Can I install Radeon HD 4850 to my mid 2010 27" iMac?

Yeah, I want I use his patcher, but system compatibility says “iMac11,x (systems with AMD Radeon HD 5xxx and 6xxx series GPUs will be almost unusable when running Catalina.“. I’ve checked different forums and it seams like it’s actually no way to use a patchers for my 5670 GPU. Same time patcher should work for 4xxx

Ok I double-checked on macrumors forum and one guy confirmed that he installed Catalina with patcher on his 9.1 iMac with HD4850.

So my question is still open. Can I actually install that GPU to my iMac 10.3? Seams like it should work, but I want to make sure and get a confirm from somebody who has more experience in this field than me

Here's a rundown on the performance of the two boards:

● Radeon-HD-5670

● Radeon-HD-4850

Personally, I don't see enough of a difference here I personally haven't tried using either of these GPU's with with a patched Catalina so I can't tell you more.

Apple P/N: 661-5314 MXM III, ATI Radeon HD, 4850 512 MB. You'll have issues with the heat sink at the 27" unit is bigger. Remember you need a MXM 3.0 board not a standard PCI/PCIe board.