iMac Mid 2011 21.5" Hardware Upgrades

[Bobbesteijn]

With this hardware Monterey 12.1 works fairly fast, I also tested with Unigine Valley benchmark, furthermore most applications work and you can use most office projects, Numbers / Pages work well with me. For playing games I have no idea, never play games.

Unigine Valley Benchmark 1.0​

FPS:	11.9
Score:	498
Min FPS:	6.9
Max FPS:	19.2

System​

Platform:	Darwin 21.2.0 x86_64
CPU model:	Intel(R) Core(TM) i7-2600S CPU @ 2.80GHz (2793MHz) x8
GPU model:	AMD Radeon HD 6750M (512MB) x1

Settings​

Render:	OpenGL
Mode:	1920x1080 fullscreen
Preset	Custom
Quality	Medium

 

[Nguyen Duc Hieu]

Installed the Nvidia GTX 765M, boot normal, but is very slow, Monterey 21,1 didn't see the graphic card right, sees it as a videocard with 8(MB!!!!!),doesn't see the card as a Nvidia GTX 756M 2GB . Installed the AMD Radeon HD 6750M 512MB back and works oke!!.

1. Backup your current EFI folder.
2. Rebuild the EFI folder with nVIDIA option. (HD6750m is legacy)
3. Overwrite to the hidden EFI volume and reboot to see if the graphic card is recognized and works.
4. If it still doesn't work, restore the backed-up EFI from 1. above and put back the HD 6750.

 

[gorslawa]

With this hardware Monterey 12.1 works fairly fast, I also tested with Unigine Valley benchmark, furthermore most applications work and you can use most office projects, Numbers / Pages work well with me. For playing games I have no idea, never play games.

Unigine Valley Benchmark 1.0​

FPS:	11.9
Score:	498
Min FPS:	6.9
Max FPS:	19.2

System​

Platform:	Darwin 21.2.0 x86_64
CPU model:	Intel(R) Core(TM) i7-2600S CPU @ 2.80GHz (2793MHz) x8
GPU model:	AMD Radeon HD 6750M (512MB) x1

Settings​

Render:	OpenGL
Mode:	1920x1080 fullscreen
Preset	Custom
Quality	Medium

===========================

Second life - it works better than catalina!
Installation Instructions

Creating macOS Installers | OpenCore Legacy Patcher