Topic: Three 7950's dedicated power supply wattage? (Read 1917 times)
850 W should be enough.
You can run 3x 7950 off a good quality 850w if you undervolt them. If not go with a 1000w.
A different product I use is the Lian Dual PSU adapter cable. It's cheaper than that doohicky and works well for me. Best price I found for them was a frozencpu.com
http://www.frozencpu.com/products/5637/cpa-167/Lian_Li_Dual_Power_Supply_Adapter_Cable.html
Hey I was having same issue with my 5970 ( work for some time and then stop) sets flags to -v -w128 -f1 ..... But anyone know if u can set flags in bitminter?
A bit off topic, but when you use a second PSU, does it mess with the cards running off the second PSU to have power when the mobo power is off?
You can safely splice the PSUs together so they turn on and off together, or just make a switch:http://www.overclock.net/faqs/15751-info-can-i-use-two-power.html
Aye I read that guide about jumping the PSU, but it doesn't go into slaving the 2nd PSU to the first. Would you only have to splice the ps_on onto the primary PSU? Or would you still do both?
Think the 1000 watt version of this would work not being plugged into a motherboard? Doing the paperclip trick.
http://www.rosewill.com/products/1370/ProductDetail_Overview.htm
http://www.rosewill.com/products/1370/ProductDetail_Overview.htm
A bit off topic, but when you use a second PSU, does it mess with the cards running off the second PSU to have power when the mobo power is off?
You can safely splice the PSUs together so they turn on and off together, or just make a switch:http://www.overclock.net/faqs/15751-info-can-i-use-two-power.html
A bit off topic, but when you use a second PSU, does it mess with the cards running off the second PSU to have power when the mobo power is off?
That's like the paperclip trick I was talking about. But someone pointed out minimum requirements on different rails.
Yupp...
I have been thinking that it might be better to have a seperate 12V power-supply, and that it might be better and cheaper than a PSU as a secondary electrical source. But seems like most of the stuff I can find are inverters(going the other way.)
That's like the paperclip trick I was talking about. But someone pointed out minimum requirements on different rails.
If anyone can suggest a 1000 watt power supply that doesn't have a minimum, I would appreciate it 
I be looking for one in the mean time.
I be looking for one in the mean time.
Be careful here. Other than the obvious, checking you're shorting the correct pins you need to look at the minimum load specifications for the power supply. A lot of PSUs specify a minimum load on the other supplies e.g. 5V. You need to check this out before going any further. You may find you need to add a few power resistors to generate the minimum loads to ensure proper regulation.
If I plug the 24 pin into an old motherboard that won't be used, but turn on the power supply by turning on the motherboard should that work?
http://www.playtool.com/pages/psuunderload/mincurrent.html
Be careful here. Other than the obvious, checking you're shorting the correct pins you need to look at the minimum load specifications for the power supply. A lot of PSUs specify a minimum load on the other supplies e.g. 5V. You need to check this out before going any further. You may find you need to add a few power resistors to generate the minimum loads to ensure proper regulation.
If I plug the 24 pin into an old motherboard that won't be used, but turn on the power supply by turning on the motherboard should that work?
I read there is a paperclip trick to get a power supply to turn on without a motherboard.
Be careful here. Other than the obvious, checking you're shorting the correct pins you need to look at the minimum load specifications for the power supply. A lot of PSUs specify a minimum load on the other supplies e.g. 5V. You need to check this out before going any further. You may find you need to add a few power resistors to generate the minimum loads to ensure proper regulation.
Im running 4x 7950 with a 1050W gold psu.
think of undervolting your card a bit, saves a lot (heat and cost).
think of undervolting your card a bit, saves a lot (heat and cost).
Thanks for the replies.
You can run 3x 7950 off a good quality 850w if you undervolt them. If not go with a 1000w.
I don't know if it matters but they are the XFX double D 7950's.
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