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Author Topic: 3x7970 Mining Results.  (Read 57636 times)
DeathAndTaxes
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Gerald Davis


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January 11, 2012, 07:53:16 PM
 #21

Could you make a table with all yours miners/configs? Or would be too much work?

Yeah, when I get a chance.

Just found the voltage limit @ 840mv @ 925mhz... wow.

What is the MH/s and wattage at this voltage/clock?
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Roadhog2k5
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January 11, 2012, 08:34:02 PM
 #22

Could you make a table with all yours miners/configs? Or would be too much work?

Yeah, when I get a chance.

Just found the voltage limit @ 840mv @ 925mhz... wow.

What is the MH/s and wattage at this voltage/clock?

This might blow your mind...

Wattage is measured at the wall plug as total system draw. Subtract the 290 watts of the system idle from the total then divide by 3 to get individual 7970 power draw. Mining results are of 7970 power draw only. My power supply has about 92% efficiency but I did not factor that into the results.


Three 7970's:

System Idle: 290 watts
Mining: 925/1375mhz, 1.17v, 630 watts
Mining: 925/340mhz, 1.17v, 625 watts
Mining: 925/340mhz, 880mv, 360 watts
Mining: 925/340mhz, 865mv, 345 watts

~1650mh/s

Single 7970:
System Idle: 290 watts
Mining: 925/1375mhz, 1.17v, 210 watts
Mining: 925/340mhz, 1.17v, 208 watts
Mining: 925/340mhz, 880mv, 120 watts
Mining: 925/340mhz, 865mv, 115 watts

550mh/s
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January 11, 2012, 08:38:04 PM
 #23

Mother of BitCoin! How do I want to live in a low-tax country....

What was the default specs?

Why dont you get paid by every file downloaded? Yes, you can. uploaded.to
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Roadhog2k5
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January 11, 2012, 08:40:35 PM
 #24

Mother of BitCoin! How do I want to live in a low-tax country....

What was the default specs?

925/1375, 1.17v is the default.

So... Undervolted it hits 5.2mh/watt... Pretty sure no other current cards remotely come close to that. When I get watercooling those results will get even better.
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Gerald Davis


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January 11, 2012, 08:41:08 PM
 #25


This might blow your mind...

Wattage is measured at the wall plug as total system draw. Subtract the 290 watts of the system idle from the total then divide by 3 to get individual 7970 power draw. Mining results are of 7970 power draw only. My power supply has about 92% efficiency but I did not factor that into the results.


Three 7970's:

System Idle: 290 watts
Mining: 925/1375mhz, 1.17v, 630 watts
Mining: 925/340mhz, 1.17v, 625 watts
Mining: 925/340mhz, 880mv, 360 watts
Mining: 925/340mhz, 865mv, 345 watts

~1650mh/s

Well that is impressive.   Almost 5 MH/W.

Can you keep it on 865mV 925Mhz/340Mhz for 24 hours.  If it is stable at that speed, and there are no increased rate of rejects that is very impressive.

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January 11, 2012, 08:43:42 PM
 #26


This might blow your mind...

Wattage is measured at the wall plug as total system draw. Subtract the 290 watts of the system idle from the total then divide by 3 to get individual 7970 power draw. Mining results are of 7970 power draw only. My power supply has about 92% efficiency but I did not factor that into the results.


Three 7970's:

System Idle: 290 watts
Mining: 925/1375mhz, 1.17v, 630 watts
Mining: 925/340mhz, 1.17v, 625 watts
Mining: 925/340mhz, 880mv, 360 watts
Mining: 925/340mhz, 865mv, 345 watts

~1650mh/s

Well that is impressive.   Almost 5 MH/W.

Can you keep it on 865mV 925Mhz/340Mhz for 24 hours.  If it is stable at that speed, and there are no increased rate of rejects that is very impressive.



I have no doubt that it will be stable for 24 hours @ that voltage as it was 3d stable through 1.5 hours of bf3.
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January 11, 2012, 08:55:02 PM
 #27

How did you arrive at the 290 watts system only..  were the cards plugged in at the time? (290 seems like alot)

edit:  what model did you get?

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January 11, 2012, 08:58:02 PM
 #28

How did you arrive at the 290 watts system only..  were the cards plugged in at the time?

edit:  what model did you get?

AMD has this thing called Zero core. It will completely power down the extra video cards in crossfire, and the primary video card after you shut off your monitor. I just turned my monitor off and waited for the gpu's to shut off.

