Wow, this forum really blew up over night. I was expecting maybe a resonse or two when I woke up but there's a lot now! Anyway, to answer some of the various questions asked of me:
@Multiple People: I'm at work right now but once I get home I can take a picture of the GPU in slot 2 and I'll try to get a close up of PCI-E slot 1. I can also show the mobo error code when it's in slot 1.
@frostygrin: No, I did not increase the power limit at all.
@semitope: The overclock was while I was playing for the 7 hours. It was fully stable (no artifacting). I also thought it was wierd that my other slot didn't fry as well but according to some other posters here, the individual slot pins might get damaged. I had already tried what you suggested using some compressed air, but it still doesn't work.
@humbleliker: I'm calm because my computer still works. I'm avoiding gaming using slot 2 until this is settled. It won't be the worst thing if I have to use slot 2 going forward as long as it doesn't break as well.
Well a GPU potentially damaging PCIe slot is a very serious thing, so not sure why are you so surprised the forum 'blew up'. Looking forward to any further evidence you provide.
With all due respect, overclocking even without power limit will still significantly increase the power usage over 100w.
If you can, please try running the samething again in another pcie slot but this time, don't overclock it and don't set power limits. Non overclocked rx 480 hits round 80w which is only +5 from the advisory.
You are parroting that wrong post someone made on AMD forums.
PCIe eletromechanical specs:
16x, FULL HEIGHT card (half-height the limit is smaller, less than 16x is smaller too).
1. PCI-e slot can have TOTAL of 75W
2. The 12v pins of the slot can have at 12v in total 66W, the limit is actually in amperage (5.5A), meaning if you have vdrop, the W limit lowers too. For example, during the test of a Brazillian reviewer, the 12v dropped to 11.4V, this results in your limit being now 62W.
3. The ATX PCI-E cables must use 12V wires.
4. The PCI-E cables are 6 pin, or 8 pin, the 6pin has a limit of 6.25A, and 8pin limit of 12.5A (thus again, if you have vdrop, your W limit lowers!)
5. Allowed PCI-E cables: 1x6, 1x8, 6+6, 6+8. 8+8 cards exists, but is out of spec, anything beyond that is way out of spec.
Thus the biggest card you can make regarding 12V power (that is what GPU cards tend to draw) is 5.5A for the slot, 18.75A for 8+6 pin ATX cable.
If you have zero voltage drop, this mean the power limit is 291W, IF the GPU has 8pin and 6pin cable. (it is where people are pulling the "300W" limit from)
If you voltage dropped for example to 11.2V (common with cheaper PSUs), the limit is 271W, and if you are a overclocker and overvolt to 12.8V for example, then your power limit is 310W
The RX480 is a single 6-pin GPU, its limits according to the specs are 5.5A (12V) from the slot, and 6.25A from the PSU.
At zero voltage drop (pure 12v), this means it should pull at most 66W from the slot, and 75W from the PSU.
At voltage drop of 11.4v for example, that is what a reviewer saw using a MSI Overclocker motherboard + AX1500i Corsair PSU, the limits are: 62.7W from the slot, and 71.25W from the PSU.
Mind you, what damages the motherboard, pins, connectors, wires, etc... is the amperage, not the raw amount of watts, people that actually used amperage measurement saw the RX 480 with stock settings going 30, 40% over the limit on average (not peak) use. This is outright dangerous, lower quality components might actually caught fire.
You know not everyone play with Steam open right? and that even when Steam is open, it doesn't necessarily count correctly... I personally have a couple games ons team that I played to start to finish in 20hour+ playthroughs that I noticed I got no badges, went to check and I had on Steam like 30 minutes logged.
Firstly I play off of GoG. See screenshot below.
Seondly Roquen is a very common name, it is elvish (Sindarin from Lord of the Rings) for knight.
Thirdly I'll have pictures when I get home in 3 more hours. So please hang tight.