I am very interested in these couple of Aussie group buys but unfortunately with the new hardware announcement due in under a week (10th) and that you havent had order response from friedcat I will have to pass this time. If you are not getting a response I can only assume this means that as per his posts on other threads that this means there indeed is no stock available right now. Also a suggestion for another BTC trading company I have used with success was Coinjar, specifically their 'Coinjar filler' service. They accept cash deposits at several of the major banks (Commonwealth bank is their bank, use that for fastest transfer) but one problem is that for the first deposit it cannot exceed $100 AUD, but 7 days after the first deposit they increase this limit to $500. Their fee is 2% which is better than 5.9% on your suggestion and also the turn around time if deposited at a commonwealth bank seems to be usually 1 hour (it was for me too). It's also more or less anonymous as the bank didn't take any of my details, which some buyers might prefer instead of associating themselves with trading BTC as you will do if you buy BTC with a transfer from your bank account (look at what happened with technocash etc). You do have to confirm a mobile number via sms with Coinjar though. I will monitor this thread because I will probably order some if you or one of the other Aussie group buy organisers can secure an order. |
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southerngentuk makes a good point that people are unlikely to send you BTC with no assurance or evidence you can even get the hardware to begin with.
A group buy in Aus would be great though it cost me 1 BTC in shipping alone to get some from the USA. USA<->AUS postal services are ludicrously expensive.
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I'd love to see some opinions on ZenithCoin. From what I've seen it doesn't have many improvements over bitcoin but as a privacy advocate I love that it mixes the blockchain by default  14 pages enough? |
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Hold up I think I confused you with the intensities. In my experience bitcoin and the SHA-256 altcoins need low intensity (much less than 10, as I said mine are around 4 or 5) but with scrypt (litecoin and so on) you need to use much more than 10, probably up near 15. You need to test these yourself eg start at say 10 then do 11 then 12. Write yourself a table on a notepad comparing the performance at each step. From the SCRYPT-README.TXT file in cgminer: Just like in bitcoin mining, scrypt mining takes an intensity, however the
scale goes from 0 to 20 to mimic the "Aggression" used in mtrlt's reaper. The
reason this is crucial is that too high an intensity can actually be
disastrous with scrypt because it CAN run out of ram. High intensities
start writing over the same ram and it is highly dependent on the GPU, but they
can start actually DECREASING your hashrate, or even worse, start producing
garbage with HW errors skyrocketing. Note that if you do NOT specify an
intensity, cgminer uses dynamic mode which is designed to minimise the harm
to a running desktop and performance WILL be poor. The lower limit to intensity
with scrypt is usually 8 and cgminer will prevent it going too low.
SUMMARY: Setting this for reasonable hashrates is mandatory. And also entirely relevant to your interests: ---
TUNING AN AMD RADEON 7970
Example tuning a 7970 for Scrypt mining:
On linux run this command:
export GPU_MAX_ALLOC_PERCENT=100
or on windows this:
setx GPU_MAX_ALLOC_PERCENT 100
in the same console/bash/dos prompt/bat file/whatever you want to call it,
before running cgminer.
First, find the highest thread concurrency that you can start it at. They should
all start at 8192 but some will go up to 3 times that. Don't go too high on the
intensity while testing and don't change gpu threads. If you cannot go above
8192, don't fret as you can still get a high hashrate.
Delete any .bin files so you're starting from scratch and see what bins get
generated.
First try without any thread concurrency or even shaders, as cgminer will try to
find an optimal value
cgminer -I 13
If that starts mining, see what bin was generated, it is likely the largest
meaningful TC you can set.
Starting it on mine I get:
scrypt130302Tahitiglg2tc22392w64l8.bin
See tc22392 that's telling you what thread concurrency it was. It should start
without TC parameters, but you never know. So if it doesn't, start with
--thread-concurrency 8192 and add 2048 to it at a time till you find the highest
value it will start successfully at.
