I am not here to complain or pretend that I deserve everything in the world. I am just humbly asking to hear your honest opinions.  I have (had) an EVGA GQ 850 Gold and for some reason, it started melting the VGA port and cable. A bunch of bubbles appeared in the 8 pin cable that connects to the GPU 8 pin port. The damage extended partially to small part of my carpet; the damage could have been my whole house if it was not for my sense of smell. I called EVGA, they complied with the warranty by sending me another unit (for which I am grateful),  but I think that should at least discuss replacing my GPU. I was simply told that they are not liable for the GPU, that I should go thru the GPU warranty.....and obviously not liable for the carpet. I am wondering what would happened if the house actually would have burned down ( which was very possible and I am not exaggerating on this)? Anyway, pics attached..... Thanks!  
 
 

What gpu is it? That is vsry strange that the cable start to melt like that, and great catch on your part. Have you tested the gpu at all? Was there visible damage on the gpu?

Use two separate cabled if your card requires two 8 pin connectors or an 8 and a 6 pin.. especially if you are overclocking or using a high tier card. I wouldn't trust a wingle canle with dual 8 pin or 6+2+6, because the gpu is going to want more power than the single cable can technically provide.

Yes, I agree, but its not a particularly power hungry GPU and at that moment was not overclocking. The GPU, I used is a HD7990. According the AMD website, the recommended PSU is a 750W unit. That is the reason why I picked a 850W unit, to be extra safe. 

Bummer to see this.
Myself I always use two separate 8-Pin Cables, mostly for my own safety for what I use my cards for.
Some times I will use a single cable with One 8-Pin and One 6-Pin though but only for a short time and for testing.
What is the Make and Model of your AMD HD7990 Graphics Card?
Can you post a Photo of the Power Connectors on the Graphics Card?
 

Welcome to the forums enrique145
 
This HD7990, can draw quite a lot of power: up to 569 Watts at Full load according to the first link
http://www.tomshardware.com/reviews/radeon-hd-7990-devil13-7970-x2,3329-12.html
 
http://www.guru3d.com/art...-hd-7990-review,8.html
 
http://www.techspot.com/review/663-amd-radeon-hd-7990/page8.html
 
So, this GPU pulling up to 569 Watts at 12 Volts = 47.42 Amps on the +12 Volts
 
even a more modest load of 389 Watts at 12 volts = 32.42 Amps on the + 12 volt
 
Your HD7990 (dual GPU) would Need a PSU with the ability to cary that large +12V Amp load
 
Wires like in your picture (burnt insulation) would indicate to me a short circuit had cause excess current to flow through the wires.
 
 
 
 http://www.amd.com/en-us/products/graphics/desktop/7000/7990#
 
 
 
 

If the faulty power supply caused physical damage to GPU, they could use that as grounds to void your GPU warranty.
 
2016 seems to be the year of electronics burning/melting/blowing up.
 
 

It's the video card BIOS programming and it's voltage regulation components that dictate how much power the card is allowed to draw from both the PCIe slot and any 6-pin/8-pin supplemental power connectors.
 
Specifically, PCI-SIG (industry standard) specs dictate that up to 75W (6.25A) can be drawn through a PCIe slot, up to 75W (6.25A) can be drawn through a 6-pin supplemental power connector, and up to 150W (12.5A) can be drawn through an 8-pin supplemental power connector, at 12V..Your video card likely failed for some reason and caused that by allowing too much current (Amps) to be drawn through the connectors and the PSU happily obliged, because it could.
 
A single-rail PSU like an 850 GQ has no per-rail Over Current Protection which is great for stability, but it's a double-edged sword..A multi-rail PSU would have probably tripped the Over Current Protection before that damage occurred, that's what OCP is supposed to do..Intel writes PSU rules in their Power Supply Design Guides that should be adhered to and had done away with the multi-rail requirement some years ago due to more modern hardware demanding more power and hardware manufacturer outcry.
 
Long story short = A PSU will supply only what it's asked to supply, up to a point, by the hardware, even faulty hardware..Almost certainly not the fault of the PSU.
 
Power Supply Design Guides (and other stuff, bottom of page)
Power Supply 101: A Reference Of Specifications (PCI Express Auxiliary Graphics Power Connectors)
Debunking Power Supply Myths (Connectors and the 12V Rail Issue)

bob16314
It's the video card BIOS programming and it's voltage regulation components that dictate how much power the card is allowed to draw from both the PCIe slot and any 6-pin/8-pin supplemental power connectors.
 
Specifically, PCI-SIG (industry standard) specs dictate that up to 75W (6.25A) can be drawn through a PCIe slot, up to 75W (6.25A) can be drawn through a 6-pin supplemental power connector, and up to 150W (12.5A) can be drawn through an 8-pin supplemental power connector, at 12V..Your video card likely failed for some reason and caused that by allowing too much current (Amps) to be drawn through the connectors and the PSU happily obliged, because it could.
 
A single-rail PSU like an 850 GQ has no per-rail Over Current Protection which is great for stability, but it's a double-edged sword..A multi-rail PSU would have probably tripped the Over Current Protection before that damage occurred, that's what OCP is supposed to do..Intel writes PSU rules in their Power Supply Design Guides that should be adhered to and had done away with the multi-rail requirement some years ago due to more modern hardware demanding more power and hardware manufacturer outcry.
 
Long story short = A PSU will supply only what it's asked to supply, up to a point, by the hardware, even faulty hardware..Almost certainly not the fault of the PSU.
 
Power Supply Design Guides (and other stuff, bottom of page)
Power Supply 101: A Reference Of Specifications (PCI Express Auxiliary Graphics Power Connectors)
Debunking Power Supply Myths (Connectors and the 12V Rail Issue)

Well said Bob

Great Write Up bob16314

I guess one has to become a computer and electrical engineer to not be afraid to use a GPU and a PSU. I read 750W PSU on the box of the GPU and assumed the 850w PSU would suffice, but wrong I was. The 7990 is out of warranty, so to the garbage/recycling bin it goes. I would post pics, but there was no physical damage to it. I stopped the burning madness on time, before the 8 pin connected to the GPU melted too.  All I know is, the GPU does not work anymore since this event. Well, as soon as that replacement arrives, on sale it goes, and so the other parts of the computer. I will buy a  prebuilt computer, probably a Mac and forget about building my own computer again. It is definitely not for me.  Thanks a lot for your opinions, I really appreciate them. Good Luck!