So basically it's a combination of the following: Recent Nvidia Drivers + Windows 10 Fall Creators Update + Fast Start enabled in power options. Also did a shutdown/turn off PSU and drain power/ cold boot and no audio crackle.
When I saw the text on the fast start option "Restart isn't affected" I instantly thought this might fix it finally?! So I disabled fast startup, did a shutdown and startup and no audio crackle.
Just a little bit ago I saw this thread on PCMR: I've known for like a week that rebooting the system(after every boot) was a workaround that would make the crackle disappear, but first boots always had it. There may be a hardware component to this, I have a Asus Z370-F with the latest bios and a 1080ti but I've seen people with older stuff say they had the problem as well. The original issue: When the GPU was under load such as from a game, benchmark, or GPU miner, if there was any audio playing(using a source other than the HDMI/displayport audio) there would be a crackling sound in the audio.
Sample rates: 32 kHz, 88.2 kHz, 176.TLDR: Disable Fast start(hibernation) in Windows Power options. Note: The following formats are not commonly used, and consequently are not supported by the audio driver: When this happens, the NVIDIA HD audio driver defaults to the following format:īeginning with the NVIDIA graphics driver version 352.86 (HD audio driver version 1.3.34.3), the driver defaults to the following supported formats whenever it receives invalid data for the formats supported by the display: The problem occurs when the system reports invalid data for the audio formats supported by the display. Speaker configurations: Stereo, quadrophonic, 5.1, 7.1 If your high-definition audio device is NVIDIA or something else (say Realtek), there are some common solutions in Windows 11/10 computers that might work to fix this issue. Sampling rates: 44.1 kHz, 48 kHz, 96 kHz, 192 kHz. The NVIDIA HD audio driver is capable of supporting the following audio formats: Now you basically have no sound drivers on your computer left meaning you need to google and find the Conexant driver that belongs to your computer. Again, uninstall ONLY the Conexant smartaudio HD. All the NVIDIA HD audio codecs since the GT212 GPU support sampling rates of 32 kHz - 192 kHz, sample sizes of 16 bit - 24 bit, and speaker configurations from stereo to 7.1. 4) When you click the arrow key, you should be able to see 2 options, Conexant smartaudio HD AND NVIDIA High Definition Audio. 
The audio formats that appear in the Windows Sound control panel depend on the formats supported by the audio codec, the audio driver, and also the capabilities of the display being used.
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