Then start overclocking the eyeballs off your memory, as 7970s are exquisitely
sensitive to memory speed and amazingly overclockable but please make sure it
keeps adequately cooled with --auto-fan! Do it while it's running from the GPU
menu. Go up by 25 at a time every 30 seconds or so until your GPU crashes. Then
reboot and start it 25 lower as a rough start. Mine runs stable at 1900 memory
without overvolting. Overvolting is the only thing that can actually damage your
GPU so I wouldn't recommend it at all.
Then once you find the maximum memory clock speed, you need to find the sweet
spot engine clock speed that matches it. It's a fine line where one more MHz
will make the hashrate drop by 20%. It's somewhere in the .57 - 0.6 ratio range.
Start your engine clock speed at half your memory clock speed and then increase
it by 5 at a time. The hashrate should climb a little each rise in engine speed
and then suddenly drop above a certain value. Decrease it by 1 then until you
find it climbs dramatically. If your engine clock speed cannot get that high
without crashing the GPU, you will have to use a lower memclock.
Then, and only then, bother trying to increase intensity further.
My final settings were:
--gpu-engine 1141 --gpu-memclock 1875 -I 20
for a hashrate of 745kH.
Note I did not bother setting a thread concurrency. Once you have the magic
endpoint, look at what tc was chosen by the bin file generated and then hard
code that in next time (eg --thread-concurrency 22392) as slight changes in
thread concurrency will happen every time if you don't specify one, and the tc
to clock ratios are critical!
Good luck, and if this doesn't work for you, well same old magic discussion
applies, I cannot debug every hardware combo out there.
Your numbers will be your numbers depending on your hardware combination and OS,
so don't expect to get exactly the same results!
If you decide to declare a value for thread concurrences (instead of just declaring shaders) but run into problems with really high values, you might find that for your card you require "setx GPU_MAX_ALLOC_PERCENT 100" that you'd normally have in your batch file, you can still use the config file if you add GPU_MAX_ALLOC_PERCENT 100 as a windows environment variable. Right click on my computer -> Properties -> Advanced system settings -> Environment variables -> In the "User variables for (username)" click New and then add GPU_MAX_ALLOC_PERCENT and set the value to 100 It might vary from OS to OS but generally you should be able to find it in advanced system settings. |
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Thus, with probability 19.53 %, you'll earn 100 BTC (within a few percent of earnings when mining in a pool); with probability 44.14 %, you'll earn 75 BTC or less; with probability 36.33 %, you'll earn 125 BTC or more.
I'd take those odds. But now plug OP's 1.4GHash into your spreadsheet and see how poor it looks. The problem with this thread is that we've got OP with next to no hashing power (on SHA-256 at least) at 1.4 GH/s and then we've got a guy with two Avalon rigs which is the complete opposite case. |
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OP can you download cgminer and then just run the .exe and follow the prompts to add a pool URL and worker details and see what devices it finds? It's possible it will give you the same error as guiminer but it's worth a shot.
If that doesn't work I think you might actually have some kind of a problem with your AMD driver install or perhaps your BIOS is not up to date. 3 things you can look into!
Also I have been making these comments under the assumption that you are running the cards at their stock settings (core/mem frequency and voltage) be sure to revert to stock if you've been changing them.
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I wonder, if you go 'add my order' and change its status, will it overwrite whatever is on that page? Seems like it would be open to abuse though if that was the case. Perhaps it requires the site admins approval?
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You definitely don't want to take the word of just one thread without trying it for yourself. It only takes a few minutes to test some different intensity values and the difference for scrypt mining is substantial. For bitcoin and the other SHA-256 coins it is - in my experience - less important, but low values will still give you terrible MH/s.
I don't know where you got intensity 9 from, all my GPU's hashing SHA-256 run optimally at 5, the display device runs at 4 so I can use the PC.
I'd suggest you spend some time testing it out.
