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Author Topic: 3x7970 Mining Results.  (Read 57688 times)
sveetsnelda
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January 19, 2012, 06:28:09 AM
 #161

If those numbers are correct, these cards are double in term of efficiency.

Not quite, but they're certainly up there.

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January 19, 2012, 07:37:50 AM
 #162

If those numbers are correct, these cards are double in term of efficiency.
Not really, more like ~0% stock and ~ +30% undervolted at stock clock vs. my old 5970 numbers here.
Guess we'll never know why on earth AMD decided to go with 1.175V core at 925 MHz, so far all cards seem perfectly happy at 0.95-1.05V at 925 core for mining and 3D. While at stock V they seem to OC to 1050-1120 MHz... Roll Eyes
Now the big Q: if those aren't cherry-picked chips, what will 7990s be able to reach?

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January 19, 2012, 09:33:19 AM
 #163

I've had my Sapphire-brand 7970 for a few days now, mining away with diablominer. I seem to have come pretty close to what others are seeing - 630MH/s at 1075/685, 1.125V, 76c at 48% fan - but not all the way:

- I can't downclock my memory below 685, the lower limit in Afterburner (the only software that seems to work consistently, trixx won't let me underclock mem or undervolt). I have tried the "set lowest, restart" trick multiple times with no luck.  How are others doing 160 memclock? My card is running bios 113-C3860100-X00, is this the same as everyone else?

- I am monitoring voltages in Afterburner, as neither GPU-Z or GPU Caps Viewer seem to display the correct voltage. Afterburner seems to be displaying a "true" Vcore value, I see it drooping under load and bouncing back to near my setpoint at idle (1.125V set in Afterburner leads to a stable 1.041V under load, 1.115V at idle). I have tried to set my voltage so that the at-load voltage is roughly what other people have been reporting here. When are you guys reporting voltages, which value are you using? I tried running at 925 core, 0.95V like some others have reported here - voltage droops to 0.892v and a TDR follows easily.

Any advice?
I think so far everyone has been using true Vcore under load as AB beta10 displays, so set target 50-70mV higher.

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January 19, 2012, 04:21:39 PM
 #164

As for the memory clock, they're probably dropping it in CGminer or so. Mine is also running at 150MHz, keeps the GPU quite a bit cooler for some reason.
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January 19, 2012, 04:44:53 PM
 #165

If those numbers are correct, these cards are double in term of efficiency.
Not really, more like ~0% stock and ~ +30% undervolted at stock clock vs. my old 5970 numbers here.
Guess we'll never know why on earth AMD decided to go with 1.175V core at 925 MHz, so far all cards seem perfectly happy at 0.95-1.05V at 925 core for mining and 3D. While at stock V they seem to OC to 1050-1120 MHz... Roll Eyes
Now the big Q: if those aren't cherry-picked chips, what will 7990s be able to reach?

A little bird told me AMD is kicking themselves for clocking them too low.

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January 19, 2012, 05:14:56 PM
 #166

If those numbers are correct, these cards are double in term of efficiency.
Not really, more like ~0% stock and ~ +30% undervolted at stock clock vs. my old 5970 numbers here.
Guess we'll never know why on earth AMD decided to go with 1.175V core at 925 MHz, so far all cards seem perfectly happy at 0.95-1.05V at 925 core for mining and 3D. While at stock V they seem to OC to 1050-1120 MHz... Roll Eyes
Now the big Q: if those aren't cherry-picked chips, what will 7990s be able to reach?

A little bird told me AMD is kicking themselves for clocking them too low.

Nah, you forget these are the reference cards.  They need to leave headroom for the card makers to put out their factory overclocked and otherwise special edition cards. 
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January 19, 2012, 05:31:45 PM
 #167

Nah, you forget these are the reference cards.  They need to leave headroom for the card makers to put out their factory overclocked and otherwise special edition cards. 

Yup and AMD collects a royalty on those "factory overclocked" models. win-win. Smiley
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January 21, 2012, 06:44:01 AM
 #168

still not as good as dual 6990
sveetsnelda
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January 21, 2012, 08:23:22 AM
 #169

still not as good as dual 6990

700-850 less Mhash/sec for the same power and the cards don't even exist anymore...   Yes.  Two 6990's are obviously superior.   Roll Eyes

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January 21, 2012, 05:57:59 PM
 #170

So, new GPU-Z allows me to calculate the exact power draw of a 7970. It reads the VDDC Current in, which I assume is the power the gpu is drawing from the +12v rail. So if you take the reading of 10.5 Amps and multiply it by 12 volts, you get 126 watts.

