Hi guys, Looking for a bit of Apple knowledge. I recently bought a second hand iMac off of a friends friend to use instead of my dying out macbook pro 2012. It came with 2TB hard drive and 4gb ram but with the use of Adobe Lightoom & Photoshop the struggles soon came around. Anyhow I have just installed Timtec 2 x 8gb RAM DDR3 1333MHz & had to reboot the Mac and is currently running OS High Sierra. (It used to say it was a Late 2011 Mac but since have it back up and running and on High Sierra it now says Late 2009???) I have a Samsung 850 EVO 500GB 2.5" SSD to go in very soon. My issue now as I am looking at running Zwift on my mac and the graphics card really will not be able to handle it. These are the bare minimum requirements for it to run on Mac OS: Windows 7 x64 bit, OSX 10.8. Processor: Intel Core 2 Duo. Memory: 4GB. Graphics: 1GB dedicated GPU, or embedded Intel HD 4000/AMD R5. Hard Drive: 4GB of free space. If anyone can help in terms of what to buy to upgrade my graphics card, even if it needs to be run externally.