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mate blown 2 gpus, 2 psus on 1 card , fixable?

Soldato
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so the story goes like this, he set up his cards on PCI E risers, and then the clown powered the risers from the same psu that powered the MB / hdd . the he had another psu that powerd the 6/8 pin on the cards, he rebooted the machine . which stopped power going to the card via the riser but the other PSU was jumped so was still pushing power down the 6/8 pin connection, what would be the likely hood of gettings these 2 gpus fixed? i was thinking it could just be an internal fuse / mosfet
 
Associate
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2 Feb 2021
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206
Sounds like a mining rig :) 2 psu is always a bad idea as the power phases will be different, that’s why you can never directly merge 2 different psu connections without something blow up a long the way.

Exact damage will dependent on how the riser is designed. You can use a multimeter to measure the fuse on the riser and card via continuity, worst cast you would have blown diodes which will be impossible to track down.
 
Soldato
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Woburn Sand Dunes
rebooting doesnt shut the 12v rails off, So i dont see how that would have damaged the cards. Sounds like there's more to it but if anything i think the problem is likely the risers rather than anything else but who knows without looking at the gear in question.
 
Associate
Joined
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2,236
so the story goes like this, he set up his cards on PCI E risers, and then the clown powered the risers from the same psu that powered the MB / hdd . the he had another psu that powerd the 6/8 pin on the cards, he rebooted the machine . which stopped power going to the card via the riser but the other PSU was jumped so was still pushing power down the 6/8 pin connection, what would be the likely hood of gettings these 2 gpus fixed? i was thinking it could just be an internal fuse / mosfet

Anti miner feelings are a little OTT, most small miners are computer / gaming enthusiasts who grabbed an extra card or so to make a little cash or because they think they can pay off the card cost.
May not even have current generation just trying to make a few extra £.
Plenty of forum members buying lots of cards to get 'something' then flip between something else they compete for. 3070 - 6800 - 3080 - 3090 etc.

OP: Your "Mate" shouldn't connect those Cards, PSU's, Motherboards to anything else until they have been tested or they could damage more equipment.
If anything smells of magic smoke, it's likely dead or needs specialist repair.

The motherboard should be OK as most risers only share data lines, most likely damaged are the PSU's or the GPU's.

Test the PSU's first, jump it and use a multimeter to check the power is within spec on each rail.

Take the GPU's, one at a time. Connect to a known good (preferably new) riser so the GPU power is isolated from the motherboards in case of fault.
The riser and the GPU should be on the same single and known good power supply.
Test the card, if it's dead then it would need specialist repair but it may be fine.
 
Soldato
OP
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St helens
lol @ all the hate, he had 4 cards and he over paid far more than he should of for every one of them, from people like you know, you lot selling them at higher prices because of miners ;), they arnt new cards either, gtx1080 and rx580 is blown.

the cards have been tried direct in his motherboard and dont even show up in device manager, the gtx1080 game rock card will light up / fans spin, but the asus rx 580 doesnt even get a flicker of fan speed

and for anybody thinking my mate is me.. its not. i have 2 RX cards my self sat in my pc working just fine.
 
Associate
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8 Mar 2011
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626
Pci-e provides 3.3v power and 12v power. 6pin adn 8pins provides extra 12v power.

I think turning off 3.3v and 12v powers u turned off half of the pcb, and that could have messed up entire power up sequence. resulting in uncnown power splits.

Your mate should have powered pci-e riser and gpu ppower rails from same psu. so if u turn psu u turn off gpu.
dead gpu can be repaired it depends on whats blown.

i had some mixed results in gpu repairs before entire market gone to ****.
 
Soldato
Joined
18 Oct 2002
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Elsewhere
lol @ all the hate, he had 4 cards and he over paid far more than he should of for every one of them, from people like you know, you lot selling them at higher prices because of miners ;), they arnt new cards either, gtx1080 and rx580 is blown.

the cards have been tried direct in his motherboard and dont even show up in device manager, the gtx1080 game rock card will light up / fans spin, but the asus rx 580 doesnt even get a flicker of fan speed

and for anybody thinking my mate is me.. its not. i have 2 RX cards my self sat in my pc working just fine.
Doesn’t the RX580 have zero fan mode anyway at boot? My old RX570 did.
 
Soldato
OP
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St helens
the reason he powered it up wrong was simply rushing like a **** trying to get it set up. i dont know if it has 0 RPM mode, but either way both cards arnt been shown in device manger when used in any pci slot. he has 2 rx590s which are working and both show up fine using either a riser or the boards standard pci e slot. the asus so called has a warranty as it bought new last year, i told him these cards havnt been sold in ages so the blokes more than likely lieing to him
 
Associate
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5 Mar 2017
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Expensive lesson to learn, I'm afraid.
Issue is, as with anything else, a complex (or at least non-conventional) setup would require experience or many, many hours researching to make sure nothing nasty happens.
Despite the abundant info available everywhere, mix two PSUs on the same setup and multiple GPUs, it's likely a recipe to disaster.
Same feeling when someone who never put together a PC before and may try at their first go de-lid, watercool every component and overclock. Experience is a learning curve.
If a new PSU/different Motherboard is used, just to eliminate few variables, if the GPU isn't recognized, I'm afraid that is a paperweight now.
Even if the damage was only to part of the GPU, and not frying the chip, repair costs would likely cost more than the GOU itself, and there's a big chance that even repairing what seems to be damaged, may not bring the card back to 100%. Same thing that happens with car's engines. Fix one problem, an underlining problem comes up.
 
Caporegime
Joined
18 Oct 2002
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37,396
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Ireland
/puts on hick voice.

BOY! We don't take kindly to Miners in these here parts.

*spits in spittoon and swaggers away.
 
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