I have already tried under Ventura to exclude some RAM benches i had 2 from 4GB to 1333 MHz and 2 from 4GB to 1600 MHz, all Hynix, keeping first only 1 and then 2 of those at 1333 MHz but nothing changed. I am trying to install Mac OS High Sierra on external SSD to understand if the processor also has problems. The procedure for updating to an incompatible Mac to Big Sur is as follows: First you will need to obtain the installation files for the operating system. I attach under what happens to me with the GPU (nvidia quadro K1000m 2 GB) even under stress. It can be done by launching the "sudo powermetrics" command from the terminal and check in the various lines (in correspondence with the various cores) "CPU Average Frequency As Fraction of Nominal: xxx% (xxxx MHZ)" If this value is blocked, as in my case, at 59% or 1600 MHz so the processor loses at least 40% of its clock speed or if the CPU work at 80-90-100% this could be due to the type of GPU that both with Ventura and with Monterey (Monterey tried on external SSD) does not provide acceleration, I believe. Who has installed Ventura on iMac 2011 21" or 27" and has a GPU Nvidia Quadro K1000 or 1100 or the 2xxx series with 1 or 2 GB or beyond, can check if the speed of the CPU is limited to only 1600mHz?
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