Mac OSX minimum spec?

I have a 9 year old Mac Pro: (2x2.8 Ghz Quad core Intel Xeon. 14gb Ram)

I guess I need to upgrade.
I do simple A and B roll editing with occasionally some motion graphics and grading.
What would you say was the minimum spec I should look to get to run Resolve.
I'm thinking of a used 27" iMac

Thanks for any advice.

Which model MacPro exactly is that? 3,1 or 4,1 or 5,1?
The latter two can be upgraded quite well for serious work.

If you go the iMac route, get a model with 4 GB VRAM to be future proof.

Which model MacPro exactly is that? 3,1 or 4,1 or 5,1?
The latter two can be upgraded quite well for serious work.

Very true the 4,1 (2009) can still be upgraded to a powerful Resolve machine.
there are CPU, RAM and GPU (flashed or not) upgrades available for it online