Tip: 270 "non-x" @ 490Kh/s = 0,33W / Khs

[johncarpe64]

thanks for sharing..

[1715399348]

1715399348

[1715399348]

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[1715399348]

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[Lauda]

280x costs 2 times (or more) than the 270 non x. Look up the prices, just about anywhere.

Which means that your initial sunk cost is higher with a 280x rig. However, with an equivalent number of cards, the 280x rig would hash at 1.5x the rate of the equivalent 270 rig. The difference in power cost is fairly negligible at current likely profit rates, so the amount of profit realized through time with the 280x rig is much higher.

Then go buy a hundred 290x, they will hash more.

[drakoin]

Congratulations for your new rig. Wow, 6 GPUs.

Code:

]
"gpu-engine" : "1135",
"gpu-memclock" : "1500",

There is no "gpu-vddc" mentioned. How did you undervolt then?
If you haven't undervolted yet, that is a major source of massive energy savings.

While I discovered how to do it, I documented it all in this thread; may it help you, too:
https://bitcointalk.org/index.php?topic=395004

 

[spinx]

Does a (non x, non gigabyte) r9 270 use more than 150W under full load? They only have 1 6pin connection...
Was thinking... 6 of those 270's = 900W max + some new cpu, ram, ... = 100W -> 1000W total usage. Does this seem correct and would a 1200W gold/platinum pull this off?

sry for delayed answer, to much work... :/
My wholse system with 6 x 270 "non-x" consumes about 975W, say 125W for the mobo + other stuff = 850 / 6 cards = 140+ W /each, and the 6pin can only pull 75W, so the rest 67W/card need to be fed from the pci-e, and therefore is very important to have powered-risers. A 1200W gold/platinum would do the job no problem, just make sure it has 1 12V rail with 70amps+.

cheers!

Hey mate, no prob at all, i'm glad i got a response since im on the edge of my seat wanting to order everything...

To reach that '975W', did you undervolt any cards or is this just not worth it with r9 270's? Reason i ask is because:
1) We void the warranty flashing r9 270's bios since they dont have dual bios switch like the 270x.
2) It might not be worth the hassle.

You undervolted the cpu, was that worth it? i believe newer cpu's only use like +-50W.

I would use those USB pcie risers on my ASRock H81 Pro BTC, which come with molex to be powered. Would you make them powered all 6?

I got my eyes on this psu: http://www.super-flower.com.tw/products_detail.php?class=2&sn=16&ID=94&lang=.
Output +3.3V@20A ; +5V@20.0A ; +12V@99.9A ; -12V@0.5A ; +5Vsb@2.5A
12v rail seems sweet right?

Hi!

1) I did not undervolt any cards, all stock volts, if you intend to overclock, undervolting might be a hassle anyway.
2) i dont think you need to flash the bios at all to get nice results.
3) The undervolt/underclock of the cpu was probably not nessesary at all, i was just having some initial problems with the power consumption so i tried to minimize the consuption form every device connected to the mobo, but later i found out that it was due to no 5V load on the 2nd PSU, and after i solved that issue i just didnt change the cpu back.
4) Yes i would try to power all the risers, since most 270 cards only have 1 6pin (75W) they will draw the rest (75W) from motherboard (risers).
5) that psu looks really sweet on the specs, never seen the brad do.

cheers

[spinx]

Congratulations for your new rig. Wow, 6 GPUs.

Code:

]
"gpu-engine" : "1135",
"gpu-memclock" : "1500",

There is no "gpu-vddc" mentioned. How did you undervolt then?
If you haven't undervolted yet, that is a major source of massive energy savings.

While I discovered how to do it, I documented it all in this thread; may it help you, too:
https://bitcointalk.org/index.php?topic=395004

 

i did not undervolt since i intended from the begining to overclock.

[Wipeout2097]

Congratulations for your new rig. Wow, 6 GPUs.

Code:

]
"gpu-engine" : "1135",
"gpu-memclock" : "1500",

There is no "gpu-vddc" mentioned. How did you undervolt then?
If you haven't undervolted yet, that is a major source of massive energy savings.

While I discovered how to do it, I documented it all in this thread; may it help you, too:
https://bitcointalk.org/index.php?topic=395004

 

i did not undervolt since i intended from the begining to overclock.

You are going to destroy those cards in no time.

[spinx]

Congratulations for your new rig. Wow, 6 GPUs.

Code:

]
"gpu-engine" : "1135",
"gpu-memclock" : "1500",

There is no "gpu-vddc" mentioned. How did you undervolt then?
If you haven't undervolted yet, that is a major source of massive energy savings.

While I discovered how to do it, I documented it all in this thread; may it help you, too:
https://bitcointalk.org/index.php?topic=395004

 

i did not undervolt since i intended from the begining to overclock.

You are going to destroy those cards in no time.

Why? My 7950's has been runing oc'd since April -13 no problems

[RckStar]

You are going to destroy those cards in no time.

Why would that be? As long we keep an eye on the temperature, it should be ok...
Extra fans blowing on the 6 gpu's would be advisable i guess...

[Wipeout2097]

Ok, fine, that's just for precaution. Of course yours could be fine, however someone that reads this, ends up with the impression that theirs (other mfg, other coolers, other components, different ambient temperature, less care, low fan speed, etc...) will too.

If you want to debate the point, before, just read other threads and other forums with people toasting their cards...

[spinx]

Ok, fine, that's just for precaution. Of course yours could be fine, however someone that reads this, ends up with the impression that theirs (other mfg, other coolers, other components, different ambient temperature, less care, low fan speed, etc...) will too.

If you want to debate the point, before, just read other threads and other forums with people toasting their cards...

Yes ofc im aware that you will shorten the expected life of the cards. I belive this should be common knowledge around here. Im happy if they last a year or so. Good point made do

[drakoin]

While I discovered how to do it, I documented it all in this thread; may it help you, too:
https://bitcointalk.org/index.php?topic=395004

i did not undervolt since i intended from the begining to overclock.

Of course, you don't have to, but you will have to live with higher temperature, louder fans, more electricity consumption, higher bills, more greenhouse effect - and perhaps even earlier death of the cards.

Even with overclocking, I would give it a shot how far you can undervolt.

And considering the maxing out, running at highest possible khash/s regardless of anything else - read my opinion here if you want to:
http://ecoiner.org/mining-hardware/save-electricity-save-money-undervolting-7970-xfx-self-vbe7-bios-1017/

:-)