This iMac is in good shape and runs great! This model can simultaneously support the internal display at full native resolution and up to one 5120x2880 (5K) external display at 60 Hz with support for one billion colors; two 3840x2160 (4K UHD) external displays at 60 Hz with support for one billion colors;or two 4096x2304 (4K) external displays at 60 Hz with support for millions of colors.
eBay