Powering Gigabyte GTX 1070 G1 Gaming in HP Z600 through additional power cables

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Krkseg1ops

Commendable
Feb 13, 2017
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1,510
Hello everyone,

I've recently been struggling with my new GTX 1070 after upgrading it from GTX 1060. What bothers me is the my machine keeps shutting down when working under full load for a while. GTX 1070 by Gigabyte has a single 8-pin connector and my PSU(650W, 85% eff) has one 6-pin connector, one 4-pin molex, and one SATA cable. I used a simple 6-pin to 8-pin adapter and the card works flawlessly until I start utilizing the GPU heavily. Now, I've reduced the power consumption by 10%(to 90%) and it doesn't shut my PC but once I extend it to 111% power consumption, OC the core by +150MHz, it will crash as soon as the power consumption raises above the TDP(as GPU-Z shows).
It never happened with my former GTX 1060 by MSI and I don't want to fry my rig. There is no option to replace the PSU as it is a proprietary one from HP. I have the following questions:
1. Is it safe to power up my card using two different power rails from my PSU(one being the 6-pin GPU connector and the other one being either 4-pin molex or the SATA cable)?
2. How would you go about powering the card with such options? All outputs(SATA,Molex,6-Pin) provide the same amperage in their +12V wires(18A), how many +12Vs I need to power up GTX 1070?
3. Any other ideas how to alleviate my torment?

Many thanks in advance for those who reply.

Kind regards,
Peter
 
Solution
notea
seems like the PSU cant deliver the required amount of power, id suggest getting a new PSU and dont mess with the wiring, you could end up with a fancy paperweight
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K

Krkseg1ops

Commendable
Feb 13, 2017
11
0
1,510
Notea, thanks for your reply. Based on my research, there are a lot of refurbished HP Z600s with GTX 1080s installed in them. I see no problem with GTX 1070. The only question would be whether I provide 100W from the 6-pin and 40/50W from Molex/SATA into one 8-pin or if there is a better(simpler) solution. I appreciate your feedback, though.
 
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notea

notea

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Dec 23, 2011
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what i meant was that the PSU seems to be faulty, a normal/generic 650W should be able to power a single GTX 1070 (170Watts), and you saying that the PC crashes when you put load on the GPU - it means that the PSU cant give enough power to the 1070 and in fact not working as it should, and if your PC is a refurb, all the more reason to change the PSU, id suggest getting a 500W unit from Corsair/Seasonic/EVGA/FSP or any other reputed brand, but dont go for the value series/cheap models, just buy the best that you can afford.
 
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K

Krkseg1ops

Commendable
Feb 13, 2017
11
0
1,510
Ok, thanks for clarification. Do you think a single 6-pin coming out of my PSU is enough for GTX1070 then? I am currently using a 6-pin to 8-pin adapter from a generic manufacturer - can this be an issue? Should I search for other adapters? Or should I replace the PSU altogether? Truth be told, I got it off a British company in London which used it as a workstation so I'm assuming it had ran for several years without a stop.
One last thing - In your opinion, do I give the molex+6-pinPSU-->8-pin GPU connector a try or it might burn the neighbourhood?

Regards,
 
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notea

notea

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Dec 23, 2011
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dont use cable adapters unless you have no other choice, as i said, get a new psu, and if the old psu has been running on load for years, its efficiency will have degraded by quite a bit, maybe thats the reason your pc crashes on gpu load, and yea, ive used a 6 pin to 8pin adapter myself, well a sleeved extension but soon changed it to 8pin to 8pin extention.. use the adapter as a last resort only
 
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