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I think 51% can be done quite easy for the U.S. government: they need special squads/agents to take over of 2 or 3 biggest mining pools. This can be done even if pools are operated outside of the U.S., and even can be done remotely. But i guess, to have more confidence they would need to send special people to pool operators (-; Hell, at the moment we cannot be sure that some of the pools are already in control of governments....
This would only work for as long as the pool miners continued to run their workers. As soon as word of the takeover got around, miners would stop using these pools and Bitcoin could get back to normal operations. But the US does have some serious supercomputing hardware at its disposal. I wouldn't be surprised if they could take over Bitcoin quite easily at any moment. -Michael necro  The sum total hashing power of every supercomputer in the world is much less than the total hashrate of bitcoin. Supercomputer almost always run computations that are rely heavily on CPU, memory, and I/O resources, but these are not suitable or optimal for mining bitcoins at all. Not only was this case true just with GPU miners contributing to the bitcoin network hashrate, but now that we have ASICs... Most supercomputers are built for performing general computing tasks that require huge resources because of their inherent complexity. The processors must be able to perform a extremely wide range of operations. But in bitcoin this is completely not the case... we need high speed hashing of SHA-256 algorithm... ie. the same few operations over and over as fast as possible and running in parallel as many times as the hardware allows for. The hardware in each case are almost like polar opposites. |
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Have you installed the latest AMD drivers? Are they both plugged into monitors? For Windows to recognize them they both need to be plugged in, or have "dummy plugs".
I keep hearing this over and over and over again, but in a simple setup like this it is no longer required since a long passed driver update, I don't recall the exact revision but I think it was pre-12.1 There is nothing plugged into 2 of the 3 graphics cards in my system and I operate cgminer just fiiiine. 6870 --> two duplicated DVI->HDMI outputs 5970 nothing connected 5750 nothing connected *sometimes a HDMI to my TV for when my esteemed motherboard decides this card should randomly be the primary display device while showing the boot process 
OP, can you see both cards if you load something like GPU-Z ?? |
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You seem to think that people don't have a choice where they exchange their cryptocoins? If there is a problem with an exchange or operator, then they will have less customers, they will make less income from taking less fees, and sooner or later their costs of running their operation will be too high and they will cease to exist. There are at least 3 other reasonably sized exchanges that are good for exchanging btc right now, if you have a problem with mt.gox then don't use them. No one has to hold them accountable.
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OP should be careful if he is say, renting, and the landlord/owner is paying for the electricity. If they see a huge spike after someone moves in, or out of the blue, then you can expect them to investigate and they're probably smart enough to figure who is using so much power. And then oh look, renters in that building must pay electricity themselves now. You would not be the first miner to get stung by this!
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And leave a sticky residue all over the place? Good luck selling a GPU with glue all over the plastic shroud. Doesn't affect performance, but nobody's going to touch that.
Methylated spirits. $2-3 at your nearest grocery store. |
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zackclark70 - When I clicked on the link you provided right about it I found this.
~ 700 KH/s | Radeon 5970:
"cgminer.exe --scrypt -o [URL ]-u [workername] -p [password] --intensity 18 --worksize 256 --shaders 3200 --thread-concurrency 8192 --gpu-fan 75"
~ 720 KH/s | Radeon 7970:
"cgminer.exe --scrypt -o [URL ]-u [workername] -p [password] -s 2 --expiry 1 --queue 0 --thread-concurrency 24576 -I 13 -w 256 -g 2"
Works for every srcypt coin, like PXC.
What I don't understand is I see some people using config files and other people using a bat file with commands I do not understand. I don't understand what the above .bat file is doing that would be so different from just using cgminer with the default settings. What I need is an already optimized config file that will work with two 7970's clocked at 1000Mhz core and 1425Mhz memory. Then I need to know if I can just copy and past the optimized config file right into my config file and add my mining credentials and start mining? Also, I see everyone says to create a .bat file but everyone tells me to put something different in that .bat file. That is another thing that is really confusing the heck out of me.
