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75w from 20w pcie?

Mynight

Mynight

Mynight

Soldato
Joined
16 Jun 2013
Posts
5,375
I've been a bit of a moron.

Plugged a 7970 into a hp office pc.

Loud pop followed by the "you've screwed up" smoke.

Orginally I had planned on just leaving it to mine so bought a nice 750w psu to power the gpu itself while the motherboard would have been powered by the built in psu(propriety connections on mobo because hp...).

Both worked beforehand but now neither show signs of life.

I had just expected it to not power up as I hadn't turned on the second psu yet. Certainly didn't expect to burn something.

Visually nothing looks burnt or blown.

Anyone know if there's any hope of a resurrection of the gpu or should I just write it off?
 
Unlikely to be GPU damage, would be the hp PSU gone pop I would think.

Still not sure why, because in the few HP's I have come across that are labelled as such, I was led to believe it was a bios controlled current limit, rather than anything physical
 
I presumed the same thing. On the few occasions something has gone wrong in my previous PCs the psu kicked in and took the brunt leaving the components unaffected.

Shot in the dark but if I plugged in the 6 and 8 pins to the gpu and jumped the psu should I expect the gpu fans to still spin whilst it's not plugged into a pcie port? (They don't)

I'm sure you can understand my hesitation at plugging the 7970 into my main pc to test if it's working still :D.
 
Quartz said:
Have you checked the underside of the HP motherboard?
Click to expand...

I haven't. On it now.

The pc itself is easily disposable but can't hurt to check. I do have a second one but seems like a waste if I can't work out what happened here and it repeats.

Edit: Nope underside is intact as well. Sadly psu is press sealed so I'm not having a look without destroying it.
 
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Mynight said:
I haven't. On it now.

The pc itself is easily disposable but can't hurt to check. I do have a second one but seems like a waste if I can't work out what happened here and it repeats.

Edit: Nope underside is intact as well. Sadly psu is press sealed so I'm not having a look without destroying it.
Click to expand...
Have you tried to actually jump start the hp psu to see if it's actually still alive?
 
Thekwango said:
Have you tried to actually jump start the hp psu to see if it's actually still alive?
Click to expand...

Haven't tried that. The cable layout confused me so gave up on the idea. Will have a Google see if I can work out which ones to bridge.

Have been looking and found this;

https://www.overclockers.co.uk/koli...rd-mining-rendering-kit-pro-1m-cb-006-kk.html

Maybe I'm being thick here but that should allow me to bypass the 20w limit on the mobo pcie correct? Assuming the card isn't dead £11 seems a good price to find out.
 
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Just goes to show what absolute crap corp PC's are. It should just have tripped and not powered up and instead it incinerated itself while taking out peripheral components.
 
Diagro said:
Why not just use the 750w PSU to power mobo and gpu???
Click to expand...

That was the original plan but they don't have an atx plug they have a normal 6 pin, a 6pin I've forgotten the name of (p2 in pic) and a 4pin.

IMG_3918.jpg


Sadly psu is dead no signs of life after jumping it.

Tempted to buy one of those powered risers to check if the card itself is dead as well. Should bypass the pcie wattage limit and remove any strain from the hp psu.

Although since the GPUs fans don't spin when connected to the 6 and 8 pins I suspect it's borked as well :(.

Edit: Just bought one of the pcie risers from ocuk. Guess tomorrow I will find out if it's truely dead or not :eek:.
 
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Mynight said:
Although since the GPUs fans don't spin when connected to the 6 and 8 pins I suspect it's borked as well :(.
Click to expand...

Not necessarily - remember most cards still need to draw the required 75w from the pci-e slot, even with additional connectors.
 
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