intel cpus convert float/double 80-bit real calculations (sse instructions excluded) , both types equally fast. modern graphics cards such thing? float , double performance equal now? there strong reasons use 1 on other?

in terms of speed, gpus optimized floats. i'm more familiar nvidia hardware, in current generation hardware, there 1 dp fpu every 8 sp fpu. in next generation hardware, they're expected have more of 1 2 ratio instead.

my recommendation see if algorithm needs double precision. many algorithms don't need bits. run tests determine average error going single precision , figure out if it's significant. if not, use single.

if algorithm purely graphics, don't need double precision. if doing general purpose computation, consider using opencl or cuda.


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