PS. I copied the above for the 7970 into my .bat file and I am only getting 35Kh/s. I don't understand this at all.
Choose to use the config file or the bat file, and stick with it. My understanding is that they can basically achieve all the same things. I personally use the config file because I run 4 different GPU's in my rig so it looks outrageous if I try to use batch files. I'd suggest having a look at the readme file in the cgminer folder if you havent already. You can observe the formatting of the config file for each arguement. You should not really just copy and paste another persons entire config file because it will likely not be compatible, it only takes a single wrong character, a missing space / dash / " etc to make the whole thing fail to load. It's much better to compare the two config files, find what is different, and then make changes specifically to the arguments in your config file. "cgminer.exe --scrypt -o [URL ]-u [workername] -p [password] --intensity 18 --worksize 256 --shaders 3200 --thread-concurrency 8192 --gpu-fan 75" Some say that you should not declare both thread concurrency AND shaders. Usually just do shaders. and I am only getting 35Kh/s. I don't understand this at all. Do you mean that you have a config file and now started to use batch file as well? Try removing the config file from the folder and running the batch file again. |
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Download CPU-Z (> C<PU-Z). Look at Mainboard tab to find out what your mainboard really is. If it doesn't know, then look carefully on the board for the manufacturers part number and google it. Visit that vendors product page and download the newest drivers. I have a suspicion that your problems all started when you removed some chipset drivers or something equally as important. Keep in mind that a mainboards chipset is what controls the operation of the PCI-e slots. Do a fresh windows install and then install the mainboard drivers. Then install the AMD graphics drivers. I would suggest maybe not using the beta as it just another place something can go wrong. 12.8 seems to be a pretty well regarded version. |
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If your current meter on the wall is showing 5A then your only burning 550 W. Your not close to 1000W. Your power supply is fine, just like you read in your research.
Are you sure that the region voltage and frequency are the same in your comparison there? |
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that would be great! you should invest on asic miners or butterfly labs. it can save you alot of money!
I would stay away from BFL until they catch up with their current orders. They are shipping orders paid for from last summer. It might be a while before they catch up. Here is a nice list of ASIC miners: http://decentralizedhashing.com/bitcoin-mining-equipment-table/Note: I'm in no way affiliated with any ASIC mining company or the above website. looks at username...  |
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He, others and I, would not need to put any more stress on the mining gpu's. So, all your basic work is loaded on the IGP rather putting any more stress on the mining gpu's. Also, you could ramp up the intensity without any desktop lag interference because, well, the IGP takes care of all the desktop work, like browsing ect. You might find a slight lag, but nothing like the lag as if you ran the mining gpu as a miner and desktop usage < that is horrible, You would need to run intensity 13 or something low, which sucks, otherwise with high intensity, you will not be able to do anything on your desktop. And have you tried this method, of this topic before? If so, I'd say you have a say so in it, if not, then why answer something you "think" "but really it's not going to make a huge difference." It's all of the world difference for users that use their mining rigs as a regular day usage PC.  Title really answers your why question, but above is a deeper explanation. Looking back on this thread, OP stopped responding when the thread was 1 day old and seemingly without a solution to the problem. This thread has been necro'd 3-4 times by different users over the last 3 months since then. I was simply offering another point of view to the discussion, that perhaps people were going about a huge amount of effort for little gain (a few dozen khash/s if that). For example, I believe that every persons time has a price attached to it, unless they are too young to work, a non-working student, retired, or otherwise unable to turn an income. I assume that at some stage OP would have spent so much time playing around with this problem that he/she could've just picked up an extra shift at work or two and then purchased the next card up in the series, ran the PC without IGP, with a slightly lower intensity on one card, and still had been better off. Perhaps I just have a strange way of looking at things... |
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Because if customers / traders knew that they were 'crooks' then they'd use something else and the exchange would see nil use.
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