Best Hash/Watt GPU Setup, Undervolting

[ivanlabrie]

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the 7950 GPU is still made in 7970s/280x so it is not outdated.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

That guy spams all threads, posts random bullshit to get his post count up.

[carly200]

anyhow:

I got some ideas to improve my aircooled rigs ;-)

the raven rv03 is a crappy case, but the airflow and 90° motherboard arrangement kinda works
(crappy, because it is low quality, like a $50 case, not thought through in many places)


does anybody know how to channel/force the air better through a quad GPU setup?

I know that the HAF-X comes with a GPU bracket (don't know if it fits "all" GPUs)





Also I found this on the net (custom made/3D print) which is what I have in mind.
I might build one from a plastic "icecream-box" or similar.
any suggestions on what to use/buy/build that doesn't make me work 5h on it?





The 290 GPUs have tiny screw holes at the back that I could use to attach something to, but how do I attach a fan to a self made duct?





amd should make more like this:

does anyboy know what "size" the screw holes are at the back of the GPUs?
what are they good for anyways?

[Lauda]

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the 7950 GPU is still made in 7970s/280x so it is not outdated.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

That guy spams all threads, posts random bullshit to get his post count up.

This is incorrect.
Every piece of hardware has EOL. Try sending back the 7950 for a replacement, you will have fun.
Last time I did it with 4 of them I got fiat, and had to wait for the 270x.

Note: ~2months = ~200-300 posts.

[ivanlabrie]

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the 7950 GPU is still made in 7970s/280x so it is not outdated.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

That guy spams all threads, posts random bullshit to get his post count up.

This is incorrect.
Every piece of hardware has EOL. Try sending back the 7950 for a replacement, you will have fun.
Last time I did it with 4 of them I got fiat, and had to wait for the 270x.

Note: ~2months = ~200-300 posts.

Well, to be fair...you do have a point :p

Warranties are a thing to be considered when building a farm.

[Lauda]

Well, to be fair...you do have a point :p

Warranties are a thing to be considered when building a farm.

Imagine if a set of GPUs fail, and having to wait a month or two for their replacements?
Since my connection to the selling company is very good, they've offered me 2 options either to wait out (around 2 months) or take the cash (they paid me back at the price which I bought them at, even though they are much cheaper now). Obviously I took option B.

[carly200]

hey, could you please get out of my thread with your stupid 7950s EOL problem?

if you are mining on used cards for cheap, then warranty is not the thing you should worry about!
if you are worried, get a newer model 280x is there... quite similar. (i know that it is the 7970 and not the 7950)


so end of story. please leave now!

[carly200]

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 is a really nice result. how did you measure the 136W? It seems very low. what voltage does it run on? can you post a screen?
sorry for not believing everything that gets posted...

anyways, if it is true, then that is amazing!

I currently hope that the BIOS optimizations by TheStilt on the 290s will increase performance or drop power draw (which is too high). although the platform (Hawaii) is new, it looses sout to Tahiti and almost to old Pitcairn...

[Silvano]

i have a "watt meter" on the wall.
now with browser open and downloading, wattmeter sign a consumption of 203w.
my desktop on idle sign normally 65w
so 203-65=138w.

it must be said that i have a PSU corsair VS650 without any certification. so i think that my new rig i will start to buid tomorrow, whit a PSU 80+ gold, will use a few less power than this, i estimate 4 or 5% less.

here, in Italy, i pay power 0.2443 euro kWh, it's about 0.3322$ per kWh. saving power is my only way to maximize my profit.

GPU Sapphire HD7950 OC (11196-19-20g)



my "watt meter"

[ivanlabrie]

i have a "watt meter" on the wall.
now with browser open and downloading, wattmeter sign a consumption of 203w.
my desktop on idle sign normally 65w
so 203-65=138w.

it must be said that i have a PSU corsair VS650 without any certification. so i think that my new rig i will start to buid tomorrow, whit a PSU 80+ gold, will use a few less power than this, i estimate 4 or 5% less.

here, in Italy, i pay power 0.2443 euro kWh, it's about 0.3322$ per kWh. saving power is my only way to maximize my profit.

