I don't think there are any GPUs in a Mac that could push 8k yet, maybe the Vega Pro? The RX 580 technically maxes out at 4K (according to AMD), so Apple must have some magic sauce for it to push 5k in the new iMac. The models shipping with the 550 and 560 will really be pushing it. Even the most of the high end cards out now, including the Titian Xp and GTX 1080ti, max out at 7680x4320@60Hz. That would push those cards hard for any real work.
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