reference design is probably the best bet because the air goes straight from the card to outside the case. if i hear you speaking about 100%, i get the chills. 50% was so damn loud, i couldn't imagine going for 100%. for dedicated rigs in a different room, it's okay, but having the fans blow at 100% in the room you browse the internet is way too loud.
I am using this Vantec tornado fan on the top of my Lian Li case. It's loud like jet engine but sure does keep the cards cool. It has tremendous airflow, even at moderate rpms. http://www.newegg.com/Product/Product.aspx?Item=N82E16811999612&cm_re=vantec_tornado-_-11-999-612-_-Product |
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Oh man.
If you had the money to buy into solar or wind generation you'd be much better off to put it into more GPUs instead. Other than bragging rights to say you are "totally renewable" there's no way it would be profitable and not very earth friendly either.
You may be able to get your electric for free after you invest in the gear but the up front costs both in money and environmental impact of equipment would exceed the savings for quite some time. Probably you would have to keep adding more solar/wind to keep up with increasing difficulty and it would continually get harder to realize any payback.
No, if you want to save the environment then don't start mining.
Just like in the real world with coal.
In Texas Green Mountain Energy supplies wind generated power. Since power is deregulated there, one can use this company. http://www.greenmountainenergy.com/IMHO this is a nice way to support renewable energy without capital investment. |
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Someone please correct me if I am wrong...
I think what is happening is that Win7 can only see a max of four GPUs. You will have to move to Linux which can see up to eight. I think that you are having the same problem that I am in that the mining software is only using one GPU from two of your three cards. I just posted a few minutes ago and I have only one 6990 in a Win7 install but can only see one GPU for mining purposes. If you open AMD Overdrive how many GPUs do you see? I can see both of mine there but it is poclbm that does not see two for me.
Regardless the max that you will get working under Win7 is four so you have to make the move to Linux or take one card out.
BTW that is a great mobo... I am using it in a rig with four 6870s.
Good luck and if you figure anything out under Win7 please post. I will also let you know if I find an answer to my problem.
I had to connect vga / hdmi cable with an active monitor to enable my second gfx card in Windows 7. |
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I did this switch a couple of years ago and ended up paying almost exactly the same amount as before. The de-regulated company i purchase the energy "supply" from charges less, but my Utility company is still the one delivering it -- and they charge a "delivery" fee which brings my total electricity bill back up to the original amount (once you factor in flat fees, taxes, surcharges, etc).
It's a really stupid system. I hate corporations.
I was actually going to ask this question in a new thread, but maybe you can answer it: I live in Texas, and am with Gexa Energy (I hate them), my bill has both 9.6 cents per KWh and 10.9 cents per KWh listed on it (either one is fine with me), but since I started mining I've been paying close attention to it, and it has a TDU charge of $100 for the past month where I was mining. WTF is this, does anyone know? My TDU is centerpoint, and my provider is Greenmountain (100% wind power). My total cost per KWh inclusive of everything (taxes, service charges, etc) is 14c. |
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Yup worked for me exactly as you said. My 6870 went from 300 to 308. Thanks!
It definitely worked for my 5830! Awesome thanks a bunch bitless  |
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I'll wait for everyone to report back before I try out something from a guy named goxed  |
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I see some Ma3() function in your kernel (I don't have it), which seems to be almost the same as the original Ma(), and my optimization could be applied to it as well. Why didn't you change this Ma3()? Any particular reason? Good catch I have been playing a little bit with the kernel. this macro was added by me and is not part of original kernel. |
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This method actually caused a decrease of 30%. I went from 26.81 MHash/s down to 18.71 MHash/s.
I have used this with a Radeon 5830 card. from 305MH/s to 315Mh/s Here's some proof. new kernel http://imgur.com/JcMmZold kernel http://imgur.com/YrRuL |
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you have to change this line in kernel.cl. tested this with poclbm kernel only.
u W0, W1, W2, W3, W4, W5, W6, W7, W8, W9, W10, W11, W12, W13, W14, W15;
to
__local u W0, W1, W2, W3, W4, W5, W6, W7, W8, W9, W10, W11, W12, W13, W14, W15;
basically, add a __local key keyword to this line and it should increase your performance.
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Real men have their own servers  |
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Boatloads of BTCs  |
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Past a certain point the cards won't support CUDA or Firestream, so no, you can't have a miner that will simply run on anything. Very old cards probably aren't worth running the software on anyway.
Moore's law states that complexity in a computer system doubles every 18 months. It's held true for more than 30 years (and actually seems to be accelerating). So, if your card is 18 months old, it's half as fast as a modern card. Three years old and it's 1/4 as fast. Four and a half years and it's 1/8. Six years and it's 1/16.
It's unfortunate that those with very restricted capital and old hardware can't do much on bitcoin, but there's nothing that can be done about it. You have to either get better hardware, suffer with what you've got or don't mine at all. Sorry.
Actually TSMC did not follow the Moore's law in 2010. They could not bring up the 32nm node, thus both Radeon 58xx and 69xx are made on 40nm nodes. |
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The point is not electrical efficiency, nor reducing impact on other apps. Rather, it is heat. My CPU is far hotter, and thus my fans run much faster, and are much noisier, when the CPU is at 100%. My computer's fan is extremely loud.
At 20%, the fan doesn't kick in, so I'd be fine with having that constantly running.
Also, I don't intend to necessary participate in a pool. I'd like to mine directly and have a (small) shot at earning 50 BTC.
Furthermore, I would be interested in doing something similar with GPU mining, perhaps simultaneously with a little bit of CPU mining. How's the GPU on a MacBook Air?
There are two ways I deal with this issue. If you have lets say a quad core or six core cpu, you could try to use just one core. Or another method (not so suitable if you are using your computer while mining) would be to downclock your CPU to the lowest clock frequency supported. On AMD Phenom II it's 800 MHz. It can be done in Windows 7 by selecting 'Power Saver' radio button in Control Panel, Hardwdare and Sound, Power. |
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0.2 btc per day with a Radeon 5830
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ATI has more cores than nvidia which makes GPU mining much faster.
Just like AMD are better CPU miners than Intel.
Yes true, but IMHO a Radeon core != Geforce core especially when it comes to executing SHA 256 operations. |
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Thanks for the comments.
Oh, I forgot to mention that I bought the Diamond 6950 1GB card for use with my current desktop and not with the new rig.
This card has a BIOS switch and wanted to explore feasibility of unlocking the shaders. If the unlock operation is successful, I may buy few more of these.
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