The person hopes that the future ratio of how much money they can earn with a given hash power will be more favourable, so they enter a long-term contract.
The person wants to increase the hashrate of a mining pool they own, whether for test purposes or to attract more people with a high hashrate.
The person holds some other cryptocoins and wishes for their ...
Litecoin mining is currently more profitable for likely all GPUs.
From the bitcoin and litecoin hardware wikis, you'd get 300-400MH/s for bitcoin mining and 340-470kH/s for litecoin mining if you set it up properly (and there is something VERY fishy about you getting 250MH/s with your CPU, I'd guess it is using your GPU though you don't know it...).
I think you misunderstand the problem. The reason mining is becoming impractical is because there's too much of it. It's like a restaurant that's too crowded. It means you can't get a table, but the restaurant is not going to go out of business.
In many ways, it is just coincidental that GPUs are going at hashing. It doesn't surprise me that some GPU engines are a better fit than others. A particular GPU might be very good at some types of mathematical operations (or rendering, for that matter) but might not be particularly good for hashing.
This is discussed in some detail on the bitcoin.it wiki:
Here are some guidelines to choosing hardware for an effective GPU rig.
CPU: The cheapest you can find. Low-end AMD CPUs are good for this.
RAM: The cheapest you can find.
ODD: Unnecessary, install the OS from a USB flash drive.
HDD: Unnecessary, use a USB flash drive, the cheapest you can find which can hold the OS.
GPU: Basically any ATI series 5XXX+ ...
Heavy usage will certainly decrease the lifetime, but I think it's not incredibly much as long as it's not overclocked. You will probably even buy a new card (because the current becomes too outdated/slow) before the current one breaks down.
Keep an eye on the temperature for a few hours (or as long as it's not stable/maxed out), it shouldn't exceed about ...
Vanity mining for example over at my Vanity Pool. Thanks to split-key vanity addresses anyone can request a vanity address without compromising their security, set their own bounty, and anyone with a mining GPU can try solving the work and claiming the bounty.
Apparently I do not have enough points yet to give your answer a vote, but your solution also worked for me! Adding -T to the command line command did the trick. Not only do I now get a neat output of what is happening; the -T parameter also made the entire mining process actually work!
Before adding the -T command:
Screen flashed with the "Started CGMiner ...
you could mine litecoins; the advantage of having a GPU over a CPU is not as pronouced as with bitcoin but it could still be profitable. you may have to run those numbers though. ltc-charts.com for exchange rates.
You can try to "auto-manually" add your GPUs to bfgminer by pressing M then + and then typing auto, or you can use the -S opencl:auto option when launching bfgminer.
NOTE: Not all graphics cards are compatible; various software is required (e.g., AMD APP sdk); it is not recommended to use GPUs for bitcoin mining with bfgminer.
According to README.GPU, the ...
No, these two terms are completely unrelated.
Bitcoin block is a record of some or all of the most recent Bitcoin transactions that have not yet been recorded in any prior blocks.
GPU block is just an unit of organization of threads running in parallel. The threads running on GPU are organized in blocks, and threads belonging to same block have effective ...
Your best bet with a GPU is to mine scrypt coins. If you want the resulting payout to be in bitcoin, try using mining on a multi-pool like middlecoin.com. That pool automatically chooses the most profitable scrypt-based coin to mine and pays out daily in bitcoin.
I have 4 7950s pointing at middlecoin and make between .05 to .1 bitcoin per day.
There is a program called CudaMiner that can be compiled to run on Linux.
I've also written some more notes about compiling CudaMiner here
I get the same error using OS X 10.9 MBPR.
Even though I followed http://atomton.roon.io/compiling-cudaminer-on-os-x-10-9 exactly.
UPDATE: PROBLEM SOLVED.
in both scrypt-jane.cpp
First the bad news: your Motherboard appears not to have a PCI-E Slot, which is required to fit any modern GPU. On the other hand for the price of a single GPU you can order more than 1 ASIC miner with lower power consumption, i.e., cheaper to run, and more computational power.
I'd wait until the first ones actually ship, though.
Nothing in the litecoin protocol changed, only a tool to mine litecoins using GPU was independently developed: the Reaper and caused difficulty to improve to make CPU mining much less efficient (compared to electricity price). Still, the rise of diffculty is not so dramatic as was the case for bitcoin and scrypt algorithm has proved its worth. CPUs can still ...
Realistically, it's a multiplier of the two. You can make up for a slower clock with more cores and vice versa, but the number of hashes per second is dependent on both.
Sadly, I'm not aware of any specific formula to approximate hashes per second for a given clock speed and number of cores.
It's important to note, by the way, that the one thing that won't ...
Currently the hash rate is around 25 TH/sec. It is expected that when the ASIC hit the market in Dec 2012, the new hash rate will be about 250 TH/sec. The difficulty is directly proportional to the hash rate, so it should also increase 10x. This would reduce the profitability of existing GPU miners by 10x. Plus about the same time the block reward will ...
2) Password cracking.
3) Supporting a specific mining pool / alternative blockchain currency.
4) Betting on the difficulty decreasing (relatively to the exchange rate), and securing a long-term contract which will be profitable in that contingency.
The rather new WebCL technology enables this, unfortunately WebCL is not directly supported by browsers yet.
See http://www.coined.com/ and http://webcl.nokiaresearch.com/jsoclbm/ for examples of such miners. I expect more will follow in the coming months.
You can try running different software for mining after restoring the overclock settings back to factory settings. This way if the graphic card fails, you know the problem exists regardless of the mining software and the overclocking.
There are two main reasons:
1) The person wants to build the hash rate for an alternative currency or mining pool in which they have a financial interest. You can't get a mining pool or alternate currency going without hashing power.
2) The person wants to mine something other than Bitcoins, typically a currency that isn't yet available on any exchange. So ...
Bitcoin mining is principally an integer maths task, not a graphics task. It just so happens that the hundreds of processors found on modern graphics cards can sometimes be suitable for parallel calculation of the bitcoin task, at upwards of a hundred times the best available rate from four cpu calculations.
See wiki reports on bitcoin hardware for ...