power supply watts for 3-7950

[brudog]

   I have been reading all I can find on wattage ratings for gpu's, there is a wide variety of opinions. Ratings for 3  7950's range from 535 to over 1000 watts. AMD says 7950 is

limited at 200 watts which I would say is probably about right. what I'm getting at 2 different power supply calculators rated 3  7950 system at 1015 watts. seems kind of high

to me. I have 2  7950's on a 750 watt psu no problem. Does anyone have 3  7950's on a 1000 watt psu? I have a Rosewill RBR1000 Bronze. I hate frying psu's. Ran 3 5830's on

a 750 watt HEC for 6 months, changed it to 2  6870's and a 5830...Lasted almost 5 minutes. 1000 watt psu's are to expensive to waste.

[brudog]

 Sorry for posting this, I just read on this forum someone with 3  7950's shows 1080 with a kil-a-watt meter, maybe I'll through my 7870 in with them and run 2 smaller psu's.

[KWH]

 Sorry for posting this, I just read on this forum someone with 3  7950's shows 1080 with a kil-a-watt meter, maybe I'll through my 7870 in with them and run 2 smaller psu's.

I always like a "safety buffer" for several reasons. I have used 2 PSU's many times in the recent past but 1 large PSU is better for me.

[BlazinBeaches]

200 watts per card plus 200 for mobo cpu, etc = 800 watts + 15% breathing room = 920watts.  I'd get a 950watt Platinum, Silver, or Gold for that rig.  

150 watts higher if you plan to do excessive overvolting.

Higher if you want more cards in the future.  

[BlazinBeaches]

 Sorry for posting this, I just read on this forum someone with 3  7950's shows 1080 with a kil-a-watt meter.

He could have been doing extreme overclocking or using a very inefficient cheap PSU or both.  It also depends on his CPU and socket type. lga1366 & lga2011 are power hungry

As an example; I have 4 of my 7970s,mobo,ivy bridge cpu,etc hooked up to a silverstone 1200watts and it sucks 1000+/- from the wall.

I do undervolt 10-12% though

[hendo420]

I run 3x 7950s per rig and this is the only power supply I use.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207021&IsVirtualParent=1

I'm fairly certain I could do 4 cards per board, but I left that open for upgrade later.

One system has a low power APU and the other has a low power AMD x4 either pulls like 65w.

[dropt]

I've got 3x 7950's on a XFX Pro 1000W Plat.  No problems.   Not sure about usage, I should check that.

[ryantc]

I am running 3 7950 on a antec hcp 1000
there was a 7850 in the system before I pull it out.
I don't oc the card too much, only about 40 above stock core and keep stock memory clock @ 1.013v hashing @ 550-560 each

so basically I thing I am not pushing the PSU at all, and I am thing to swap in a hx850 instead....but not sure if that's safe

[JohnyBigs]

I run 800w with undervolt and slight overclock, full power and overclock you will hit 1200w, i have a gold 1300w psu

[r2vape]

I am running 3x Gigabyte 7950 on a ThermalTake 850 Gold.

No powered risers.

[bitbyebit]

 Sorry for posting this, I just read on this forum someone with 3  7950's shows 1080 with a kil-a-watt meter, maybe I'll through my 7870 in with them and run 2 smaller psu's.

Rosewill LIGHTNING-1300 1300W
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182063

Running 4 7950's with monitor and box fax to around 810KW.

[xgtele]

I am running 3x Gigabyte 7950 on a ThermalTake 850 Gold.

No powered risers.

Same

[lubosspe]

I have 5 7950 on 1200 W PSU (Enermax MaxRevo 1200W)

[azwccc]

I am running 3x Gigabyte 7950 on a ThermalTake 850 Gold.

No powered risers.

I am building a 3x 7950 rig without risers, do you mind to provide some info about your motherboard?

[r2vape]

Sure, don't laugh, but this has worked wonders and I have purchased another cpu/mb to get another rig made.

Gigabyte GA-H61MA-D3V with Celeron G1610 processor.  Used the unpowered PCIe x16 to x1 at the $3AU pricing with free shipping from ebay (bought 18 as I have plans that I hope my wife ignores  ).

[Damnsammit]

Sure, don't laugh, but this has worked wonders and I have purchased another cpu/mb to get another rig made.

Gigabyte GA-H61MA-D3V with Celeron G1610 processor.  Used the unpowered PCIe x16 to x1 at the $3AU pricing with free shipping from ebay (bought 18 as I have plans that I hope my wife ignores  ).

hahah!  Good luck!  My wife has officially shut down my mining rig expansion

.... for now!

[xgtele]

Life lesson: If you plan to GPU mining at home, think twice. You will get a lot of heat and an angry wife 

Sure, don't laugh, but this has worked wonders and I have purchased another cpu/mb to get another rig made.

Gigabyte GA-H61MA-D3V with Celeron G1610 processor.  Used the unpowered PCIe x16 to x1 at the $3AU pricing with free shipping from ebay (bought 18 as I have plans that I hope my wife ignores  ).

hahah!  Good luck!  My wife has officially shut down my mining rig expansion

.... for now!

[KWH]

990FX MB, FX6100 AMD(stock clocks), 16GB RAM, SATA HD, 4-7950 (Stock clocks, slightly undervolted), 4 - 120mm fans. 4 CPU cores loaded on Boinc, pulling 1140 watts at the wall. 1089 watts with CPUs idle. OCZ 1250 Gold PSU.

[Lucky - Luciano]

990FX MB, FX6100 AMD(stock clocks), 16GB RAM, SATA HD, 4-7950 (Stock clocks, slightly undervolted), 4 - 120mm fans. 4 CPU cores loaded on Boinc, pulling 1140 watts at the wall. 1089 watts with CPUs idle. OCZ 1250 Gold PSU.

      How do you measure consumption (which instrument - the software)?

[KWH]

Kill-A-Watt meter.