Hi, MaLd0n, thank you for your response! I unchecked the RTC patch, but no overclock was detected either.
Here my files.
As I said before, everything looks like in normal working condition, except overclock. I overclocked my CPU (Xeon E3 1220 v3) to 4,2 GHz increasing the FSB to 120MHz. macOS shows and behaves with the stock clock (3,10GHz, Turbo Boost 3,50GHz), as tested with Intel Power Gadget and Geek Benchmark, which doesn't change my scores, proving OC isn't working.
If I set FSB manually to 120000 inside CPU tab in Clover Configurator, the OC is recognized, the scores and benchmarks changes, but audio breaks and glitches, making it impossible to hear music, watch videos etc. Looks like a synchronization issue. In Windows the OC works normally.
Send me Mac-Pro-DB85FL.zip