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4301  Bitcoin / Bitcoin Discussion / Re: Bitcoin and the NSA on: March 19, 2012, 02:46:09 PM
i don't understand the line of thinking.  the US government could for all intents and purposes crush bitcoin with less funds, just manipulating the market and such, then with the funds required to build the computer hardware, man hour compensation, and electric consumption required to break encryption and use it in any way with enough breadth to damage bitcoin.
The line of thinking is that this hardware is targeted at AES, not SHA256, and as far as we know has nothing to do with Bitcoin at all. Not sure why OP thinks it is related.
4302  Other / Off-topic / Re: Mini-Rig from Butterflylabs on: March 19, 2012, 02:36:13 PM
I think it will. Any builder knows that a PSU really shouldn't be running at more than 80% of full load continuously, which in this case is 80% of 1500 watts (1200 watts). Assuming they stick to this, power won't be a problem.

Says who?  Rated power is rated power.  "50% rule", "80% rule" are pure nonsense.  People need to stop babying their power supply.  Run it at full power.  If it is solid (Seasonic) it will run for years at 100% load.  If it is a piece of shit well then RMA it, and break it again, and RMA it, and break it again, and RMA it, and break it again and RMA it.  Post of forums that it is a piece of shit, give it 1 egg on newegg, make a blog about how company xyz rips off customers.

Rated power is rated power.  If a PSU can't put out more than 1000W CONTINUALLY then it should be rated at 1000W not 1200W.  Consumers that baby the suppliers only subsidize substandard products.

I mean it would be like someone selling you a sports car which has a top speed of 160 mph but if you drive it faster than 80 mph it explodes and people say "dude everyone knows not to drive a sports car faster than 50% of rated speed).  It is just as foolish to hold PSU to the same low standard.

Semi offtopic rant aside, the listed spec for RigBox is ~2500W so a 50% unit would likely be ~1250W.
Very good. But my reasoning wasn't reliability, it was efficiency. The curves on most if not all PSUs go all to shit when running under 25% or over 80%.
4303  Bitcoin / Pools / Re: if you had 200 GH/s which is the most profitable pool? on: March 19, 2012, 02:28:12 PM
what kind of weird person would join a pool versus solo?
Because you can't hop when you are solo mining. You don't want the extra profits?
4304  Other / Off-topic / Re: Mini-Rig from Butterflylabs on: March 19, 2012, 02:10:57 PM
We wanted to evaluate the market and ask our fellow customers whether a Mini-Rig operating
at 25 GH/s and priced at half price (15K$) and consuming around 1.2KW would be something they
consider or not.

All suggestions/ideas/opinions are welcome.

Very interested in this. At $15k it is a much more flexible option and I suspect you would get more uptake than the $30k units.

One thing: as has been mentioned a few times here, it is important that this be able to run continuously on a 'regular' household circuit. For continuous use it must be derated to 80%. For North America, that is 15Ax120V (1800W) * 0.8 = 1440W. If it can run within that envelope, it can be run in any household.
I think it will. Any builder knows that a PSU really shouldn't be running at more than 80% of full load continuously, which in this case is 80% of 1500 watts (1200 watts). Assuming they stick to this, power won't be a problem.
4305  Bitcoin / Mining / Re: Is BFL causing the difficulty increase? on: March 19, 2012, 02:06:38 PM
Largecoin was confirmed by ttul to be s-asic, if I remember correctly.

I believe the current claim is that its a custom asic, but of course, whats in a name, a structured asic like fast path I guess is also "custom" and .. application-specific, and its an integrated circuit.. so, it wouldnt be a real lie.

s-asic always seemed the obvious way to go to me, I was even convinced thats what BFL did. Compared to fpga, it seriously lowers per unit cost with reasonable volumes, it has good potential to lower power consumption considerably and the NRE is not nearly as extreme as with a full custom design.


As I read the ttul post it pretty much says that the current offering is based on sASIC.

