R9 280X - 15Mh/s

[chup]

Sure.

[Eliovp]

Core 1170 will get you at that speed yeah..

[YIz]

Not sure how you get such low temps but my 280X already runs at 80c without that high of a clock speed.

[EnacDomains]

I've been able to squeeze a bit above 15mh but that's a lot of fans required to keep it cool

[gollumist]

Not sure how you get such low temps but my 280X already runs at 80c without that high of a clock speed.

Those temperatures are possible at this overclock only with water cooling!

[arielbit]

Not sure how you get such low temps but my 280X already runs at 80c without that high of a clock speed.

Those temperatures are possible at this overclock only with water cooling!

or it is cold in his place

[Getcoinsite]

I've been able to squeeze a bit above 15mh but that's a lot of fans required to keep it cool

I get about 12 MH/s. I undervolt it to 0.86V and run at core/memory 800/1000MHz. My electriicty price is high.

[YIz]

Not sure how you get such low temps but my 280X already runs at 80c without that high of a clock speed.

Those temperatures are possible at this overclock only with water cooling!

or it is cold in his place

Yea, he probably lives in a cold country. I doubt someone has a custom loop with so many cards.

[antantti]

How much is 7970/ 280x doing on EXP currently? Could be more profitable for tahiti owners?

[adaseb]

How much is 7970/ 280x doing on EXP currently? Could be more profitable for tahiti owners?

Its like 30-40% faster but the pay is less so in the end you make the same amount. The calculators aren't accurate.

It also uses a little more power.

[chup]

Not sure how you get such low temps but my 280X already runs at 80c without that high of a clock speed.

Those temperatures are possible at this overclock only with water cooling!

Wrong. No water cooling. Sapphire Vapor-X. Down volt with Trixx. Soon or a later I will have to dismantle and change cooling adhesive at the one that can't keep with other's low temperatures. And I didn't blow dust from them for almost a year. 

[newmz]

I used to have 2 x 280Xs in my rigs and I sold them on Ebay because they use SO MUCH electricity for a pretty low hash-rate. I had them core overclocked to 1150 and they did 17-18mh/s. Far better to use a 380. With a 380 at core 800, mem 1500 I get 20-21mh/s and using much less power. Or a 290/x at core 1100 mem 1125 gets me 30mh/s but uses a lot of power.

There was some discussion earlier about how flashing a BIOS would void warranty? Who would still have a 280X under warranty anyway? They are about 4 years old aren't they?

[Bostast]

I used to have 2 x 280Xs in my rigs and I sold them on Ebay because they use SO MUCH electricity for a pretty low hash-rate. I had them core overclocked to 1150 and they did 17-18mh/s. Far better to use a 380. With a 380 at core 800, mem 1500 I get 20-21mh/s and using much less power. Or a 290/x at core 1100 mem 1125 gets me 30mh/s but uses a lot of power.

There was some discussion earlier about how flashing a BIOS would void warranty? Who would still have a 280X under warranty anyway? They are about 4 years old aren't they?

If you underbvolt the 390, to about 1.000V and 970MHz, you can get about 27.5 MH/s. But use a lot less power.

[adaseb]

What voltage are yours set to run at 1170Mhz core?

Problem running at that large Mhz is that you need a high voltage and they become very bad at power consumption.

I run most of mine at around 1V and it runs 1070/1600

[chup]

What voltage are yours set to run at 1170Mhz core?

Problem running at that large Mhz is that you need a high voltage and they become very bad at power consumption.

I run most of mine at around 1V and it runs 1070/1600

Depend on card: 1.137 or 1.112V. At 1070 they can run on 1.087 stable. Changing them (slowly) for 480 and 470.

[adaseb]

What voltage are yours set to run at 1170Mhz core?

Problem running at that large Mhz is that you need a high voltage and they become very bad at power consumption.

I run most of mine at around 1V and it runs 1070/1600

Depend on card: 1.137 or 1.112V. At 1070 they can run on 1.087 stable. Changing them (slowly) for 480 and 470.

So they use about 175Watts each correct?

[chup]

So they use about 175Watts each correct?

Huh, never disconnected one to do precise measurement. Two rigs 5x280x and 1x290, 1x470, 2x480 pulling 1,65kW from wall for 200+MH/s

[adaseb]

So they use about 175Watts each correct?

Huh, never disconnected one to do precise measurement. Two rigs 5x280x and 1x290, 1x470, 2x480 pulling 1,65kW from wall for 200+MH/s

If I had to guess

5x 280x = 180Watts each X 5 = 900
290 = 250 Watts
470,480 = 150 Watts x 3 = 450 Watts

Total ~ 1600

[malekbaba]

What is the best driver version to mine etc or eth in AMD 7950?  I am asking the question in different thread but no one replied.

[chup]

What is the best driver version to mine etc or eth in AMD 7950?  I am asking the question in different thread but no one replied.

The one that gives you undervolting capability with Afterburner or Trix. 15.7.1 works for me.