Still selling? Or did you make a successful sale and this is closed?

Edit: Sorry, didn't see it was you, Engman. Nevermind, I heard you've successfully sold all of yours.

I'm looking for an FPGA miner to play around with. I never got in on the fun and kept my GPUs. Since it is just to play around with, I'm looking for something on the less expensive side. That said, I'd like to play around with a unit that is capable of least 100-200MH/s and has good developer support, like the x6500s or icarus.


PM me with an offer. I'll do Bitcoin to make things easier.
Comment on here if you have advice about buying and selling for newbs or if you have additional questions.

I'd of course want to do escrow but I am new to buying and selling on here so any pointers would be hot.
If you are trusted enough on the forums, I might be willing to forgo the escrow and pay you upfront, since I have no buy/sell history. You would have to be really, really trusted though.

Edit: I'd prefer cash and in-person but I can't find anything on kijiji

Definitely not.
CPUs were general-purpose ASICs that used software to do hashing.
GPUs were the same, but were better for mining because of parallelization.
FPGAs were better because they could be programmed on the chip itself.
ASICs are the end. A Bitcoin ASIC can only do one thing: SHA256 hashing. The hardware is designed specifically to do only that. So there is nothing more to come.
ASICs are used in industry when a chip is needed to do just one thing really efficiently. Like the ASIC that does the switching in a high-performance networking switch.

Once we settle on the latest technology for ASICs, we are looking at nothing more than the improvement cycle of current CPUs. I suspect less, considering the simplicity of the units in the ASICs. Since they are so simple, I do not expect many performance increases based on changing the actual units. Just on process and materials. So something along the lines of AMD sticking with K10 for the next 10 years and just changing the process and materials and maybe using newer physical technologies as they come along, like tri-gate or finfet.
*disclaimer* - I am not a computer engineer. This is just what I think based on what I know.

How so? This could be a dangerous way of thinking, depending on your response.

My warranty experience with XFX was good. Had they not been out of replacement fans for my card at the time, they even would have sent me the fan instead of me having to send my card to them. That said, their cooling solutions are shitty, in my limited experience.
For the record, I was not aware of VisionTek's warranty, so that is something to look into.

If a malicious individual gets a hold of a single computer capable of that kind of speed, I think Bitcoin will be the least of our worries.

On a side note, I just found a bunch of interesting material that might answer all the OP's questions though I cannot say for sure since I have not read the material myself yet.
https://bitcointalk.org/index.php?topic=133425.0
http://www.cs.virginia.edu/~robins/The_Limits_of_Quantum_Computers.pdf
https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&ved=0CDoQFjAB&url=http%3A%2F%2Fwww.springer.com%2Fcda%2Fcontent%2Fdocument%2Fcda_downloaddocument%2F9783540887010-c1.pdf%3FSGWID%3D0-0-45-645102-p173864247&ei=3IdGUc-lI4muyQG554CIBA&usg=AFQjCNElz3JULn_Aa1H6NolkLNb9tbuX_g&sig2=0uHjvbW2jIBxRwMP7VIySg&bvm=bv.43828540,d.aWc

EDIT: I believe my third link has all answers.

So in summary: ESDSA would be broken and SHA256 would be fine.

I did a ctrl+f and searched for "gh/s"
I did a ctrl+f and searched for "1775"
I manually glanced at the whole page

I cannot find where it says anything like this.

Nor can I find any reference to bitcoin or mining.

I have no specific experience with the 7970 but in general I find sapphire non-reference to have really good cooling
Certain XFX video cards are the only ones where you can get a lifetime warranty.
I was personally looking at the Gigabyte OC model for a while. Apparently it runs really cool

Yeah it brings it to ~300CAD after shipping. I haven't messaged him because I can't seem to find a way to on the bitmit site.

I stand at: I don't trust him, but if it is painless to get my money back if he doesn't deliver, then I will want to try anyway.

