Best Hash/Watt GPU Setup, Undervolting

[carly200]

just some updates:

I tried 280x, 290 and going for 270 now..


290s/quad-aircooled
have a quad 290 in a raven rv03 air cooled... it gets hot, but it works (but I would say close to the limit). heat really increased power draw.
in windows (with every card maxed to 895-905kH and reduced voltage as much as stability allows) the rig draws 1350W (1320-1400W) and over 1500 when not undervolted.

so for now I keep that one on windows ;-)



280x
best efficiency so far is with a 280x (sapphire toxic) at 757kH (1089Mhz, rest is standard 280x settings). i undervolted it (kinda tricky, as it comes stock at 1100 clocks and high voltage (power draw monster!!!). undervolted it draws ~220W (card alone), which is around the best kh/watt I have seen on the net!


270s
i am going to try some 270s now, the idea is to squeeze them between 290s to get airflow/temps a little bit more under control, and also running more efficient (also moneywise) maybe on smaller PSUs.
btw. 1500W Enermax Platimax is just great!


anybody running a quad 270/270x setup? or has anybody modded/undervolted 270s for best hash/watt?

[goin2mars]

just some updates:

I tried 280x, 290 and going for 270 now..


290s/quad-aircooled
have a quad 290 in a raven rv03 air cooled... it gets hot, but it works (but I would say close to the limit). heat really increased power draw.
in windows (with every card maxed to 895-905kH and reduced voltage as much as stability allows) the rig draws 1350W (1320-1400W) and over 1500 when not undervolted.

so for now I keep that one on windows ;-)



280x
best efficiency so far is with a 280x (sapphire toxic) at 757kH (1089Mhz, rest is standard 280x settings). i undervolted it (kinda tricky, as it comes stock at 1100 clocks and high voltage (power draw monster!!!). undervolted it draws ~220W (card alone), which is around the best kh/watt I have seen on the net!


270s
i am going to try some 270s now, the idea is to squeeze them between 290s to get airflow/temps a little bit more under control, and also running more efficient (also moneywise) maybe on smaller PSUs.
btw. 1500W Enermax Platimax is just great!


anybody running a quad 270/270x setup? or has anybody modded/undervolted 270s for best hash/watt?

Hey I have a question about your 290 non x setup. I'm pulling 943kH/card (aircooled, 2 cards on risers unless I can keep ambient temp to 45deg F, stable for a week w/o reset) out of my setup and am wondering what you used to measure your power draw? Also what kind of PSU setup do you have to run 4 of these? Do you know its efficiency? Also do you use afterburner to undervolt?

[carly200]

how do you pull 943kH?

elpdia cards are around 1005 clocked (few more or less to get the peak), hynix around 1015

i have them right on the board, so air cooling is limited, and close to the max ;-)
pwer draw with kill-a-watt
enermax platimax 1500
i use afterburner to set all undervolts manually, have tried them on a testbench for some time. very individual, not too much to gain) :-(

its on a board/cpu that draws around 60-70W at the wall
=>1350-70W to 1500-65W => 1280 to 1435W divided by 4 GPUs -> 320 to ~360W, minus around 10% for PSU efficiency
so 290 - 325W (of course there may be individual differences between cards...)

[goin2mars]

how do you pull 943kH?

elpdia cards are around 1005 clocked (few more or less to get the peak), hynix around 1015

i have them right on the board, so air cooling is limited, and close to the max ;-)
pwer draw with kill-a-watt
enermax platimax 1500
i use afterburner to set all undervolts manually, have tried them on a testbench for some time. very individual, not too much to gain) :-(

its on a board/cpu that draws around 60-70W at the wall
=>1350-70W to 1500-65W => 1280 to 1435W divided by 4 GPUs -> 320 to ~360W, minus around 10% for PSU efficiency
so 290 - 325W (of course there may be individual differences between cards...)

Try out 1050/1450 @ 32765, i20 to push it a little bit. I get 923 here

Try out 1075/1470 @ 32765, i20 to push it further than that. I get 943 here.

Like I said before, the higher rate is really only sustainable w/ risers (know you don't like those) if you can't keep ambient around 45F.

Nice PSU, it's nice to know that I might be able to run them all on one PSU. . my goal i also to have 4 cards running inside the case and not on risers. I had been figuring I'd need a 1600w or multiple psu's (cpu is a 4820k for cpu mining pulling ~60-80w itself) at least so it's nice to see i can go lower.

The first rate I could keep going with a little higher ambient but you're losing a bit of hash.

I've been waiting for a few weeks for some kill a watts and havent gotten then yet.

[carly200]

no, I won't push the cards above 1020Mhz, they are hot anyways and will draw another 50-100W if I do that, no way to undervolt them, they might even need overvolting... where is the sense in that?

also i get best results at 1500Mhz memory.

