I have decided to open a query to see if I find a solution to the low performance of the equipment.
It is a iMac 27 2009 with GTX 765M flashed by Nick, I have also put ssd of 1 Tb. The optical drive fans go full speed but with "SSD Fan Control" I can slow them down.
The equipment works well with High Sierra and Mojave but I can't get it to work with Catalina because I lose the graphic acceleration and a black screen appears that requires pressing ATL to search for the boot disk.
The iMac is somewhat slow when I do a Greekbench 5 the result is very low compared to the average.
The optical drive has been changed to an ssd where BOOTCAMP is installed and it works perfectly.
Ironically macos ox does not work well, you can see the Greekbench well below average.
Any help will be welcome.
It is a iMac 27 2009 with GTX 765M flashed by Nick, I have also put ssd of 1 Tb. The optical drive fans go full speed but with "SSD Fan Control" I can slow them down.
The equipment works well with High Sierra and Mojave but I can't get it to work with Catalina because I lose the graphic acceleration and a black screen appears that requires pressing ATL to search for the boot disk.
The iMac is somewhat slow when I do a Greekbench 5 the result is very low compared to the average.
The optical drive has been changed to an ssd where BOOTCAMP is installed and it works perfectly.
Ironically macos ox does not work well, you can see the Greekbench well below average.
Any help will be welcome.
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