My graph card is quadro 4000, open the opencl of pyro, the result
is only upspeed 20%, not 10 times of official reports

there are a lot of factors that contribute to the speed-up with opencl
one is e.g. the size of your sim,

e.g. if the fields of your sim are larger than the ram of your card, that will slow it down.

maybe post a hip and someone could point you in the right direction

Seb