Interesting.
I use 13.1 with cgminer on windows 8 and have no issues with my 5770.

Also, 81*C is not too hot for a video card on load. Although the long-term damage will be greater with greater heat, this is still cool. I personally start to worry as I approach 90*C. The cards usually throttle to protect themselves around 100+*C. A lot of 4870s that regularly ran over 90*C experienced electromigration issues a few years later.
I recommend GPU-Z to monitor your temps. I have to watch my 6950 doesn't go above 102.5*C or it will start to throttle. I wouldn't recommend that temperature for anyone. The only reason I am fine with it is because of XFX's warranty. I've already had to get them to replace the fan once.  So another bit of advice is to not run your fan regularly above 80-90% to avoid the heavy wear causing it to break.

So much better thanks

FYI, you can fetch the balance for the addresses with =ImportData("http://blockexplorer.com/q/addressbalance/"&D3) but unfortunately, it isn't practical as google limits the number of external references per spreadsheet to 50

You can also drag down the striped line just above the "1" label to prevent the headers from scrolling when you scroll down the list.

Ok so I am doing some testing on my Nexus 4 (quad, 1.5GHz). Maybe from it we can see what your issues might be or give some help.

Note that neon is an instruction set on most ARM processors. It is mainly used for media processing, such as mp3 decoding. Most notably, Nvidia chose to remove the feature from their otherwise stock ARM Cortex A9 Tegra 2 chip.

I checked the deep sleep info using CPU Spy.

App: Litecoin miner --> 0.09Kh/s (per core? output isn't clear on info)
Analysis: At this speed, you would have to wait a while to see results as it might be a while before a single share is even accepted. The Miner can't prevent deep sleep with the screen off
Bugs: Mining continues but the interface resets and doesn't provide output if you rotate the screen.
Notes: Appears to be a black themed clone of AndLTC but without neon support. I really hope this developer is more interested in keeping up with development.

App: AndLTC --> ~7.5Kh/s using neon, ~4.3Kh/s without neon
Analysis: I used to use this one on and off. It had cpu core detection issues on some of my phones.
Bugs: Mining stops if you rotate the screen. My phone went into deep sleep when I turned off the screen. console output doesn't autoscroll.
Notes: Developer appears uninterested in updating the app or fixing the issues. Purchase of pay for version not recommended.

App: LTCMiner --> 0.11Kh/s
Analysis: good interface
Bugs: Do not go to the news tab EVER, it will get stuck in a crash loop. It doesn't show hashrate when in "run in background" mode. This one also fails to keep the phone out of deep sleep with the screen off.
Notes: Enable "run in background" if you want to mine without being inside the app

I wonder if there is simply no way to prevent deep sleep with the screen off in android? Which is kinda too bad as you have to watch your idle settings and make sure it doesn't screen-off when idle and plugged in.

Mining on your phone is slow. Pools estimate your hashrate based on your submitted shares. How long did you wait for?
I have a unit at ~ 130Kh/s going that submits a share once every second.
Going by that, LTCminer should submit once every 10-20 seconds. I will report back to you if I find I have the same issue. I used to mine with it on litecoinpool.org and had no issues though. I am using notroll.in now, however. Anyway, I will edit this post to save space so watch for it.

EDIT: maybe it takes longer than I thought. I've been running my desktop Phenom IIx6 on one core at 6.44Kh/s for 6 hours. My shares submitted to notroll.in are 50. This just so happens to be the same speed of the total of all 4 cpu cores on my nexus 4 when it throttles to 1.1GHz after a while. It has been running for less than 30 minutes and has yet to submit a share.

UPDATE: since this post was first made until the edit date listed at the bottom, my nexus 4 has submitted 5 shares and my phenom II single core has submitted 7 shares. So that is how long you should wait to see reflected results. Do not expect accurate estimates at such low speeds. For example, my phenom II on notroll.in is showing 3.5Kh/s and my phone is showing 0Kh/s. This is because they base the estimate on share submissions. If your submissions are too slow, the speed will not be accurately reflected.

https://www.bitmit.net/en/item/19659-x6500-bitcoin-miners-working-100-400mh-s-for-less-than-20w

So this is the last guy on bitmit selling an x6500 and willing to ship to Canada. He has no feedback but does escrow, so there shouldn't be a problem, right? Thoughts?

