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1601  Bitcoin / Mining support / Re: iMac with 6750M on: July 16, 2011, 06:02:36 AM
I don't know many people that mine with an iMac. And I have heard people burning out their cards. Don't know how hot their cards are though. I have an iMac with a 5750. I was getting 77 mhash/s. Once I heard the story of someone's iMac dying, I stopped mining on mine. Not worth it... so I just got a dedicated miner.
1602  Bitcoin / Mining support / Re: iMac with 6750M on: July 16, 2011, 05:52:34 AM
From what I know it's a bad idea to mine with an iMac. And iMac does not have good ventilation and you can burn out your card that way. I've heard people doing that. Plus, you are likely just getting <100 Mhash/s, right? Not worth it.
1603  Bitcoin / Pools / Re: do you want to know "Who find the bitcoin blocks"? on: July 15, 2011, 10:59:43 PM
Here's one that Artefact2 (from Eligius pool) created: http://pident.artefact2.com/
1604  Bitcoin / Pools / Re: [~275 GH/s] BitClockers.com - Monthly Contests/No Invalids/InstaPay/Live Support on: July 15, 2011, 10:56:55 PM
you site has been included in this site

who find the bitcoin blocks?

http://digbtc.com


Doesn't look like you are including bitclockers. Might be because bitclockers doesn't expose the block ids. Why is that? Why doesn't bitclockers show the block ids here? http://bitclockers.com/blockhistory
1605  Bitcoin / Pools / Re: [430 GH/s] Eligius pool: ~0Fee SMPPS, no reg, RollNtime, SQL, hop OK, 8decimals on: July 15, 2011, 10:35:06 PM
Artefact2 already has something like it: http://pident.artefact2.com/
1606  Other / Beginners & Help / Re: A website to check "Who find the bitcoin blocks" on: July 15, 2011, 10:34:23 PM
Here's one that Artefact2 (from Eligius pool) created: http://pident.artefact2.com/
1607  Bitcoin / Mining support / Re: Under clock memory in Linux for 6970 up to core clk minus 125Mhz. on: July 15, 2011, 10:06:11 PM
Yes this is a good question.  As far as I know there is no Linux tool to underclock lower than 125 below core clock.

Windows users report MSI Afterburnder will allow this.

(1) Can anyone confirm the real world value of this under Windows?  Are you seeing lower temps?
(2) Are there any other windows tools which can do this for Cayman core?

If its worthwhile, and if I can figure out how MSI interacts with the card, I'd like to try to modify the linux tool- since AMDOverDrvCtrl is open source and all.

Yeah, if there is a way, that would be awesome.
Take a look at atitweak: http://forum.bitcoin.org/index.php?topic=25750.0
That is based on AMDOverDrvCtrl. Unfortunately, like AMDOverDrvCtrl, it will let you set a lower clock speed, but it doesn't stick if it's more than 125 less than core.
1608  Bitcoin / Mining support / Re: Under clock memory in Linux for 6970 up to core clk minus 125Mhz. on: July 15, 2011, 06:17:52 PM
If anyone knows a workaround to underclock memory clock more than 125MHz below core clock, please post. Thanks!
1609  Bitcoin / Bitcoin Discussion / What if deepbit started a new block chain? on: July 15, 2011, 04:41:44 AM
Imagine if tycho decided he wants to start a new block chain and uses deepbit's huge hashrate to do that. Or if a hacker hacked into deepbit. All he has to do is temporarily disable withdrawal for a day and have all the miners work on mining deepcoin starting at difficulty 1. Before anyone realizes the deception, thousands of blocks would have been mined and probably close to a million deepcoins. Then when the miners see that they have generated thousands of DPC each versus not even 1 BTC, some might decide to stick around and see what happens. Some othe pools or miners might then join this so that they too can be early adopters of this new coin.

What do people think? Is this a plausible scenario? Tycho likely would not risk his deepbit earnings to do this? But a hacker could. That's why I think it's a bad idea to have one pool control so much of the total network hashrate.
1610  Bitcoin / Pools / Re: A proposal for Recent Shared Maximum PPS on: July 13, 2011, 06:06:09 PM
What I don't like at both SMPPS and RSMPPS is that the pool can be in dept a lot out of a sudden bad luck streak with potentially no way to recover ever (imagine having a really bad bad luck streak at the time right before the block reward is cut in half and a lot of miners leave!)

With SMPPS, a real bad luck streak right before a huge difficulty increase or block reward being halved could cause the pool to never recover. This is because new incoming rewards will not be enough to payoff the old debt. (Assuming due to the bad luck, there won't be enough new miners to make up for the harder difficulty)

But with RSMPPS, this is not the case. A bad luck streak will only affect the miners mining at that time. This extreme case will look just like a normal proportional pool to the miners. Since for each long round, they are paid their proportional reward and not the ideal PPS reward. If the pool ever recovers from the bad luck, the difference will get paid back. If not, then they won't get more for those shares, but then the miners are not worse off than if they were in a proportional pool. So the RSMPPS pool will not be burden by this old debt.

To me PPS systems still seem to be tha fairest ones, but with SMPPS or RSMPPS there is a risk involved that some shares will never be paid, if the pool hash rate has a peak at a bad luck streak.

