Quote:
Originally Posted by jeffwalker
Okay, thanks.
I'm using a mid-2011 27in iMac which won't update beyond High Sierra, hence the question.
Currently I lack the resources to buy a new 27in iMac.  |
If you buy a new video card (replace the GPU) for your iMac, you can use the Catalina patcher to install Catalina on your iMac.
http://dosdude1.com/catalina/
The following is form the Known Issues section of the Catalina patcher site.
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AMD/ATI Radeon HD 5xxx and 6xxx series graphics acceleration: Currently, it is not possible to achieve full graphics acceleration under Catalina on any machines that use a Radeon HD 5xxx or 6xxx series GPU. If you have a machine with one of these GPUs installed, I'd advise upgrading it if possible (can be done in 2010/2011 iMacs, iMac11,x-12,x), disabling the dedicated GPU if using a 2011 15" or 17" MacBook Pro (MacBookPro8,2/8,3, instructions to do so can be found here), or not installing Catalina. Running Catalina without full graphics acceleration will result in extremely poor system performance.
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It says you can replace the GPU on your 2011 iMac.