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I have mine at 320Mhashes/s each card. Much higher than 860Mhz and I'll eventually get a crashed display driver, and one card will stop mining.
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More downtime.... hmmmm.... I'll be taking my 1.8 G/hashes somewhere else maybe.
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Are there other dev boards that have more FPGA's per board that would make things more cost effective? $300 for 50M hashes is steep. If one could get a board for $500 with 10 FPGA's on it, that would be more worth it.
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My 2 cards currently run at 60-65C, thats with a overclock from 725 to 825Mhz. My motherboard has a space between the two cards, so that makes a big difference.
I live in one of the hottest places in the world, where temps during the summer can hit up to 117F.
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no puppose.
saves about 5W but cost some MH/s(about 10-40MH/s drop, depend deep of downclocking and GPU model. ~20MH/s for 250 Mhz on 5870, for example).
slightly improve cooling situation for GPU's with badly designed power subsystems[VRM's/IC's without heatsinks and without strong airflow], unsuitable for mining anyway.
if you care about GPU health put extra-fans in case instead. of [better]invest to water-clooling system. for both GPU, GPU subsystem, CPU, mobo chipset, with external radiator[without fan. huge, expensive, but silean and efficent beast]and even with optional heatsink for PSU[relatively rare product]
Did you read my post? Your saying it "saves about 5W." Have you actually MEASURED this? In my case turning the memory clock down 100Mhz I observed an INCREASE in wattage by about 20-30W! With my 5830's, turning down the memory clock from 1000Mhz to 175Mhz decreased power consumption by 40-50W (2 cards)! Not only that but my hash rate went up as well! I have my 5850 set to 344MHz to get the Mhash boost, never noticed any issues with performance outside of games.
Card model? OS? Have you measured wattage of the rig? |
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Wow, glad im not alone in this. I see other people talking about downclocking their 5850's. I wonder if their wattage has increased as well.  Amazing that this 58-series cards behave so differently. 5830 loves being downclocked. 5850 screams at you! :p |
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So I have 2x 5830's in another machine, and have the Core turned from 800 to 965Mhz with no stability issues and I keep temps <80. I just got 2x 5850's and put them in a new rig. The cards are Saphire Extreme's. I tried underclocking the memory to 500Mhz. Instantly froze the entire screen. So I then rebooted and just tried a small downclock. I downclocked to 900Mhz. I looked at my Killawatt meter and was surprised to see the wattage INCREASE by about 30 watts! Why would it use more power when I'm turning down the memory clock?!?! Doesn't make any sense. I reduced the wattage significantly on my 5830's by downclocking the memory. I'm using MSI afterburner btw. Any suggestions, appreciated and I just might tip someone.  |
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Something wrong with your setup, gpu mining shouldnt use more than 5-10% in most cases like with me <5% cpu usage.
In windows, each GPU uses 100% of one vCPU. In Linux its more efficient. We have 4x 5830's in Ubuntu CPU is @ 60% on a Sempron. --------- But seriously, people need to stop building mining rigs.... Look at the price of BTC, its under $6 and the difficulty level went up 45% and a week ago it was at $8+. WTF. |
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Quad crossfire 5970's with a Sempron 140 and 1gb of RAM?
Are you serious?
At least put an i7 in that system. Go with Sandy Bridge even or wait for Ivy.