One day someone will build a standard cell based ASIC for Bitcoin mining, and that will cost $5-10M NRE and it will be a monster.
4306  Economy / Marketplace / Re: [ANN] Bit-Pay expands Direct Deposit to CANADA and MEXICO, lower fees for USA on: March 19, 2012, 02:02:39 PM
Splitting the funds is an excellent feature. Get your cost in USD, and your profit in BTC if you want to. Also, lower USD fees for the win.
4307  Bitcoin / Bitcoin Discussion / Re: Bitcoin and the NSA on: March 19, 2012, 01:59:44 PM
the fact that the article published a map of the facility makes it highly suspect to me.  perhaps they're playing Ben's game of perception management.
+1, or else they figured that it couldn't hurt in these days of satellite imagery.
4308  Bitcoin / Mining software (miners) / Re: Why not utilize RAM in video cards? on: March 19, 2012, 01:56:15 PM
SHA256 has been beaten to death and pulled apart until it is almost impossible to optimize any better for video cards, barring unforseen side-channel attacks. You aren't going to get any extra performance using the video card's memory for anything, in fact many people underclock the memory dramatically in order to save on power usage, while minimally impacting hash rate. Some memory is used, but not much at all.
4309  Other / Off-topic / Re: Specs on BFL Single power adapter? on: March 19, 2012, 01:49:05 PM
Hey Mr BFL man,
If we don't need the included PSU, can we get a discount? Smiley
Taking into account that PSU weighs as much as the unit itself, shipping discount should be offered as well.... I'm just saying.  Grin Roll Eyes
Lol, I suppose it does make a bit of a difference if you expect them to ship you 50 at once Grin
4310  Bitcoin / Pools / Re: Neighbourhood Pool Watch 2.2 Deepbit and 'pool hopping' on: March 19, 2012, 01:46:25 PM
Kano, can you tell me why you think Ozcoin is "in direct contrast of trust"? It's one of the few pools I have trust in, so I'd like to hear an opposing view point.
I think he just means the literal definition of a pool, as such, and therefore all pools apply. If I am wrong, I would also like to hear an answer to this. Graeme runs an excellent pool.
4311  Other / Off-topic / Re: Are NSA routinely cracking AES ?? on: March 19, 2012, 01:22:54 PM
If you’re talking about a brute-force attack on a 256-bit AES encryption algorithm then probably not but it’s possible if you have a small defined search space. The key length used determines the likelihood of a successful match. I'm sure you know with a 256 key size 2x256 permutations would yield a maximum brute-force time of 50,955,671,114,250,072,156,962,268,275,658,377,807,020,642,877,435,085 years. A specialized supercomputer that could check a billion billion (1018) AES keys per second would require about 3×1051 years to exhaust the 256-bit key space. Not likely but I suppose it's possible and luck changes the mix because you would not always need to exhaust the key space.
Farther into the article, it shows that they are targeting 128-bit and weaker versions of AES, as well as other weak algos. They are not breaking it in real time, but rather are cracking communications from 10 years or more ago, which they have collected and stored all these years until they have the tech to break in. Which it seems that they do now.

They wish to read old government communications and run analysis on them, hoping to detect patterns and such in their dealing with other nations. I have no doubt that they are targeting anyone and everyone.
4312  Bitcoin / Mining / Re: Is BFL causing the difficulty increase? on: March 19, 2012, 01:16:44 PM
ASIC's are far too big of an investment for many people to make, at least at this time, when FPGA mining is just starting to take off.

