7970 vs 5970 power consumption

[crazyates]

Does it make sense to be mining with 7970, would you loose money or make money ?

i've heard the 7970 is the most efficient mining card..

An undervolted 7970 can reach amazing numbers on very little power.

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[vdragon]

Does it make sense to be mining with 7970, would you loose money or make money ?

i've heard the 7970 is the most efficient mining card..

 I got a bunch of 5970s, 6990s, 7950s and 7970s. Basicly in my experience, 7950 is the most efficient card. And it doesnt pump out as much heat as the rest of the bunch. Too bad there isnt a thread where we could all show results.

[zvs]

cgminer @ 1.05V/820/300, 377W, 761Mh/s

well, that's not  best really anyway, since you can pull 757Mh/s at 820/140

[ssateneth]

I got actual power figures for 5970. I ran a computer equipped with a 450 watt 80PLUS Gold power supply with a single 5870 in it and mined to get a baseline figure. It came to 175 watts with a kill-a-watt. I added a 5970 on top of that and ran both cores at 1v, 760MHz and 152MHz memory and mined on the 5870 plus 5970. Power increased to 425 watts with a kill-a-watt and the 5970 generated 705 MHash/sec.

Radeon 5970 @ 760/152/1v = 705Mhash/sec @ 250 watts = 2.82MHash/joule.

[vdragon]

I got actual power figures for 5970. I ran a computer equipped with a 450 watt 80PLUS Gold power supply with a single 5870 in it and mined to get a baseline figure. It came to 175 watts with a kill-a-watt. I added a 5970 on top of that and ran both cores at 1v, 760MHz and 152MHz memory and mined on the 5870 plus 5970. Power increased to 425 watts with a kill-a-watt and the 5970 generated 705 MHash/sec.

Radeon 5970 @ 760/152/1v = 705Mhash/sec @ 250 watts = 2.82MHash/joule.

 This was brave putting those 2 on a 450w supply

[DrG]

I got actual power figures for 5970. I ran a computer equipped with a 450 watt 80PLUS Gold power supply with a single 5870 in it and mined to get a baseline figure. It came to 175 watts with a kill-a-watt. I added a 5970 on top of that and ran both cores at 1v, 760MHz and 152MHz memory and mined on the 5870 plus 5970. Power increased to 425 watts with a kill-a-watt and the 5970 generated 705 MHash/sec.

Radeon 5970 @ 760/152/1v = 705Mhash/sec @ 250 watts = 2.82MHash/joule.

 This was brave putting those 2 on a 450w supply

It's not brave, it's smart.  He used a Gold PSU, so he probably had close to 450W available on the 12V rails (probably single rail).  If it was a simple Celeron or Sempron 400W could go to the 2 GPUs and if he downclocked the RAM he probably had enough room to throw a 7770 in there too

A cheap 450 PSU will have 240W available on the 12v (maybe 20A), a high end Gold PSU is made for this stuff - no need for overkill.  Quality over quantity.

[ssateneth]

I got actual power figures for 5970. I ran a computer equipped with a 450 watt 80PLUS Gold power supply with a single 5870 in it and mined to get a baseline figure. It came to 175 watts with a kill-a-watt. I added a 5970 on top of that and ran both cores at 1v, 760MHz and 152MHz memory and mined on the 5870 plus 5970. Power increased to 425 watts with a kill-a-watt and the 5970 generated 705 MHash/sec.

Radeon 5970 @ 760/152/1v = 705Mhash/sec @ 250 watts = 2.82MHash/joule.

 This was brave putting those 2 on a 450w supply

It's not brave, it's smart.  He used a Gold PSU, so he probably had close to 450W available on the 12V rails (probably single rail).  If it was a simple Celeron or Sempron 400W could go to the 2 GPUs and if he downclocked the RAM he probably had enough room to throw a 7770 in there too

A cheap 450 PSU will have 240W available on the 12v (maybe 20A), a high end Gold PSU is made for this stuff - no need for overkill.  Quality over quantity.

You are correct. I stopped using cheapo power supplies. 80plus gold or better for me from now on. Entire capacity can be drawn on 12v. Rosewill Capstone 450W. Didn't even get warm. On the other end, I have an Antec TruPower II 550 watt. It's something like 70% efficient, no active PFC, and available 12v power is poor. It shut off when I was furmark testing a Radeon 6970. No other video cards were attached.

[crashoveride54902]

well then i'm sad...I have a seasonic 1000w plat. psu...it was getting warm with just a 5850 n 7770...and that's off the pcie rails...now i added a 6990 to it and it's getting even hotter...i woulda at least thought it could handle the 2 first cards without a sweat...hmm maybe i got a bum one...it is new...oh well if it goes out i can rma it...7 year warrenty yay...oh and that's with the fan switch to normal and the 6990 underclocked...and all the mem on cards underclocked as well...unless it's picking up the heat from the 6990...open case..no fan to move the air either...but it still was getting warm with the 2 cards lying on my desktop away from the cards so i dunno...hell my seasonic 860w plat. psu is powering a 7970 oc'd n 5970 oc'd and it's not even warm...course it does a box fan blowing into it...

I got actual power figures for 5970. I ran a computer equipped with a 450 watt 80PLUS Gold power supply with a single 5870 in it and mined to get a baseline figure. It came to 175 watts with a kill-a-watt. I added a 5970 on top of that and ran both cores at 1v, 760MHz and 152MHz memory and mined on the 5870 plus 5970. Power increased to 425 watts with a kill-a-watt and the 5970 generated 705 MHash/sec.

Radeon 5970 @ 760/152/1v = 705Mhash/sec @ 250 watts = 2.82MHash/joule.

 This was brave putting those 2 on a 450w supply

It's not brave, it's smart.  He used a Gold PSU, so he probably had close to 450W available on the 12V rails (probably single rail).  If it was a simple Celeron or Sempron 400W could go to the 2 GPUs and if he downclocked the RAM he probably had enough room to throw a 7770 in there too

A cheap 450 PSU will have 240W available on the 12v (maybe 20A), a high end Gold PSU is made for this stuff - no need for overkill.  Quality over quantity.

You are correct. I stopped using cheapo power supplies. 80plus gold or better for me from now on. Entire capacity can be drawn on 12v. Rosewill Capstone 450W. Didn't even get warm. On the other end, I have an Antec TruPower II 550 watt. It's something like 70% efficient, no active PFC, and available 12v power is poor. It shut off when I was furmark testing a Radeon 6970. No other video cards were attached.

[ssateneth]

Just because a power supply gets warm or hot doesn't mean it's a terrible power supply that's going to die in a couple days. It could just be better at pulling away heat from hotspots. Your Seasonics are great. You should not feel like you got ripped off with a trash power supply. They are top of the line. Parts of it are designed to have tolerances to temperatures over 100C.

[crashoveride54902]

ok well i guess i'll just see how long it lasts...Had a OCZ psu for my old 775 system and it lasted 6+years and maybe it would have lasted longer if i didn't move it...after i took it out of the case it never worked again and some caps were blown...could have replaced them but didn't feel the need to..plus it would have been a pain cause it was 5 and 1 was in a tight spot...well thanks for the info

Just because a power supply gets warm or hot doesn't mean it's a terrible power supply that's going to die in a couple days. It could just be better at pulling away heat from hotspots. Your Seasonics are great. You should not feel like you got ripped off with a trash power supply. They are top of the line. Parts of it are designed to have tolerances to temperatures over 100C.

[jdat]

Does it make sense to be mining with 7970, would you loose money or make money ?

When asics kick in, you will be able to sell 7970 as modern gaming cards. Can you say the same for 3+ year old card?