They are XFX ones.

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January 11, 2012, 09:02:41 PM
 #29

thank you...

I have the finger on the buy now button for a couple of diamonds

comon..  somebody talk me out of this...  DeathAndTaxes,  my fellow 5970 miner..  help me out here

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January 11, 2012, 09:06:34 PM
 #30

thank you...

I have the finger on the buy now button for a couple of diamonds

comon..  somebody talk me out of this...  DeathAndTaxes,  my fellow 5970 miner..  help me out here

The undervolt is guaranteed. Every card will be different. :p
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January 11, 2012, 09:10:59 PM
 #31

This might blow your mind...

Wattage is measured at the wall plug as total system draw. Subtract the 290 watts of the system idle from the total then divide by 3 to get individual 7970 power draw. Mining results are of 7970 power draw only. My power supply has about 92% efficiency but I did not factor that into the results.


Three 7970's:

System Idle: 290 watts
Mining: 925/1375mhz, 1.17v, 630 watts
Mining: 925/340mhz, 1.17v, 625 watts
Mining: 925/340mhz, 880mv, 360 watts
Mining: 925/340mhz, 865mv, 345 watts

~1650mh/s

Single 7970:
System Idle: 290 watts
Mining: 925/1375mhz, 1.17v, 210 watts
Mining: 925/340mhz, 1.17v, 208 watts
Mining: 925/340mhz, 880mv, 120 watts
Mining: 925/340mhz, 865mv, 115 watts

550mh/s

Hmm, interesting indeed!  So System Idle power consumption was the same whether you had 3x 7970s in versus 1x 7970?  And it was the same whether you were running 3x 7970s @ 1.17v versus 1x 7970 @ 865mV?

The data is interesting, but I'm still not sure if it beats a 5970 for efficiency as I'm getting 740 MH/s @ 350W for the entire system (I actually got it down to 335W but I forgot what BIOS settings I used, so I'm just going to call it 350W).  The single 7970 numbers you listed show 550 MH/s @ 405W (290W+115W), or am I interpreting the numbers incorrectly?

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Gerald Davis


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January 11, 2012, 09:14:10 PM
 #32

The system idle wattage seems "weird".

What components are used?

Even a 6 core AMD, w/ 8 GB of ram, 2x1TB storage drives, optical, and SSD for boot shouldn't be pulling 290W at idle.  

If the idle wattage is off then it will affect the calculation for the load wattage.

I am assuming though that you OBSERVED 635W at the wall w/ 3 cards @ full load?    That isn't calculated you actually observed 635W at the wall and then calculated the GPU wattage by taking difference from idle.  Right?
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January 11, 2012, 09:15:27 PM
 #33

Hmm, interesting indeed!  So System Idle power consumption was the same whether you had 3x 7970s in versus 1x 7970?  And it was the same whether you were running 3x 7970s @ 1.17v versus 1x 7970 @ 865mV?

The data is interesting, but I'm still not sure if it beats a 5970 for efficiency as I'm getting 740 MH/s @ 350W for the entire system (I actually got it down to 335W but I forgot what BIOS settings I used, so I'm just going to call it 350W).  The single 7970 numbers you listed show 550 MH/s @ 405W (290W+115W), or am I interpreting the numbers incorrectly?

79xx has that new ultra-idle, so that chips in crossfire past the first 1 will basically turn off, and the first chip will idle at almost as low a wattage. AMD has really done well in their green campaign.

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Gerald Davis


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January 11, 2012, 09:16:28 PM
 #34

Hmm, interesting indeed!  So System Idle power consumption was the same whether you had 3x 7970s in versus 1x 7970?  And it was the same whether you were running 3x 7970s @ 1.17v versus 1x 7970 @ 865mV?

The data is interesting, but I'm still not sure if it beats a 5970 for efficiency as I'm getting 740 MH/s @ 350W for the entire system (I actually got it down to 335W but I forgot what BIOS settings I used, so I'm just going to call it 350W).  The single 7970 numbers you listed show 550 MH/s @ 405W (290W+115W), or am I interpreting the numbers incorrectly?

79xx has that new ultra-idle, so that chips in crossfire past the first 1 will basically turn off, and the first chip will idle at almost as low a wattage. AMD has really done well in their green campaign.

What is weird is 290W?  For system at idle w/ ultra efficient low wattage cards (and 2nd+ turned off)?

To put it into perspective:
http://www.techspot.com/review/481-amd-radeon-7970/page11.html

An i7 system w/ 8GB of RAM and 7970 idle wattage is 141.

