There are lemons, even among the best. And for that reason, we have warranty.
As of melting connectors go, perhaps the manufacturing defect with the cables was the issue, rather than PSU itself. This is easily prevented by using custom sleeved compatible cables. E.g from CableMod.
I've used three different psu calculators for my system and have gotten a range from 655 to 1200 watts.
These are my current system specs: P3DV 5.3, Prosi737 Server, Wideview
Gigabyte Z390 Aorus Pro Mobo
i9-9900K 3.6 GHz (5.0 GHz Turbo)
EVGA CLC 240 Liquid / Water CPU Cooler
Gigabyte RTX 3080 10GB
CORSAIR Vengeance LPX 32GB DDR4 3600
(3) Vizio 42” HDTVs-Front surround view
12” Monitor for atc and gsx menus
Cooler Master NR600 Case
SoundBlaster Sound Card
1TB M2. (4) 1TB SSD, 1TB HD, 3TB HD
EVGA 850W psu
I use all usb outputs on my motherboard plus a pci usb outputs card
Also a 13port powered usb hub which is powering radios and navigation devices
I just ordered a Gigabyte RTX 3090TI graphics card and I don't know if my current psu has enough power. This computer is powering a home built B737-800 cockpit and don't know if my 850w psu is adequate to handle the additional draw of the 3090ti. I wiped out my savings to buy this new gpu and I certainly don't want an inadequate psu to damage my system. I'm not interested and can't afford overkill but can you give me a safe recommendation for a psu if I need to replace the 850w?
If you replace your RTX 3080 with RTX 3090 TI, then additional power draw increases 100W. Here, the RM1000x would suffice, since it would give you more headroom wattage wise and it is also better build quality wise. Age wise, both (GQ850 and RM100x) are same, seeing release in 2015.