Like Luke said, each share will be paid at least something. And that something will be equivalent to what you get in a proportional pool. If the pool gets a short round in the future, you may be reimbursed for the difference.
1611  Bitcoin / Mining support / Re: Any way to under clock memory in Linux for 6970 on: July 13, 2011, 10:30:18 AM
Yeah, the mem clock in level 2 cannot be lower than that of level 1 and 2. So what I do is just set the mem clock for all levels to the same and then just set the core clock for level 2. That works for me.
1612  Other / CPU/GPU Bitcoin mining hardware / Re: New command-line tool for overclocking ATI cards (Linux) on: July 12, 2011, 10:22:36 PM

Good stuff mjmvisser ... !

Yeah, seriously good stuff. Do you have a donation address?
1613  Bitcoin / Mining support / Re: Any way to under clock memory in Linux for 6970 on: July 12, 2011, 07:34:46 PM
I've been using atitweak: http://forum.bitcoin.org/index.php?topic=25750.0

I could set the memory to something low but it won't stick. It seems like mem clock cannot be more than 125 lower than core clock. Not sure why that is.
So if you set your core clock to 900, you can set your mem clock to 775 but not lower. Otherwise, it will revert back to 1375.
Thanks.
I tried with core clk 975 & mem clk 900 now with both aticonfig & atitweak. But still i am getting peak as 1375 for 6970 cards & no less in temperature also.
I used 11.6 catalyst.
Which catalyst you used?

11.6 also.

Paste the output of these commands:

aticonfig --adapter=all --odgc
atitweak -l
1614  Bitcoin / Mining support / Re: Any way to under clock memory in Linux for 6970 on: July 12, 2011, 05:15:00 PM
I've been using atitweak: http://forum.bitcoin.org/index.php?topic=25750.0

I could set the memory to something low but it won't stick. It seems like mem clock cannot be more than 125 lower than core clock. Not sure why that is.
So if you set your core clock to 900, you can set your mem clock to 775 but not lower. Otherwise, it will revert back to 1375.
1615  Other / CPU/GPU Bitcoin mining hardware / Re: ATI underclocking memory under linux? on: July 12, 2011, 05:13:14 PM
Try atitweak: http://forum.bitcoin.org/index.php?topic=25750.0
This new tools works much better for me.
1616  Bitcoin / Pools / Re: A proposal for Recent Shared Maximum PPS on: July 12, 2011, 04:32:16 PM
Anyone with the most basic knowledge of stochastic processes can see that SMPPS is a bad method.

There are two valid hopping-proof methods:

1. Geometric method. Cons: Requires implementation in logarithmic scale, has high (but tunable) variance.
PPS is a limit case of this.

2. PPLNS. Cons: Crosses round boundaries.

It looks like your RSMPPS is trying to take SMPPS and make it more like PPLNS. Better just use PPLNS instead.

(In case people mean the geometric method when saying "the cheat-proof method", please stop. "cheat-proof" is an adjective, not a name. Better edit the thread I guess.)

I agree that both geometric and PPLNS are pool hopping deterring methods and are fair. But correct me if I'm wrong (since I don't know the geometric method that well), they really only work well for people mining 24/7. If I'm not mining 24/7, I will be unfairly punished for looking like a pool hopper. RSMPPS works better in that case. Each submitted share to RSMPPS will always have the same expected return.
1617  Bitcoin / Pools / Re: [140 GH/s 0% fee SMPPS] Ars Technica community mining pool! on: July 11, 2011, 10:46:18 PM
You can now hide all those extra workers you created.

What happens when you hide a worker that you are currently mining with? I assume that would screw things up, right? You should probably only show the hide button if the worker is idle (when it's red).

Also, can you please sort the worker list by name? Thanks!
1618  Bitcoin / Pools / Re: [130 GH/s 0% fee SMPPS] Ars Technica community mining pool! on: July 11, 2011, 09:54:28 PM
I just upped my donation percent. Thanks for all your hard work!
You should definitely add some optional perks like miner idle emails.
1619  Bitcoin / Bitcoin Discussion / Re: Hypothetical Bitcoin clone except backed by gold on: July 11, 2011, 07:13:44 PM
Quote
I think anyone can mine the goldcoins, and then redeem them at the exchanges for gold.

I don't think that's the OP's idea.

Why would any exchange back goldcoins with physical gold when anyone can mine for goldcoins? Exchanges like mtgox have traders on both the buy side and the sell side and that's how they come to the USD/BTC exchange rate. You don't just start an exchange and permanently set the exchange price yourself. If you do that, you will find that people will trade the worthless goldcoins to you for real gold and no one will trade away real gold for these goldcoins.

Only governments can really pull this off. That's because governments have a lot of gold, they have an incentive to make fiat currency successful, and they can force their citizens to pay tax in fiat currency. Tax forces people to have to trade in their gold for fiat currency. None of this is true for goldcoins.
1620  Bitcoin / Bitcoin Discussion / Re: Hypothetical Bitcoin clone except backed by gold on: July 11, 2011, 06:59:44 PM
There are just so many potential problems with this idea:
  • You want to have a central authority distribute goldcoins and have them store gold as backing?
  • Is the central authority going to pay to store the actual gold needed for backing.
  • Where does that money come from?
  • Who is this central authority and why would they do this for free?
  • Why would they not steal your gold?
  • Where do the goldcoins come from if not mined?
  • Does the central authority just mine the goldcoins themselves and then sell it for gold?
  • If mining does not create goldcoins, then there would be no miners. If there are no miners, who keeps the blockchain secure?
  • Where does the initial trust for goldcoins come from? Why would I use real money/gold to buy goldcoins?

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