I don't about the ET750W in detail, but pretty much any big brand name 750W is fine, so don't worry about your PSU it's fine.
You have a very nice build, I have i5-9500k w/ Z370 and rtx 2070 OC, and have a thermalright silverarrow 2x140mm CPU cooler. At 1st I thought it was no good w/ i5-9600k, but it was my bad overclock. Turns out it's just fine. In fact it's an excellent cooler, as I already knew from years of use. I use around 1.25V for 4.5GHz 24/7. I should find the lower limit of the voltage for this OC, but I hate running P95.
Last edited by Kaltenbrunner; 04-25-2019 at 11:23 PM.