Does anyone have any alternative ideas?

I am interested in purchasing a spartan 6 based FPGA as inexpensively as possible. I don't expect to make money back.
I started mining after the summer of 2011 with GPUs and never got into FPGAs. I did dabble with CPUs though. I'm just interested in getting an FPGA and running it because I don't want to have missed some experience with a generation of Bitcoin hardware, now that I am a more dedicated miner. I enjoy the whole hardware mining process.

So if anyone has any feedback and thinks this guy is worth a shot or if anyone on the forums is willing to sell me an FPGA like icarus or an x6500, please let me know. I'm not looking to spend huge so I am hoping for a board with only one or two chips. Hopefully for less than 4BTC but that might be optimistic.

Managed to get the time to try out 2.11.2 and that seems to have solved my problems. I've had weird issues like this before with cgminer. Like one version I used to use supported stratum but it never worked so I updated to a slightly newer version and it did.

Anyway, it has only accepted 3 times so far and the pool is reporting 10Kh/s so I will run this overnight and report back but for now I am marking it as solved.

EDIT: nevermind. I just got lucky. Been running it some more and the output is mostly filled with "stratum from pool 0 detected new block"
I suppose this is a new message than what 2.11.0 was giving me but the results are the same, occasional accepted share but mostly nothing. My 6770m, on the other hand, is getting accepted messages every couple seconds. My next experiment will be to try a third pool, litecoinpool.org and see what results I get.

EDIT, EDIT: ok so litecoinpool.org seemed to work fine for the short time I tried it, although accepteds aren't appearing as often as my slower 6770m. The only difference appears to be that litecoinpool.org doesn't use stratum so I am therefore led to believe that I am simply being too impatient and that perhaps 2.11.2 did fix all my issues. I would like to ask for some feedback on this thought but I will also go ahead and do my overnight testing as I originally intended and re-label this thread as solved if all goes well.

We need more details. You are not providing enough information about your issue, such as the app, the pool, the outputs, any errors, etc.

General troubleshooting:
are you signed up the pool?
do you have the pool input properly?
did you hit start mining or similar?
was there any output indicating errors or successful hashing?

Why do you assume the CIA will control a quantum computer initially, assuming it is invented and practically usable?

Neither is every public private keypair in the world, by your logic. So don't do online banking. Or shop online. Or do credit card transactions.
Bitcoin is not the only thing not safe from the concept.

Um, no?
Your examples seem to be arguing against something else other than what I have said.

What I disagree with is the idea that Bitcoin will be valued directly based on its security more because "the hashrate is higher". It has proven to be secure and continues to do so. If it was proven insecure before but then goes on to be proven secure for a year, that would be a different story. I am arguing against the idea that a massive increase in hashpower will directly increase the value of a Bitcoin.
Changing your public/ private keys on your bank's website from 2048 to 8192 is not going to get more customers.

Never, ever did I say if Bitcoin were to lose its prowess in security would it then continue to be successful.

If Bitcoin's security is proven ineffective --> price will drop significantly.
If Bitcoin suffers no security issues        --> price may go up due to other factors
If Bitcoin hashrate increases                 --> price will not go up because of this.

In the second underline, you are forgetting about supply and demand, which is a significant factor in Bitcoin specifically due to the few and growing users and the fixed supply. A simple news article can cause large changes in price that would not be true for USD.

Like your art and sense of humour. Keep drawing.

First, define significantly.

Someone correct me if I am wrong, but as I understand it, the client will choose the coins with the least required transaction fees to send first if you were to try to spend that some amount after receiving the deposit. So there should be no worries.