C.
No CPU, only the GPU(s), as your CPU won't make a lot of points but uses a lot of power comparatively (PPD /W) and slows down the GPU a bit, too (see posts directly above yours). Each GPU needs one full core for best results. You can run B, but, to me, it's not worth the PPD for the W used.
No CPU, only the GPU(s), as your CPU won't make a lot of points but uses a lot of power comparatively (PPD /W) and slows down the GPU a bit, too (see posts directly above yours). Each GPU needs one full core for best results. You can run B, but, to me, it's not worth the PPD for the W used.