I just ordered a sf600 platinum based on this thread. Thank you all! My PSU was also too loud... Replaced the case fan with Silent Wings 3. 
Mac Mini 2018 (i5/16gb/500gb) + Razer Core X (Silent Wings 3 120mm, Corsair SF600 Platinum PSU) + Sapphire Nitro+ 5700XT Special Edition
I have successfully installed a Corsair SF750 based on this thread. So much smaller, I didn't expect that, but it fits inside very nicely, even if it can't be fixed using screws.
It's rock silence now, thanks !
The SF600 Gold has been out of stock everywhere for quite some time now, but the platinum and the SF750 are too expensive for me. Do you think a SF450 would work for a 5700XT and MBP 15" 2018? I'm worried that it would draw too much power at idle and the SF450 wouldn't be silent.
Macbook Pro 15" (2018) + Razer Core X + RX 5700XT
Windows 10 2004 (Insider Preview Fast)
The SF600 Gold has been out of stock everywhere for quite some time now, but the platinum and the SF750 are too expensive for me. Do you think a SF450 would work for a 5700XT and MBP 15" 2018? I'm worried that it would draw too much power at idle and the SF450 wouldn't be silent.
That's why I've bought a SF750, to be sure it's silent. At the same power consumption, as you said, the SF450 will probably be more noisy, as the semi-passive mode in expressed in percent of the capacity.
@kisscoool18, an SF750 would be nice, but it's way too expensive for me, guess I'll just wait for the SF600 to come back in stock
Macbook Pro 15" (2018) + Razer Core X + RX 5700XT
Windows 10 2004 (Insider Preview Fast)