Brand doesn't matter, it's the cooler that matters, try to get one with a dual fan it will have better cooling and will survive overclocking and running 24x7 better. Failing that the Sapphire ones have a large single 92mm fan and 5 heat pipes running off to two large coolers. They are the best single fan models.  |
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In the UK we used to have free solar schemes, You rented your roof to someone who installs solar panels on it, and they let you use as much as you want, while selling any left over to the grid. Sadly the new government austerity measures have reduced the profitability of solar investment schemes like this... they were working too well! Now they've turned it into a bank loan scheme to save the fractional reserve debt note system.  (just like student loans) |
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I think the values are stored in a Linux boot script and not on the card.
My evidence for this is that I've underclocked so much that Linux failed to start after rebooting.
I recovered the situation by re-burning the OS back onto the memory stick and this reset the values.
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Silly question but did you try rebooting after saving your settings? Some things on Linux don't get applied until the boot scripts run. Can be a bit of a hassle if you underclock it enough to stop it rebooting though.  |
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"Would be any problem in using many power supplies for a multi gpu rig instead of one of 1200w??" If using multiple power supplies you have to trick them into thinking they are connected to the motherboard. http://www.youtube.com/watch?v=u6Qb5ZmekNM |
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No problem with GUI Miner and Ati cards.
They only need to be the same for crossfire (doubling gaming performance)
I've mixed 5830s, 6770s, 6850s and 7850s while mining, even play games on GPU0 while mining on the others in the background.
I was using LinuxCoin designed for bitcoin mining that ran off a memory stick, but it also works fine in Windows too.
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I have 2x 7850 they are the twin fan design with large coolers running 12.11beta catalyst.
Together they mine 630Mh/s with 1100 GPU clock, temps are like 57-65c, fan is 50% auto.
They are not cross-fired so I can game on one while mining 300Mh/s on the other. No dummy monitor plug was required. Rig runs at <299w.
I don't mess with the voltages and I'm using GUI Miner and MSI Afterburner and mining on 50BTC (after bad experience with Eligius).
2 BTC pm 2.03 MH/s/W = 48.30 USD pm after power costs at todays prices and difficulty.
Update:
I just tried lowering the voltages and it was a no go. Card seems to have it's own power saving feature that has control of them.
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Ati 5830's are the quickest $/Hash ROI in my experience. You can pick them up as cheap as 5770's but they run cooler,quieter,faster.
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At current bitcoin prices $40-50 you can still cover your electricity bill with graphics cards but this may not last much longer. Use http://www.bitcoinx.com/profit/ to predict your costs and profit. Ati 5830 cards are probably the cheapest they mine as fast as my 7850s (but use a bit more electricity) |
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You might as well wait for Butterfly to produce a working item now.
The said they would be testing their new chip this morning.
Butterfly is quickly running out of excuses so it's make or break this week I think.
I hope it works, as I don't want to spend 650w on electricity costs (Avalon), as bitcoins are not exactly easy to sell to cover the bills.
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It seems like controlling these machines under a single entity would yield more profits. I heard they do have a large Bitcoin farm, but I suspect they don't have the money to develop ASIC alone. Also when you become the market, there is nobody left to sell to, and it ends badly. Example the Hunt Bros. who cornered the silver market. |
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For a service that does millions a day in transactions why the hell does MtGox have such shitty banking? I suspect it's some nerd kid in his bedroom who used to trade pokemon cards and now bitcoin trading is growing out of control. MTGOX = "Magic The Gathering Online eXchange"  http://www.youtube.com/watch?v=C5EegPifcB8 |
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Halving the reward doubles the cost of production. Imagine I mined an ounce of gold, then gave it to king of gold, and he gave me back half, doubling my cost to reward. That's the weird and wacky world of bitcoin mining for ya. The rate of new coin supply is decreasing. |
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everyone changed to 0.7, otherwise they'd have no mining, but try the pools thread for more info and go to last post with your pool name.
I'm on 50BTC and got my yesterdays production back paid today. I don't think I lost much if anything.
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When same quantity of product cost more and more, thats inflation! Inflation is the increase in money supply, more money chasing the same assets, prices rise. Deflation is the decrease in money supply, less money chasing the same assets, prices fall. |
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But if you encrypt your wallet, even if it's stolen it can't be drained of bitcoin. Lies. They can record you key presses so they know your password before they steal it. I would keep your wallet on a machine or linux partition not used for anything else. I suspect people get hacked by their mining software or pirate software. Even the official client has an IRC (alt network) so keep IRC ports firmly blocked in your firewall! Where money is concerned trust nobody! |
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If people are losing Bitcoins left and right ... then their value will go down. There are two bitcoins chasing an asset worth 1 bitcoin. You have one coin, I have one coin. You lose your bitcoin, the bitcoin supply is now half, the item becomes worth 0.5 bitcoin. The value of bitcoin did not go down from your loss, it went up, I can now buy two items. Bitcoin is a deflationary currency. |
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thank god it says "new and unused" 