GPU Sapphire HD7950 OC (11196-19-20g)



my "watt meter"

If that's your main concern, head to the yacminer thread and look at thirtybird's improved yacminer, and his R7 240 4GB results...those things make something like 0.00765btc/day whilst not even using a pci-e connector (75w or less, from the slot).

[jadagles]

So I've read about building rigs and such but there is a thing that I don't understand. I got a p5kr asus mobo this one http://www.asus.com/Motherboards/P5KR/#specifications , with 2 x PCIe x16 (blue @ x16 mode, black @ x4 or x1 mode) supports 1 x PCIe x1 and 3 x PCI. I have a quad q6600, 2 GB DDR2. Can I use this computer that I'm working and writing now from, to put let's say 3 R9 R270, don't they require pci 3.0? And what about the risers. How to use them? Must I buy a mobo that has 4 slots pcie x16 to build a mining rig? A mobo with 4 slots is a lot of money.

Can I use this mobo Gigabyte 990FX AM3? If yes, please make a detail explanation of how? A raiser from x1 to x16 can deliver the same amount of hashpower or not, it is the same with 4x to 16 and 8x to 16?

Thank you for your time.

[carly200]

So I've read about building rigs and such but there is a thing that I don't understand. I got a p5kr asus mobo this one http://www.asus.com/Motherboards/P5KR/#specifications , with 2 x PCIe x16 (blue @ x16 mode, black @ x4 or x1 mode) supports 1 x PCIe x1 and 3 x PCI. I have a quad q6600, 2 GB DDR2. Can I use this computer that I'm working and writing now from, to put let's say 3 R9 R270, don't they require pci 3.0? And what about the risers. How to use them? Must I buy a mobo that has 4 slots pcie x16 to build a mining rig? A mobo with 4 slots is a lot of money.

Can I use this mobo Gigabyte 990FX AM3? If yes, please make a detail explanation of how? A raiser from x1 to x16 can deliver the same amount of hashpower or not, it is the same with 4x to 16 and 8x to 16?

Thank you for your time.

I could answer your questions, but they really don't belong in this thread.

you could search a little bit more, make your self knowledable first! then open a newbee thread and ask those questions.


only one thing
GPUs for mining require ANY PCIe slot (old slow ones, or 1x will work too), you only need to find a way to plug them in (like with a riser from 1x -> 16x)
you only need better pcie if you want to game, or do other stuff..
hashpower comes from the GPU not the connection to the Mobo. that is only to RUN the gpu at all.

now leave this thread please!

[ivanlabrie]

Here's some yacoin figures for you, figured they'd interest you since power is so expensive there:

Model: Sapphire R7 240
Stream Processors: 320   
Memory: 4GB
Clock (MHz)   : 1100
Memory Clock (MHz): 1000   
TDP: 25w
kH/s: 2.78
Software: YACMiner 3.4.0      
Flags: --worksize 128 -g 2 --lookup-gap 2 -R 640 --thread-concurrency 24576   
Nfactor: 14
Power usage measured at wall
Estimated profitability: 186,5 Yac per day (0,005 BTC)

[bedugo]

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?

HI,

Can you post the setting for the 280x?

Thank you

[carly200]

might have to look into that (in a couple weeks/months), right now scrypt still works ;-)


I kinda like LTC so it is hard for me to even mine something like dogecoin (for profit), but then there is a huge community thats not nerdy behind it... it can be a success...
still having a hard time to tinker with other coins xD


I am still surprised by the results form the 7950... how come that it is "so much better" than a 7970/280x it is the same thing after all...

also wondering (read it in another post) what the 280 (non-x) will be, and if it come to see live...
same with dual-hawaii.