I am wondering if the system was really at idle. 
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January 11, 2012, 09:17:38 PM
 #35

Hmm, interesting indeed!  So System Idle power consumption was the same whether you had 3x 7970s in versus 1x 7970?  And it was the same whether you were running 3x 7970s @ 1.17v versus 1x 7970 @ 865mV?

The data is interesting, but I'm still not sure if it beats a 5970 for efficiency as I'm getting 740 MH/s @ 350W for the entire system (I actually got it down to 335W but I forgot what BIOS settings I used, so I'm just going to call it 350W).  The single 7970 numbers you listed show 550 MH/s @ 405W (290W+115W), or am I interpreting the numbers incorrectly?

79xx has that new ultra-idle, so that chips in crossfire past the first 1 will basically turn off, and the first chip will idle at almost as low a wattage. AMD has really done well in their green campaign.

What is weird is 290W?  For system at idle w/ ultra efficient low wattage cards (and 2nd+ turned off)?


I dunno, my box idles much lower than that. Hell, without my single 5850 overclocked, thats my system's max power usage.

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January 11, 2012, 09:18:54 PM
 #36

Hmm, interesting indeed!  So System Idle power consumption was the same whether you had 3x 7970s in versus 1x 7970?  And it was the same whether you were running 3x 7970s @ 1.17v versus 1x 7970 @ 865mV?

The data is interesting, but I'm still not sure if it beats a 5970 for efficiency as I'm getting 740 MH/s @ 350W for the entire system (I actually got it down to 335W but I forgot what BIOS settings I used, so I'm just going to call it 350W).  The single 7970 numbers you listed show 550 MH/s @ 405W (290W+115W), or am I interpreting the numbers incorrectly?

79xx has that new ultra-idle, so that chips in crossfire past the first 1 will basically turn off, and the first chip will idle at almost as low a wattage. AMD has really done well in their green campaign.

Ah, that makes sense.  Wow, AMD indeed did put out an awesome product this time around it seems.  That 3-card setup full out putting down over 1.6 GH/s at roughly 650W is pretty damn good.  I'm still not convinced it's better (for mining anyway) than a 5970 setup though.

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January 11, 2012, 09:19:35 PM
 #37

I know if I boot up a rig, the card that has a monitor plugged into it will feel very warm to the touch, even tho it is 'idle'

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January 11, 2012, 09:20:18 PM
 #38

What is weird is 290W?  For system at idle w/ ultra efficient low wattage cards (and 2nd+ turned off)?

To put it into perspective:
http://www.techspot.com/review/481-amd-radeon-7970/page11.html

An i7 system w/ 8GB of RAM and 7970 idle wattage is 141.

I am wondering if the system was really at idle.  

141 is probably closer to the true idle.  1onevvolf had his single 7970 system at 118W at idle:

I've measured my system and these are the results:

                        Stock (925/1375MHz)Overclocked (1125/975MHz)
Mining                        :371 W @ 550MH/s385 W @ 670MH/s
Idle                            :118 W118 W
Difference_(gfx_card_W):253 W267 W
MH/J_(system)             :1.481.74
MH/J_(gfx_card_only)    :2.172.51
MH/$_(gfx_card_only)   :1.001.22

(MH/$ estimated using lowest listed price for HD 7970 on amazon.com today)

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January 11, 2012, 09:21:04 PM
 #39

The system idle wattage seems "weird".

What components are used?

Even a 6 core AMD, w/ 8 GB of ram, 2x1TB storage drives, optical, and SSD for boot shouldn't be pulling 290W at idle.  

If the idle wattage is off then it will affect the calculation for the load wattage.

I am assuming though that you OBSERVED 635W at the wall w/ 3 cards @ full load?    That isn't calculated you actually observed 635W at the wall and then calculated the GPU wattage by taking difference from idle.  Right?

System idle wattage isn't weird. My cpu is @4ghz with all the power saving features disabled. I also have watercooling, the pump alone uses 20 watts...

About the wattage, as I said, the mining figures are without the 290 watts factored in. If you want total system power from the wall just add 290 watts to it.

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January 11, 2012, 09:24:21 PM
 #40

Well, we can get all wet about the power figures but the prices and performance / price ratio still sucks big time AND ( biggest of all ) we still have not seen Nvidia's 28nm arch and products.

I just pray every night they woke up and decided to make a BTC mining card this time around !
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