This iMac is in good shape and runs great! 

May show sings of wear (please refer to pictures).

This Models has AMD Radeon Pro 580 graphics processor with 8 GB of dedicated VRAM.

This model is powered by a 14 nm, 64-bit "Seventh Generation" Intel Core i7 "Kaby Lake" (I7-7700K) processor which includes four independent processor "cores" on a single silicon chip. Each core has a dedicated 256k level 2 cache, shares 8 MB of level 3 cache, and has an integrated memory controller (dual channel).

This system also supports "Turbo Boost 2.0" -- which "automatically increases the speed of the active cores" to improve performance when needed (up to 4.5 GHz for this model) -- and "Hyper Threading" -- which enables four hardware processor cores and eight "threads" for software multitasking.

This model has a 27" LED-backlit 16:9 widescreen TFT active matrix "Retina 5K" display with IPS technology, a native resolution of 5120x2880, a "wide color" DCI-P3 gamut, and brightness of 500 nits.

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. It supports both extended desktop (second workspace) and video mirroring (internal display duplicated on the external display) modes.