[Lauda]

hey, could you please get out of my thread with your stupid 7950s EOL problem?

if you are mining on used cards for cheap, then warranty is not the thing you should worry about!
if you are worried, get a newer model 280x is there... quite similar. (i know that it is the 7970 and not the 7950)


so end of story. please leave now!

Your thread is bad and your knowledge is limited.
The EOL problem is everyone's problem.
http://en.wikipedia.org/wiki/End-of-life_(product)

[carly200]

the 280x settings?

they are in the the post you quoted...

just plain default 280x settings... just chainged engine for best ratio at my low voltage...

[carly200]

hey, could you please get out of my thread with your stupid 7950s EOL problem?

if you are mining on used cards for cheap, then warranty is not the thing you should worry about!
if you are worried, get a newer model 280x is there... quite similar. (i know that it is the 7970 and not the 7950)


so end of story. please leave now!

Your thread is bad and your knowledge is limited.
The EOL problem is everyone's problem.

yes, you are absolutely right. i wish my thread was not so bad and my knowledge was not so limited... if only I could find someone like you to enlighten me..

is it slapstick time already?

[Silvano]

@carly200

i made accurate counts.
results for R9 280x are very different from the results of 7950.

in my counts, 7950 is preferable to run undervolt like my own, if day profit is under 11.09$ per Mhs
instead, for R9 280x is preferable to run undervolt only if profit day is below 6.69$ per Mhs

for this counts i use this data:
hd 7950  (mine) undervolted @ 520 khs per 135w, overclocked @620khs per 275w
R9 280x (the one of a friend rig) overclocked @760khs per 308w, undervolted @575khs per 153w (take data from the "save money 7970 thread" here)
costs of power: 0.2443 euro kWh. (i pay this in Italy)

[ivanlabrie]

@carly200

i made accurate counts.
results for R9 280x are very different from the results of 7950.

in my counts, 7950 is preferable to run undervolt like my own, if day profit is under 11.09$ per Mhs
instead, for R9 280x is preferable to run undervolt only if profit day is below 6.69$ per Mhs

for this counts i use this data:
hd 7950  (mine) undervolted @ 520 khs per 135w, overclocked @620khs per 275w
R9 280x (the one of a friend rig) overclocked @760khs per 308w, undervolted @575khs per 153w (take data from the "save money 7970 thread" here)
costs of power: 0.2443 euro kWh. (i pay this in Italy)

A 7950 draws 160w undervolted at 0.962v...and pulling 660-700kh/s with an optimized bin file and sgminer.
You should read this thread: https://litecointalk.org/index.php?topic=12369.0
It debunks various myths regarding scrypt mining...
And try this: http://www.reddit.com/r/litecoinmining/comments/1va8g2/ann_sgminer_400_release/

[Silvano]

@carly200

i made accurate counts.
results for R9 280x are very different from the results of 7950.

in my counts, 7950 is preferable to run undervolt like my own, if day profit is under 11.09$ per Mhs
instead, for R9 280x is preferable to run undervolt only if profit day is below 6.69$ per Mhs

for this counts i use this data:
hd 7950  (mine) undervolted @ 520 khs per 135w, overclocked @620khs per 275w
R9 280x (the one of a friend rig) overclocked @760khs per 308w, undervolted @575khs per 153w (take data from the "save money 7970 thread" here)
costs of power: 0.2443 euro kWh. (i pay this in Italy)

A 7950 draws 160w undervolted at 0.962v...and pulling 660-700kh/s with an optimized bin file and sgminer.
You should read this thread: https://litecointalk.org/index.php?topic=12369.0

i know "theStilt" thread. i have optimized CL file for sgminer 4.0.0
i not use for now special bios whit mem optimized by theStilt because i just use memclock @800 which is a right optimized step.
i will try to run my 7950 at 660/700 (my max was 630) and i will try those bios, if really consumption is 160w, that is wery better than my actual setup. i will see and report.