Hi Marco,
I don’t know if I can solve your issues, but I can explain exactly what I would do in your situation. You may not like it at all though TBH… it’s a lot of work and potentially a lot of money, so please take my advice in the context of what I would personally do. I’m not Steinberg support. My approach has worked for tons of my own machines over many years. But I can’t speak in an official capacity.
1 - Consider getting a new computer. I told you may not like my advice!
The Core i7-7700K running on the Z170 (LGA 1150) is pretty old, and a current gen system will be 3-5+ times more powerful. Even a Mac Mini M2 for just $600 will be far more powerful. You are asking a quad core (eight thread) CPU platform from about 2016 to run a very advanced modern DAW from 2024, in comparison to Cubase 7.5, which is from about 2013 if I recall… all those years man… lots of things have happened with DAW engines. Give it some hardware love. I mean, the old hardware should still work. But still…
2 - ALSO, consider updating to Windows 11… keep in mind that Windows 10 EOL is coming in about one year, so you’ve got to be thinking about the future now. But… drum roll please… oops! Windows 11 doesn’t officially support the i7-7700K… so again, refer to #1 above. Time to upgrade… you can repurpose your i7-7700K machine as a great little Linux machine and run some amazing stuff on Linux BTW! That’s a different discussion though.
3 - Okay, so let’s say you don’t want to replace your hardware, this is what I would then do - a complete fresh install of Windows from scratch. New DAW with that many years of difference AT LEAST deserves a fresh install of Windows.
4 - During the fresh install, I would also take the time to test the computer thoroughly with memtest and Prime to make sure it’s 100% stable under heavy load. Test that baby like a new build. Make sure it holds up under stress.
5 - BTW, as part of that, take the opportunity to fine-tine your BIOS settings if needed. For example, if you have built-in Wifi adapter, disable it… etc. I can’t remember settings for BIOS back in the Z170 days, and I don’t know the extra features on your motherboard, but I’m sure some old guide exists for you to double check some settings.
6 - When installing the nVidia GPU driver, make SURE you are using the Studio version, not the standard driver. nVidia’s standard driver sucks for modern DAWs. Many people don’t know that and assume that the normal nVidia driver update will be the best… nope… search for the Studio driver. Also, if that doesn’t work out for you, I tend to use AMD GPUs on my Win/Linux DAWs now anyway, I’ve had much better luck with AMD. Still your 3060 TI should be okay with the Studio driver.
7 - Don’t use your DAW for anything but DAW stuff. I do NOT cross purpose my DAW hardware, ever. A DAW is a DAW is a DAW. Not a gaming machine. Not an Adobe Creative Cloud machine. Not a word processing machine. It’s exclusively a DAW. That’s just me. Again, you may not like what I’m saying.
8 - Once the proper GPU driver and ASIO driver for your audio device are installed, I would then run a DPC latency check to make sure it’s super solid for low latency audio.
9 - Now you are finally ready to install Cubase 13. I would test it thoroughly, without any extra third party plugins. As clean of an install as possible to eliminate all other possible conflicts. Fresh Windows + proper GPU driver + ASIO driver + Cubase 13. That’s it. That’s your baseline.
10 - Once that passes your own stability test – and test it hard, throw Steinberg’s own plugins at it to the max load, see how it behaves… then and only then would I install each third party plugin developer one at a time, and test for stability each time as well.
The above steps are what I personally actually would do, and HAVE done many times. It has uncovered unexpected conflicts and helped me get very stable systems, across the years, across platforms, across DAWs, with hundreds of plugins and countless huge projects.
Good luck!