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Hash rate vs Power consumed

post #1 of 40
Thread Starter 
I have tested the cards in my small GPU mining farm and have been a little surprised by power consumption. I think I'm going to move towards cards that are over 2, preferably 2.2 MH/W. I think the only way to do this is going to be with newer 7XXX GPUs. Has anyone measured power consumption for 7750/7770/7790 GPUs yet while mining SHA256 (bitcoin)?
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post #2 of 40
The whole power of which a part is non green for a virtual product still bafles me.
You'll get best hashrate/J with the 7790 as it is based of a improved version of GCN 1.0
post #3 of 40
Thread Starter 
I know the 7790 will produce the best hash rate of the three, but I'm curious if anyone has tested the power consumption with a killawatt for example. I know the main wiki has estimates but when I tested my own cards, I found very different results.
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post #4 of 40
Quote:
Originally Posted by Mr.N00bLaR View Post

I know the 7790 will produce the best hash rate of the three
I not only meant that I also meant the most efficient one.
I'm not really up to speed on this Bitcoin stuff so I'll leave it to the pro's
post #5 of 40
Since I have my kill-a-watt in the wall I'll pull some quick numbers for you:

My sig-rig running with essentially no CPU load and:

One mining 7970 at 1050/1500 -- 550w from the wall
Two mining 7970's at 1050/1500 -- 800w from the wall.

Both 7970's get me about 600mhash each. You can easily bump the Mhash up with an OC on the core. Memory does very little for Mhash so you can actually underclock your memory to save a bit of power.

I, fortunately, don't have to pay for power so I'm not losing a penny on these babies biggrin.gif

Edit: My system in regular web browsing with no mining pulls 280w.
Edited by alcal - 6/6/13 at 4:25pm
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post #6 of 40
Quote:
Originally Posted by Mr.N00bLaR View Post

I have tested the cards in my small GPU mining farm and have been a little surprised by power consumption. I think I'm going to move towards cards that are over 2, preferably 2.2 MH/W. I think the only way to do this is going to be with newer 7XXX GPUs. Has anyone measured power consumption for 7750/7770/7790 GPUs yet while mining SHA256 (bitcoin)?

Over on AnAndtech somebody did it with the 7790 and he was hardly pulling anything .. Started a 7790 Mad rush to get them lol.

And i stand Strongly Behind the 7790 With power factored in being by far the over all champion in profits " Gpu wise "

But from a gaming stand point the 7790 is not that great of card... Great for a dedicated mining rig tho...
    
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post #7 of 40
You have to take into account the fact that for HD7790s to be better than HD7970/HD7950 you have to be running like 5-6 on a mobo. The added power cost of having to get another CPU+Mobo is incurred when you have a lower mhash/s.

https://en.bitcoin.it/wiki/Mining_hardware_comparison

HD7750 ~130Mhash/s
HD7770 ~200Mhash/s
HD7790 ~300Mhash/s
HD7950 ~500-600 Mhash/s

extremetech has a lower number of 270Mhash/s http://www.extremetech.com/computing/153467-amd-destroys-nvidia-bitcoin-mining/2
Edited by AlphaC - 6/6/13 at 5:47pm
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post #8 of 40
Quote:
Originally Posted by AlphaC View Post

You have to take into account the fact that for HD7790s to be better than HD7970/HD7950 you have to be running like 5-6 on a mobo. The added power cost of having to get another CPU+Mobo is incurred when you have a lower mhash/s.

https://en.bitcoin.it/wiki/Mining_hardware_comparison

HD7750 ~130Mhash/s
HD7770 ~200Mhash/s
HD7790 ~300Mhash/s
HD7950 ~500-600 Mhash/s

extremetech has a lower number of 270Mhash/s http://www.extremetech.com/computing/153467-amd-destroys-nvidia-bitcoin-mining/2

You get Pci-e risers

Most people using 7790s are using them for dedicated mining... So they will not be using an expensive cpu / mb.

They will get some Old Core 2 quad set up use Pci-e risers and go at it...

I use i5 750 1156 systems myself.
    
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post #9 of 40
I know about the PCI +PCI-e risers that's why I wrote 5-6 cards on a mobo. You can put the HD7950s on PCI-e risers as well making it a moot point wink.gif

Even if you buy a cheap CPU + Mobo you need an efficient PSU , RAM, network cable/WIFI, USB Drive, etc.
Edited by AlphaC - 6/6/13 at 6:04pm
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post #10 of 40
Yah put it comes down to Hash per power ratio... Id say when it comes down to this the 7790 would wipe the floor with a 7950.
    
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