Total waste of money to buy an i7, UNLESS your going to use it to game. Sempron 140 is fine. I'd say get 2GB of RAM though, as when I was shopping it was like $20 for 1GB and $25 for 2GB. So if I go for minimal cost no future expansion it'll look something like this GPU: 2x 5970 ($808) MOBO: Foxconn A7DA-S 3.0 ($45) CPU: Sempron 140 ($39) PSU: Diablotek PHD ($70) RAM: 1 GB Lying Around ($0) HDD: None/USB ($0) CASE: None/Cheapassjunk (~$20) OS: Linux Ubuntu ($0) $982 for ~1.3 Ghash/s [1.324 Mhash/$] Not sure about the power consumption but it cost $0.20/kWh So if I wanna go for more GPU then I'll need more PCIe2.0x16 slots? or what other slots? The PSU and MOBO with >3 of these slots are much more expensive though I wonder if it's more cost effective to just build another similar machine. P.S 140.285714 BTC to breakeven. Can someone tell me how long it takes to get this amount of BTC I already have a 140 MHash/s so total is around 1.5 Ghash/s if I build this. And if I should continue to mine in pool and at which point should I start mining solo? Hmm Mobo doesn't support Sempon: I would recommend this http://www.newegg.com/Product/Product.aspx?Item=N82E16813130290PSU has really bad reviews: I would recommend this one http://www.newegg.com/Product/Product.aspx?Item=N82E16817152043Memory needs to be at least DDR3 1033. You probably don't have they laying around if your computer is 9 years old. http://www.newegg.com/Product/Product.aspx?Item=N82E16820148147Buying the cheapest parts invites trouble. Spend as little as possible but make sure you're buying quality parts. Yes it DOES support the sempron. I run a Sempron 140 in mine, no problems... I have that same Foxconn board. |
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Difficulty increased 45% yet we are still at $7/ USD Sell for $10 each, and profit more. It's worth more now! |
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My friend is trying to mine on his laptop (just as a test). He has a 9600M GT. We got Phoenix 1.4 installed and bitcoin. Set him up with deepbit. Made .bat file and he got an error that says: memoryloadlibrary failed loadng pyopencl\_cl.pyd I've only used ATI cards, but I assume he is missing a driver needed? Something OpenCL/CUDA related? This is the .bat file we tried: "phoenix -u http://youremailhere@email.com:passwordhere@deepbit.net:8332/ -k poclbm DEVICE=0 AGGRESSION=7 WORKSIZE=128" Please advise. Thanks! You need to install the AMDAPPSDK to get support for Stream/OpenCL. Do you have a link? Sounds strange that you need to install an AMD driver for an nVidia card... |
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Also they will draw more power than specified via the PCIe slots, so you might kill your hardware this way.
Haha... no. PCI bus limit is about 75W. These have dedicated 8 pin PCI-E connectors. -------------- The problem I see with 4 of these in a system is heat and the fact that 2000W = more than a 15A breaker will handle. I'd say your best bet would be 2 rigs. Plus if one goes down, everything isn't down. Much better for reliability. |
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My friend is trying to mine on his laptop (just as a test). He has a 9600M GT. We got Phoenix 1.4 installed and bitcoin. Set him up with deepbit. Made .bat file and he got an error that says: memoryloadlibrary failed loadng pyopencl\_cl.pyd I've only used ATI cards, but I assume he is missing a driver needed? Something OpenCL/CUDA related? This is the .bat file we tried: "phoenix -u http://youremailhere@email.com:passwordhere@deepbit.net:8332/ -k poclbm DEVICE=0 AGGRESSION=7 WORKSIZE=128" Please advise. Thanks! |
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I bought a reference VisionTek 5850 refurbished for $144 a couple weeks ago, and I have already paid it off. It is currently running at 1.20v, 1000/180, around 75 C, and getting about 360-377 MH/s. I'd say I got a good deal. Is that the one from tigerdirect? |
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290Mhash is a hell of an overclock. I have 2 cards right now running at 965/175. I'm getting 285 max. Still a very good value for your money, but don't expect 290. |
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Why doesn't someone compile a custom Ubuntu Bitcoin Mining package with all steps (or most steps at least) already done? I'm sure many people would be happy, and tip the person that makes the package. |
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Let's say you just keep buying FPGAs or GPUs until you have over 50% of the network and can dominate it.
How many millions would it cost right now?
I'm curious just how rich you'd have to be to take over bitcoin.
Could you do it with $10 million as a small business owner?
Could a hedge fund CEO do it with $100 million?
Could Zuckerberg do it with $1 billion?
Could the NSA or DOD do it with $10 billion?
How about the Chinese government?
Basically, how many people in the world have the power to fuck over bitcoin if they wanted to?
The network currently is about 2,000 Giga hashes at max. It costs about $1 per Million hashes of computer power (for decent quality parts). 1000M hashes = 1 Giga hash. You would need basically 1000, $1000 dollar computers. Total cost would be about 1 Million dollars would do the trick JUST for computer hardware. Now if you didn't already have a facility to keep the computers, I imagine that would be in 100's of thousands or even a million or two for a data center capable of running that many computers. Or one could potentially be leased. I would say the minimum upfront cost to control over 50% of the network would be around 1.5M dollars. |
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How much for a 5850 or 5830? Post the model and price. Thanks
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Whats interesting is that while Marijuana is legal in the state of California for "medicinal use," its still federally illegal!  |
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LOL. I goofed. I edited the title now.
I got 3 games with my XFX 5830. Assasigns creed is on CD. The other 2 are steam activation keys.
I sold Shogun 2 to a guy on ebay. I have 3 more copies of Shogun 2 arriving next week with 2x 5850's and 1x 5830.
yet, you didn't change your original post? its called an EDIT button, every forum has it Do you not see that I edited the title already? I'm only trying to sell Shogun 2 and Aliens vs Predators. Also, any particular reason you need to come across so condescending? |
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