Hi guys, never done this sort of thing before but I have an issue. I own a late 2013 21.5” iMac and recently purchased a monitor to edit my photos (I’m a photographer). The monitor I purchased was a 32” HP Pavilion. When I connected my iMac to the monitor I was only getting 1080p resolution instead of the maximum for the monitor which is 2560x1440. After looking into it a bit I realised it was due to my iMac. I tried the monitor with my more up to date 2017 MacBook Pro and it worked a treat. However, I’m losing significant RAM by using my MacBook which is effecting my editing. My question is, would I be able to upgrade the graphics card in my 2013 iMac and would this mean I’d be able to maximise the resolution with the monitor? How much would this roughly cost or is it worth upgrading my main iMac altogether? Thanks.