This verifies that my original figures are within 5% of the actual.

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January 21, 2012, 06:06:38 PM
 #171


I would not count much on the accuracy of the voltage and current sensors, it would be better to calculate a rig with onbard graphics and then this same rig with a 7970 @ 100% load. That's assuming the CPU had same load in both cases.
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January 21, 2012, 06:08:05 PM
 #172


I would not count much on the accuracy of the voltage and current sensors, it would be better to calculate a rig with onbard graphics and then this same rig with a 7970 @ 100% load. That's assuming the CPU had same load in both cases.

Did you even read what I said? It's within 5% of my calculated figures, so it is more than likely more accurate than what I calculated.
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January 21, 2012, 06:14:10 PM
 #173

Did you even read what I said? It's within 5% of my calculated figures, so it is more than likely more accurate than what I calculated.

Sorry haven't seen that, either you edited the post or I;m just tired (the latter being more probable)
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January 21, 2012, 06:16:40 PM
 #174


I would not count much on the accuracy of the voltage and current sensors, it would be better to calculate a rig with onbard graphics and then this same rig with a 7970 @ 100% load. That's assuming the CPU had same load in both cases.

Did you even read what I said? It's within 5% of my calculated figures, so it is more than likely more accurate than what I calculated.

Or they are inferring it from other sources instead of measuring it directly.

Totals watts from wall / total hashes from rig = gold standard.

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January 21, 2012, 06:23:35 PM
 #175


I would not count much on the accuracy of the voltage and current sensors, it would be better to calculate a rig with onbard graphics and then this same rig with a 7970 @ 100% load. That's assuming the CPU had same load in both cases.

Did you even read what I said? It's within 5% of my calculated figures, so it is more than likely more accurate than what I calculated.

Or they are inferring it from other sources instead of measuring it directly.

Totals watts from wall / total hashes from rig = gold standard.

Sure, but I measured all possible sources now. :p
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January 21, 2012, 06:33:39 PM
 #176


I would not count much on the accuracy of the voltage and current sensors, it would be better to calculate a rig with onbard graphics and then this same rig with a 7970 @ 100% load. That's assuming the CPU had same load in both cases.

Did you even read what I said? It's within 5% of my calculated figures, so it is more than likely more accurate than what I calculated.

Or they are inferring it from other sources instead of measuring it directly.

Totals watts from wall / total hashes from rig = gold standard.

Sure, but I measured all possible sources now. :p

You should buy beg borrow or steal a 5970 and do a head to head with the same rig.  100% vs 100% mining flat out under various voltages & core speeds, with MH/s and watts in a pretty spreadsheet.

Mmmmm...spreadsheets.  Grin

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Roadhog2k5
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January 21, 2012, 06:36:38 PM
 #177


I would not count much on the accuracy of the voltage and current sensors, it would be better to calculate a rig with onbard graphics and then this same rig with a 7970 @ 100% load. That's assuming the CPU had same load in both cases.

Did you even read what I said? It's within 5% of my calculated figures, so it is more than likely more accurate than what I calculated.

Or they are inferring it from other sources instead of measuring it directly.

Totals watts from wall / total hashes from rig = gold standard.

Sure, but I measured all possible sources now. :p

You should buy beg borrow or steal a 5970 and do a head to head with the same rig.  100% vs 100% mining flat out under various voltages & core speeds, with MH/s and watts in a pretty spreadsheet.

Mmmmm...spreadsheets.  Grin

No, that takes work. /lazy
k9quaint
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January 21, 2012, 06:48:38 PM
 #178

At least label your wattage numbers so we know if they are total or not Tongue
And if they are not total, write the total watts in there too.

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sveetsnelda
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January 21, 2012, 07:45:19 PM
 #179

You should buy beg borrow or steal a 5970 and do a head to head with the same rig.  100% vs 100% mining flat out under various voltages & core speeds, with MH/s and watts in a pretty spreadsheet.

Mmmmm...spreadsheets.  Grin

You should pay me for lost BTC during the downtime.  Then I'll do it.  Tongue

Mmmmm...chocolate covered spreadsheets.  Grin

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January 22, 2012, 01:22:11 PM
 #180

 Grin holy smokes

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