How much Kh/s R9 280x Gets?

[sitefive]

What kind of Power Supply do you think would 3x R9 280X need?
I see a good 750w would be good for 2X r9 280x.
but how much would 3 of these cards need?

[grimrog]

between 720 and 750, depending how much im doing on the pc. They are running with a 680w bequiet 80+ bronze psu.

these are my settings:

 -I 13,13 --shaders 2048,2048 -g 2 --gpu-engine 1070,1070 --auto-fan --temp-target 75

I'm using mostly the same on my Asus Top cards, with 1081v in trixx(1012v in GPUz) and 1030 for gpu-engine.

can i harm them with undervolting? does powertune have any considerable effect?

[oroqen]

between 720 and 750, depending how much im doing on the pc. They are running with a 680w bequiet 80+ bronze psu.

these are my settings:

 -I 13,13 --shaders 2048,2048 -g 2 --gpu-engine 1070,1070 --auto-fan --temp-target 75

I'm using mostly the same on my Asus Top cards, with 1081v in trixx(1012v in GPUz) and 1030 for gpu-engine.

can i harm them with undervolting? does powertune have any considerable effect?

Undervolting no, just crashes if you take it too far down vrs clock rate. If anything your decreasing your time before failure, lower volts mean lower temps for GPU core and VRMs, not too mention the power savings over 24/7/365 use, the trick is finding a sweet spot your comfortable with, I've read one guy was running at the low end of 1v 960ish core for 670khash. not sure about powertune i'm using -20 and haven't played with it.

[ChekaZ]

Got 2x R9 280x -> 720kh/s each  at 530W both.

[sitefive]

Got 2x R9 280x -> 720kh/s each  at 530W both.

cool,what kind of brand are they? also overclocked?

also What kind of Power Supply do you think would 3x R9 280X need?
I see a good 650w would be good for 2X r9 280x.
but how much would 3 of these cards need?

[ChekaZ]

Got 2x R9 280x -> 720kh/s each  at 530W both.

cool,what kind of brand are they? also overclocked?

also What kind of Power Supply do you think would 3x R9 280X need?
I see a good 650w would be good for 2X r9 280x.
but how much would 3 of these cards need?

I've shared my settings here:

http://forum.feathercoin.com/index.php/topic,6396.msg47680.html#msg47680

Got 1050W GOLD PSU.

[alivecrypto]

Could any one can tell about full assembling, each and every parts. Please that will be helpfull for newbs like us.

[sitefive]

Do you think I could run 3X r9 280x cards on a 900-950w PSU?
each card seems to take 250wats X 3= 750 and I would have about 150w left for the rest of the system.

[ChekaZ]

Do you think I could run 3X r9 280x cards on a 900-950w PSU?
each card seems to take 250wats X 3= 750 and I would have about 150w left for the rest of the system.

Only if you purchase a good GOLD one. I've had a bad one before - 850W and it couldnt even push out 580W without dying..

[dragonhunter]

Do you think I could run 3X r9 280x cards on a 900-950w PSU?
each card seems to take 250wats X 3= 750 and I would have about 150w left for the rest of the system.

http://www.extreme.outervision.com/psucalculatorlite.jsp

Use this tool to calculate approx. W needed.

[cryptohunter]

Do you think I could run 3X r9 280x cards on a 900-950w PSU?
each card seems to take 250wats X 3= 750 and I would have about 150w left for the rest of the system.

Really if you can get 7950's so much nicer to work with, i have both types. Some get the 7970 to decent hash/kw and good temps, but most people i have come across like the 7950's more.

Mine run easily at 670kh and much cooler and consume less electricity.  The 7970's go to 750kh but i have temp issues and way more problems over all.

wtf amd did not bring out the 280 i have no idea.