Run 3DMark. See this thread: https://forums.macrumors.com/posts/18183445/
Managed 8518 in 3D Mark '11 with a 230/370 overclock.
Sold my iMac to get an even better desktop, so I can't
Anyone up for running passmark?
If you sold your iMac I'm not sure I understand why you would care? Am I missing something here?
I want to buy the new one, but I want to know what to expect performance wise. I might also wait for the new Mac Pro, and depending on how they compare go with one or the other or both.
If you look in the linked thread, you'll notice that there are 680MX (overclocked) vs. 780M (overclocked) figures in there.
To make it easier: the 680MX, overclocked, is pretty much 1:1 with the 780MX, since the 780MX seems to be voltage constrained at higher clocks.
So it will either be slightly slower than the iMac 780MX or nearly twice as fast (10400 passmark).