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post #4021 of 22321

So I am thinking my options right now are:  2x  270x in crossfire, 2x 280 in Crossfire, or 2x 280X in Crossfire.  I cannot do a 290X because my credit card maxes at $500.  Which of the three options will yield me the most cost effective hashrate?

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Swamplog 2.0
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post #4022 of 22321
Quote:
Originally Posted by Playapplepie View Post

So I am thinking my options right now are:  2x  270x in crossfire, 2x 280 in Crossfire, or 2x 280X in Crossfire.  I cannot do a 290X because my credit card maxes at $500.  Which of the three options will yield me the most cost effective hashrate?

Should give you an idea. Those cards are near the bottom

https://litecoin.info/Mining_hardware_comparison
post #4023 of 22321
Thread Starter 
Just a reminder, if you haven't already, please include your cpu testing results in my thread here: http://www.overclock.net/t/1448495/cpu-mining-extravaganza-primecoin-and-protoshare-mining-statistics

Repeated entries are kinda pointless, but might be good to see how mining scales with clocks for example.
post #4024 of 22321
So I contacted AMD about my 7950, I wanted to know what their reccomended maximum temperature is for 24/7 use and they had this to say:

I think none of PC is designed for running in 24x7, even if you can control the temperature in a lower level, like 40C, 50C, but the other components in your PC will get harm as well. I think it is the whole PC can’t afford to run without break. Even if you finally use your PC in 24x7 successfully this time, but maybe suddenly one day, it just can’t be workable, and a new PC will cost you more. So, anyway, I don’t suggest doing so.

So I'm not getting a straight answer. I think that they just don't want to give me a number because it the card craps out they won't have to replace it.
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post #4025 of 22321
Quote:
Originally Posted by meckert15834 View Post


Should give you an idea. Those cards are near the bottom

https://litecoin.info/Mining_hardware_comparison

 

Thanks, I actually saw my card on there.  The hash rates don't match up though.  I'm getting 365kh/s, but the chart shows a bit over 400.  Anyways,  the Asus 280 shows a good hash rate of 770.  I could grab 2 of those and get myself in business. 

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post #4026 of 22321
Quote:
Originally Posted by Playapplepie View Post

Thanks, I actually saw my card on there.  The hash rates don't match up though.  I'm getting 365kh/s, but the chart shows a bit over 400.  Anyways,  the Asus 280 shows a good hash rate of 770.  I could grab 2 of those and get myself in business.

Are you running your cards stock? Have you tried to overclock/undervolt yet?(better hash rate and less power)

Download MSI afterburner and play around with settings you'll break 400
post #4027 of 22321
Quote:
Originally Posted by meckert15834 View Post


Are you running your cards stock? Have you tried to overclock/undervolt yet?(better hash rate and less power)

Download MSI afterburner and play around with settings you'll break 400

 

I have an overclock on the memory of 100mhz to get it to 1500mhz.  The core has a 25 mhz dump.  How do I tweak voltages in Afterburner? Is that the power limit option?  Core voltage is greyed out and unusable for me.

Swamplog 2.0
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Swamplog 2.0
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post #4028 of 22321
Quote:
Originally Posted by Deadboy90 View Post

So I contacted AMD about my 7950, I wanted to know what their reccomended maximum temperature is for 24/7 use and they had this to say:

I think none of PC is designed for running in 24x7, even if you can control the temperature in a lower level, like 40C, 50C, but the other components in your PC will get harm as well. I think it is the whole PC can’t afford to run without break. Even if you finally use your PC in 24x7 successfully this time, but maybe suddenly one day, it just can’t be workable, and a new PC will cost you more. So, anyway, I don’t suggest doing so.

So I'm not getting a straight answer. I think that they just don't want to give me a number because it the card craps out they won't have to replace it.

You sure you contacted AMD? They can't even speak proper English lol
post #4029 of 22321
Quote:
Originally Posted by gtsteviiee View Post

Hey guys, is it okay for me to use 1 unpowered riser x1 to x16? I have 2 r9 280x on the stock pcie of the motherboard and I want my 3rd one to rise. My mobo is Asrock Z87 Extreme4 with EVGA SuperNova 1300w

Anyone?
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post #4030 of 22321
Quote:
Originally Posted by gtsteviiee View Post

Anyone?

I think you need the power for the computer to be able to read the GPU. Not 100% sure though.
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