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Showing 20 of 71 results by njloof
Hmmm, wonder how much tweaking in the code could increase efficiency. I figure you guys are already all over that though 
They seem to be doing a pretty good job of optimizing the use of the chip to maximize its throughput given the existing algorithm. ArtForz likes dropping hints about improvements to the structure of the code that they haven't found yet. He was ahead of the FPGA curve by about a year.
So how hard you guys think we can push these things? I would love to put them BFL folks in a competitive place if their hardware exists. With proper cooling, and well regulated power, whats the theoretical limit? I plan on buying one of these and water cooling it when my tax return comes this week, I will offer a bounty if someone can squeeze 500 M/hash out of these. (250 MHz each chip I believe)
You can see more in-depth conversation about trying to squeeze additional performance over at the ztex thread -- my read on it is that 200MHz may be close to the max you'll get from the LX150. There is a little noise about upping the voltage on the chips to try to get a tiny bit more performance (~4%) but it's a good way to blow the chip if you screw up.
FWIW, I have the 200MHz bitstreams now running on 4 FPGAs cooled with two of those 80mm USB fans. Granted, they are in a garage in January (~50F most of the day) but the fins and board are just barely warm to the touch.
what are your hash rates?
402.79 MH/s | 0: 7965/127/0 1.6%/0.0% | 1: 7954/97/0 1.2%/0.0% | 2d18m47s
388.65 MH/s | 0: 7821/86/0 1.1%/0.0% | 1: 7715/85/2 1.1%/0.0% | 1d23h10m
FWIW, I have the 200MHz bitstreams now running on 4 FPGAs cooled with two of those 80mm USB fans. Granted, they are in a garage in January (~50F most of the day) but the fins and board are just barely warm to the touch.
Any reason why this bitstream isn't posted on http://fpgamining.com/bitstreams/ ?
I've ordered the thermal adhesive and would like to give it a try.
I've ordered the thermal adhesive and would like to give it a try.
^^ This ^^
200MHz bitstream's been posted.
http://fpgamining.com/bitstreams/
I had two 40mm fans above each heatsink, the did not get hot, therefore I don't believe they are burnt.
Maybee something about the power supply went wrong?
Maybee something about the power supply went wrong?
That's an interesting thought. What's your power supply? What's its max amperage? Do you have a spare you can swap it with?
Yeah, 166MHz was quite stable for me using a passive cooling system I like to call "putting it in an unheated garage in winter". But 180MHz tipped the scales and produced bad data. Amazing what a <9% boost can do. Time to get one of those little cooling fans.
Okay, I think I've discovered what I think you will all agree is a serious flaw.
If anyone has read Quarantine by Greg Bear ... thats what the box reminds me of.
Don't you mean... Greg Egan?
If anyone has read Quarantine by Greg Bear ... thats what the box reminds me of.
Don't you mean... Greg Egan?
Yep, mini-B. The micro-B seems to be getting popular, but it just doesn't seem strong enough to me.
One reason manufacturers seem to favor micro-B is that the "teeth" are on the cable side of the connector, which is easily replaced by the user; mini-B has the teeth on the device side, so broken teeth require the manufacturer to repair/replace the device.
Probably not as important here unless users plan on plugging and unplugging their FPGA boards a lot.
Would be a bit nicer if it didn't use java. At least it's not TCL though.
I appreciate the portability though.
Hope this is still alive. It got very quiet in here. 
This thread maybe took some of the air out of the room:
https://bitcointalk.org/index.php?topic=40047.0
This page does a good job of spotting these sorts of opportunities. And, yes, having your accounts already funded is key to being able to grab these deals before anyone else.
http://nyse-group.de/bitcoin-arbitrage
Someone will automate this and make a small but steady income out of it.
http://nyse-group.de/bitcoin-arbitrage
Someone will automate this and make a small but steady income out of it.
Re: Official Open Source FPGA Bitcoin Miner (Smaller Devices Now Supported!)
It's interesting to see peoples hash rates with various chips and designs. It would be nice if there were a place to centrally note them for easy comparison.
... like here?
https://en.bitcoin.it/wiki/Mining_hardware_comparison
Re: Official Open Source FPGA Bitcoin Miner (Smaller Devices Now Supported!)
I made little to no modification to their code for this first commit. If you appreciate their hard work on this Open Source project, please send them your thanks and donations!
TheSeven: 14Jc8vWq1mPv7vWnP5VquZZgpLEtzW2vja
teknohog: 1HkL2iLLQe3KJuNCgKPc8ViZs83NJyyQDM
fpgaminer: 1NT4RyJMqtRuDRr6zHdXdKSpmX3SR5he6zTheSeven: 14Jc8vWq1mPv7vWnP5VquZZgpLEtzW2vja
teknohog: 1HkL2iLLQe3KJuNCgKPc8ViZs83NJyyQDM
Thanks to the three of you for your work to date! Plonk, plonk, plonk.
Re: Running for an hour, multiple times, and still 0 ACCEPTED 0 REJECTED, 0 RESULTS
There is only about 1 block published every 10 minutes on average. It is a lottery to determine who processes them and gets the 50 BTC block reward (plus transaction fees).
I entered 600000 khash/s into the Old Bitcoin Generation Calculator. At the current difficulty, you can expect:
The New Bitcion Mining Calculator assumes you are mining as part of a pool. A mining pool splits the 50 BTC block reward among participants.
If it was me, I would run solo anyway. Your 95% probability is less than a year, so I think you can expect to process a block within a year, even with difficulty increases. Of course, I plan on solo mining (in a limited way) even with an expected 50,000 days before processing a transaction.
I entered 600000 khash/s into the Old Bitcoin Generation Calculator. At the current difficulty, you can expect:
- On average, you will process one block every 47 days (assuming no difficulty increases)
- 50% probability of processing a block within 32 days.
- 95% probability of processing a block within 140 days.
The New Bitcion Mining Calculator assumes you are mining as part of a pool. A mining pool splits the 50 BTC block reward among participants.
If it was me, I would run solo anyway. Your 95% probability is less than a year, so I think you can expect to process a block within a year, even with difficulty increases. Of course, I plan on solo mining (in a limited way) even with an expected 50,000 days before processing a transaction.
He's got 2 6990's, so he's mining at double that rate (so, halve those estimates).
Everything on that screen shows your machine is working properly; you just haven't found a coin yet. Your choices are to (a) wait patiently, and be really excited when 50 BTC shows up in the next few weeks -- nothing to sniff at in today's market! -- or (b) modify the mining scripts to point at one of the many mining pools, so that you can at least see money accumulating on a daily basis.
Subscribe (don't mind me) 
Am I smoking crack or is there a "notify" button that does this same thing without the threadbump?