The day came hardware upgrade. I used earler 4770 GA-z87x-oc, 16gb ddr3. Read the entire forum thread and changed the config (put imac 18.2, etc.), add the necessary kexts and drivers posted in the forum, put settings in BIOS. After the launch it worked without reinstallation !!! But no sound and wi-fi (Broadcom BCM94360CD), but should work out of the box. I enter in BIOS and changed settings of pci-e (on z87x, too, it was tweaking the settings and everything worked). But this time not only did not earn a Wi-Fi, but refused to turn on the computer. In -v mode error - does printf work? and if loaded in a safe mode - bsd process name corresponding to current thread unknown. For a very long time I tried to understand what was happening, I already updated to F8 from F7 BIOS. No effect. Then in the options set SATA port to AHCI. After that, everything worked! Why without it everything was loaded initially, but at some point everything changed? I don’t understand. After clean installation, I the update to 10.13.4 and Nvidea driver (387.10.10.10.30.106). And what can I tell you? The drivers are terrible!!! Everything twitches and lags, it is impossible to work. After reading the forum I realized that the problem is in the driver version. With the help of the program (Install webdriver.sh), I can install any version of nv with the current version of HS. All works well with NV 378.10.10.10.25.104, but not excellent. There are no lags, but there is no smooth of interface too. Therefore I am thinking moving to the Vega. The next problem with the sound. After running MultiBeast there is no sound in the front headphones. After running the toleda command does not start on dsd process.... After the next reinstallation HS helped ALC1220 (via MultiBeast), Lilu kext and layout 11. Sound now works well! I continue to test the new system. Slip works, LED on the motherboard turns off during sleep. The indicator at the power button is burn during the slip, although it was turned off on the previous system. No problems with the noise of the coolers. I do not see any special problems in the system. Thank you all for the detailed information!