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...).
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 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 ...
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
The second link is dead already, but a similar tutorial is detailed in this thread:
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
I think the important factors for scrypt in OpenCL are as follows
GPU core clock rate
Memory clock rate / memory bandwidth
Memory bus width / channel
You can check out in Programming Guide of AMD Accelerated Parallel Processing.
single or double precision of floating number does not matter. Either SHA-256 or scrypt is ...
You shoud instead use cudaminer for this. I use the same card and I have a mining rate of 150khash.
The reason why you get a low mining rate is because Nvidia cards use CUDA cores to do most of their calculation and most of the miners do not use them since the best graphic cards for mining are AMD cards (and they do not have CUDA cores).
I dont know where ...
In my opinion trading BTC has a higher potential of profit when compared to mining because of the sheer difficulty.
If you do decide to go for an ASIC.
I would recommend Coin Terra GoldStrike1 2TH/s ASIC miners.They are expensive at 6,000 USD.But their Break Even time on January Batch is 4 Days.If they deliver through this is the only miner I feel could ...
For Litecoin, if memory size is increased in processing the Scrypt
algorithm, for example to 384 kB instead of 128 kB (...), would the typical CPU
architecture (...) be likely to see a corresponding increase
No, it works the opposite. If you increase memory, which is used by the scrypt to generate a single hash, the time it takes to ...
Mining on a cpu at all is a bad idea, it can and will wear the cpu down, and is ridiculously slow compared to a gpu. Also mining with an Nvidia card isn't the smartest thing either as they are much slower than AMD cards. Regardless you will make next to no money mining with this kind of hardware given that there are thousands of people with ASIC miners that ...
No, neither CPUs nor GPUs of any kind are of the slightest use in Bitcoin mining. This has been the case for several years, since the introduction of ASIC miners which are now many orders of magnitude more efficient.
See In the ASIC-age, is it worth starting mining Bitcoin at home?
The market has progressed to ASIC miners, which are better adapted to the singular task of mining. ASICs generate much greater hash-rates and are much more energy efficient at the same time.
With the advent of ASIC miners the difficulty has been growing immensely: Since the review you linked was published in April the network's total hash-rate has grown 40-...
I started around March with 2 GPU's. My electricity is free and bitcoin price has tripled since then. I still haven't come close breakeven.
Back then I knew it would take a long time, and I knew the ASICs were coming. I did it purely out of interest and fun.
There really is no other reason to start GPU mining now. Even with everything free, it's just wear ...
You need to use cgminer-3.7.2 or earlier. For some reason, GPU mining was removed from subsequent versions.
Cgminer is the best available miner for your purposes. Con Kolivas is one of the world's great programmers, and we are lucky to be able to use his software.
Please also be sure to read the file SCRYPT-README to get reasonable performance.
to maps gpus i use this script:
cgminer -n option
Timeout /t 3600
Make it a .bat file and put it in the same folder as you cgminer, then you can tell witch gpu that is 0,1,2...
but you have to turn off power saving in windows to prevent you 280x form sleep, if you don't have a dummy-plug or an screen put to that device.
I used this guide for all start ...
In my experience, every time I've bought a miner, by the time I received it, if I had just spent my money buying BTC, I would have made a bigger profit. That being said, I'm a bit of a nerd so I look at mining as a hobby and if I can get my money back eventually (always have) while having fun nerding-out, I look at that as a win.
Nowadays, there are custom miners for Bitcoin. These use customised hardware (ASICs) and thus GPU mining is not profitable. However, this custom hardware does not exist for Litecoin and most other altcoins (based on scrypt). Thus, you might still be able to make money GPU mining Litecoin this way.
Unless you have customised hardware, forget about Bitcoin ...
CGMiner has removed GPU support, but BFGMiner has not. You can use an older version of CGMiner (i.e., v3.7.2) or GUIMiner or RPCMiner.A GPU is still useful for mining alternate coins such as litecoin, especially if you have a high-end AMD card.
The hardware of the controller doesn't matter. You can run cgminer on a Raspberry Pi or a TP-Link router, both are terribly weak and it has absolutely no effect on the ASIC whatsoever. To this end, even KNC mining rigs use Beaglebone Black boards to control their top of the range miners. Most home miners use Raspberry Pi due to their low cost and easy to run ...
Have you tried the command -d 0,1, then setting your Thread Concurrency and Looup-gap and worksize for each device accordingly.
You need to tell CGMiner you have two GPUs and set the thread concurrency for them. For this, try a command like this: ./cgminer --scrypt -o stratum+tcp://my.pool.ip:xxxx -u myusername -p mypassword -d 0,1 -I 18,19 -g 1 -w 256 --...