3 motherboards fried trying to get a 7th GPU work

[Bare]

You attached the risers wrong

The data cables or USB cables were in the 1x pcie slots backwards

Been there done that.

You should read my thread here I have great 3 card riser free board builds

How is that possible to plug them in backwards?

I will photo.

see the standard 1x slots  see the small slot with a little wall


https://i.imgur.com/HlJ3Zuw.jpg

only allows for this


but people using the 16x full slot
can do this which is fine


but they can do this. This is a short  which can kill the card the riser the slot the mobo


 

the last pic in your post, it happened to me too but it didn't fry everything, it only fried an external pcie 1x connector(few pins) and sata to molex cable(cheap sata to molex came with the riser) I was using to feed electricity to the riser from the psu, first time in life I saw a cable turn red with heat and then it melted, I guess it pulled too much current... whole thing happened in about 5-10 sec when i realized the smell and cable melting, then I immediately turned the psu off.

everything else was fine psu, psu's cables and connectors, even the pcie 1x slot on the mobo was fine too and working. Note that my mobo was Gigabyte 990fxa-ud5

[Dinmaster]

i currently have a similar situation, mind you im running only 6 cards per machine (tb250-btc) and using a 4kw psu with a pico. i power the board and it burns between the cpu and the backplate (under the heatsink, vrm?), at first i thought it was a ground issue so i wired a ground from the Power Distribution Unit to a screw on a standoff to the motherboard. it powered fine (4 systems) then i got to the 5th and it fried, a pop sound then smoke etc. then i tried to power up the first system i did earlier that was working and it popped and burned. im stumped now... my option now is to take off the picos and power the boards with a 300w or so real psu and just power the cards from the 4kw but not sure if that is a great idea but i would know its solid grounded through the psu instead of make shift.. just to add im not plugging in molex plugs into the two aux connectors, would that make a difference? cause all 6 are on risers just like OP, 006c risers and powered with a pcie.

[MATHReX]

Hey there, don't mind me but I'm wondering how you can check the quality of your risers? Is there a guide to it or something like that. Thanks!

[VoskCoin]

i currently have a similar situation, mind you im running only 6 cards per machine (tb250-btc) and using a 4kw psu with a pico. i power the board and it burns between the cpu and the backplate (under the heatsink, vrm?), at first i thought it was a ground issue so i wired a ground from the Power Distribution Unit to a screw on a standoff to the motherboard. it powered fine (4 systems) then i got to the 5th and it fried, a pop sound then smoke etc. then i tried to power up the first system i did earlier that was working and it popped and burned. im stumped now... my option now is to take off the picos and power the boards with a 300w or so real psu and just power the cards from the 4kw but not sure if that is a great idea but i would know its solid grounded through the psu instead of make shift.. just to add im not plugging in molex plugs into the two aux connectors, would that make a difference? cause all 6 are on risers just like OP, 006c risers and powered with a pcie.

whered you get your psu from?

[rednoW]

You can plug second cpu power cable instead of pci-e power cable. They are similar but not the same ))

[Dinmaster]

Finksy on these forums. My plan now is to just buy 300w seasonic psus to power the boards only and use the 2000w psus for the graphic cards. Should be good I hope

[stevej]

When setting up the GA-H110 Installed the CPU and fan, plugged the GPU into the board for a startoff, got into bios fine and set the Gpu to pcie slot 1, turned on mining mode rebooted and it went into windows fine. I thought everything is ok..
Then turned off and put the gigabyte 1060 Gpu that was in the board onto a VER 009S powered riser.
Everything is on a single EVGA 1000 psu.
Rebooted and the CPU fan spun once then stopped and no post or boot.
Took the GPU out of the riser and plugged it directly into the M/b again.
Tried to boot again but its dead, no CPU fan starting, nothing - dead..

Any ideas on if I can reset the m/b, Have taken the battery out and shorted the cmos pins but still nothing.
The only thing that was different was it went onto a riser then M/B dead after that.
Gone through 3 Motherboards no and have replaced everything new apart from the Risers.
Any ideas ?