Any way to add 4K support to a late 2012 iMac? I have this late 2012, 27" iMac (model iMac13,2) and I want to connect that to a 4K UHD TV because I am willing to create 4K stuff.

Apparently this iMac is unable to output 4K resolution, right?

If this is true, my question is: is there something I can attach to one of its thunderbolt ports (an external video board or something) that can make this iMac support 4K for cheaper as possible?
Your model iMac offered three graphics card options:


NVIDIA GeForce GTX 660M
NVIDIA GeForce GTX 675MX
NVIDIA GeForce GTX 680MX


In terms of graphics memory these cards provided 512MB, 1GB and 2GB respectively.

Strictly speaking all these cards are capable of a maximum digital resolution of 4,096 x 2,160. However, your model iMac was only capable of 2,560 x 1,440 internal resolution, and up to 2,560 x 1,600 for external displays.

I'm not sure for the exact reason of the apparent discrepancy, so I can't guarantee there'd be absolutely no way to achieve what you want. However, I very much doubt it'd be economical to achieve.