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Old 2019-11-14, 16:35   #482
VBCurtis's Avatar
Feb 2005
Riverside, CA

11·383 Posts

Henry is right- GPU-ECM is the same speed with any input within its bounds (1019 bits or smaller). So, it's relatively a waste of time for small numbers, but quite nice for 900+ bit inputs. When I had a working CUDA setup, I used it for lots of 900-1000 bit inputs. Even in your test case, it doubles the production of a quad-core by doing stage1 on GPU and stage2 on CPU (with a couple cores left over, since stage 2 runs faster than stage 1).
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