![]() OCLP is working on preparing beta support for Mojave/Catalina, hopefully soon. As to whether other patchers add support for Terascale 2 GPUs or whether Monterey support comes for these iMacs with stock TS2 GPU that remains to be seen. OCLP is working on preparing support for Mojave/Catalina, but that's just for developer use. I’m yet to test Big Sur with a TB3 dock, but think it should work. I’m using OCLP with a mid-2011 iMac using the stock hard drive. ![]() So finally these Macs with stock GPU are usable on a newer OS than High Sierra. Open Core Legacy Patcher 0.1.7 (and newer) has beta support for graphics acceleration with the stock Terascale 2 GPU in the mid-2011 iMac with Big Sur. So my dock requires at least Sierra and my TB3 enclosure requires at least High Sierra so I need to run at least High Sierra. Note you need to run an OS supported by the dock and the drive/enclosure, whichever is newest. My setup is mid-2011 iMac -> Apple TB(1/2) cable -> Apple TB3 to TB2 adapter -> TB3 dock -> TB3 cable (supplied with TB3 NVMe drive) -> TB3 NVMe drive. The USB3 drives wouldn't be bootable though, I think, except off the iMac's USB2 ports. I haven't yet tested USB3 with the dock for file transfers but presume that should work fine. Doing so is slightly faster than with a single internal SATA III SSD.
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