[goin2mars]

no, I won't push the cards above 1020Mhz, they are hot anyways and will draw another 50-100W if I do that, no way to undervolt them, they might even need overvolting... where is the sense in that?

also i get best results at 1500Mhz memory.

Will post power consumption when kill a watts get here. Should be only a few days now

[carly200]

since my cards are slot by slot on the board without risers, there is no way I can improve cooling (unless I put them outside ;-) )
ambient temperature is nd 16°C right now and the GPUS are all around/below 80°C

[akaCash]

This has been an excellent thread, and I'm glad you kept it going. I just recently got a pair of 270x's and have been in love with them so far. I don't know enough about power consumption to really speak to you initial question or thought as to the the most efficient, but this thread is actually helping me to understand a little better so thank you for that. After researching as best I could the price vs the kh/s and took into account how the prices were raised on certain cards I found the 270x to be the best value. I'm curious to see how it performs in your tests. Thanks again for all this and have a great day.

[carly200]

just got my first 270 sapphire dual-x going today, not finetuned yet,
but it draws around 160W and i have it hashing at ~460kH

it could be that in a dedicated setup/rig with good spacing and risers, that 270 is a good choice (but keep in mind the added price for risers)

right now it is slightly more efficient than my 290s

have a look at this rough calc (just a screenshot), euro prices, some in german (sry), and powerdraw is hidden in the formulas, but this is how I am deciding...

[Giggety]

just some updates:

I tried 280x, 290 and going for 270 now..


290s/quad-aircooled
have a quad 290 in a raven rv03 air cooled... it gets hot, but it works (but I would say close to the limit). heat really increased power draw.
in windows (with every card maxed to 895-905kH and reduced voltage as much as stability allows) the rig draws 1350W (1320-1400W) and over 1500 when not undervolted.

so for now I keep that one on windows ;-)



280x
best efficiency so far is with a 280x (sapphire toxic) at 757kH (1089Mhz, rest is standard 280x settings). i undervolted it (kinda tricky, as it comes stock at 1100 clocks and high voltage (power draw monster!!!). undervolted it draws ~220W (card alone), which is around the best kh/watt I have seen on the net!


270s
i am going to try some 270s now, the idea is to squeeze them between 290s to get airflow/temps a little bit more under control, and also running more efficient (also moneywise) maybe on smaller PSUs.
btw. 1500W Enermax Platimax is just great!


anybody running a quad 270/270x setup? or has anybody modded/undervolted 270s for best hash/watt?

I have the sapphire 280x dual x OC edition (x14 cards)

Does undervolting takes down the noise too ?

[carly200]

280x dual-x.... what noise? 

the 290s (reference) are noisy... all other cards... not to me

of course may undervolting reduce noise, but only if those cards have good cooling anyways and are not running at their limits.

undervolting may shave of 20-50W (not possible on every card), but imagine 30Wx15 cards --> way less to cool ;-)

[Amph]

mine 280x toxic run at 750 kh/s with 1v vcore

1080/1500 powertune 20

-g2 -td 8192 -i 13


get the 280x toxic, is the best, you need just to flash the bios to undervolt it

[carly200]

agree, my 280x toxic is the best.

[ivanlabrie]

Best hash/watt? Hmmm, UTC on a GTX 780.

[Lauda]

Since when i that extra few W that much important nowadays? The electricity is too cheap for me even to bother with undervolting.
As for GPUs the 270 or 270x are your best choice.

[carly200]

i pay 0,36 USD / KWh
every watt matters

[Lauda]

i pay 0,36 USD / KWh
every watt matters

I pay 0.1 at most.  

[Silvano]

My Sapphire HD7950 run stable @520Khs and use 136w = 3.82Khs/w

i read someone says: "stay away from 7950" yes, if you dont know how to undervolt, and you dont care about profit, stay away from 7950.

ps: hd 7950 vddc is unlooked.

[Lauda]

My Sapphire HD7950 run stable @520Khs and use 136w = 3.82Khs/w

i read someone says: "stay away from 7950" yes, if you dont know how to undervolt, and you dont care about profit, stay away from 7950.

ps: hd 7950 vddc is unlooked.

That card is reaching its EOL, stay away from it.

[carly200]

i pay 0,36 USD / KWh
every watt matters

I pay 0.1 at most.   

I don't care! this is not what this thread is about. I am looking for maximum power-efficency and not moving to your undemocratic country!

My Sapphire HD7950 run stable @520Khs and use 136w = 3.82Khs/w

i read someone says: "stay away from 7950" yes, if you dont know how to undervolt, and you dont care about profit, stay away from 7950.

ps: hd 7950 vddc is unlooked.

That card is reaching its EOL, stay away from it.

there is no EOL for mining

the 7950 GPU is still made in 7970s/280x so it is not outdated.

please stop spamming this thread with things that don't belong here!