Search for LargeCoin on this forum. May or may not be legit, but it appears someone has bit the bullet already.
Asics (and to a lesser extend, s-asics) have been the prime reason I have not committed to FPGAs. At least GPUs I can resell to gamers, but its gonna be tough reselling your 80W BFL single's if asic based products really hit the market.
Largecoin was confirmed by ttul to be s-asic, if I remember correctly.
4313  Bitcoin / Mining / Re: PCI to PCI-E converter? on: March 19, 2012, 01:14:39 PM
I use one to turn a 5 card rig into 6 cards. It was finicky to get set up, but it eventually started working fine. The main thing to consider is whether it may just be cheaper to get a mobo with more pcie slots. Although the ones you linked to are a bit cheaper than I have seen elsewhere.
4314  Bitcoin / Mining / Re: Wonder who this solominer is? 88.6.216.9 on: March 19, 2012, 12:53:16 PM
Would it be possible for me to modify my bitcoind so that it would refuse to relay transactions blocks to a specified blacklist? That way, it is possible that he won't be notified of new blocks, and will start producing orphans. Same thing in reverse as well - refuse to relay his blocks, causing them to become orphan. Obviously, this would have to be more than just my nodes in order to be effective, but it is an idea that could be somewhat effective.
4315  Other / CPU/GPU Bitcoin mining hardware / Re: SSD recommendations? on: March 19, 2012, 12:46:06 PM
I've been trying to get the mushkin chronos deluxe 240gb for about 2 weeks now. Whenever I get an email that they are in stock, they are already out of stock.
That's cause they are full of awesome. I just switched 7 of our managers' computers over to them and they are loving it.
4316  Other / CPU/GPU Bitcoin mining hardware / Re: Mining rig extraordinaire - the Trenton BPX6806 18-slot PCIe backplane [PICS] on: March 19, 2012, 12:31:52 PM
Those DPS-2000BB power supplies are a nice find.
Only problem I just discovered is that they do not have their own fans. So it will be necessary to hook up some fans to them so they don't overheat and die. Also, the 2000 watt version is less efficient than the 2500 watt version, and the 2500 watt version isn't for sale anywhere that I can find.
4317  Bitcoin / Hardware / Re: The best selling FPGA board on: March 18, 2012, 09:41:33 PM
WTF? $580 for400 mhs? That's nuts!
Obviously not, since he sold out of 2 batches already. If you don't understand why it makes sense, then you don't need to worry about it and you can go on your way.
4318  Bitcoin / Mining / Re: Wonder who this solominer is? 88.6.216.9 on: March 18, 2012, 07:57:08 PM
I am figuring it is a botnet.  With botnets reaching past 1 million computers someone must have selected a group of computers with good GPU's in them.  Imagine good GPU's in 1% of machines, breaking them off as a seperate botnet.  Now run them at low levels, do not run them hard enough for fans to get aggressive or any slowdown.  10,000 machines could make 2TH ran slowly.  The internet connection usage would be kept to a minimum by only getting the bare minimum information (no transactions) and relaying back only when a block is found.  This could live under the radar on a machine for a long time if they did nothing else with the pwned machine.   And for $3000 a day, they would not have to resort to any other uses. 

Of course it could be 5000-50000 machines in play....  But this is what I think it is. 
+1. When most people think "botnet", they seem to be considering only CPU power - but it is entirely possible that the compromised machines have GPUs - and if the user from IRC is to be believed, this is indeed the case, from looking at his hardware manifest.
4319  Bitcoin / Mining / Re: Wonder who this solominer is? 88.6.216.9 on: March 18, 2012, 04:32:07 PM
One possibility is Microsoft Windows malware that targets existing Bitcoin miners and steals a portion of their winning blocks. The impact would be.
It's impossible unless this malware also provides all those miners with work too.

If the malware also provides work effectively stealing a portion of the hash rate it would still have the impact I mentioned.
Couldn't it just intercept golden nonces and discard them? That would cause bad luck, with the same/high hashrate.
4320  Other / CPU/GPU Bitcoin mining hardware / Re: apparently dead 5770 - newby casual mining fun on: March 18, 2012, 12:36:29 PM

Running at 95 degrees is easy to do on a mid range card like that, the coolers aren't sufficient to the power they have. The Rule of thumb I've chosen to live by: Don't push the cards past 80 Degrees C.

You probably killed it.

Thanks to hongus for noticing that I missed the 95C temp.

I was running it about 95 for a few days, then backed it down and it was wandering around in the low to mid 80s. But it also may have got much hotter for short periods while I was fiddling with it all.
Still that was quite interesting... and when I wasn't mining it was nice to have something that was OK for games (compared to what I'm used to). Now to keep an eye on ebay again, with my new found knowledge.



Does the system boot if you just remove the card? It is unusual for a card failure to kill the entire system. Still sounds PSU-ish to me.
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