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1281  Bitcoin / Mining software (miners) / Re: Using poclbm With The phatk Kernel on: June 23, 2011, 04:08:00 AM
I'm running poclbm with a hash rate of 202 MH/sec per overclocked 5770.  Can I expect better with phatk?

When I tried phoenix my rigs had higher CPU utilization and became unstable.
1282  Bitcoin / Bitcoin Discussion / Re: Next difficulty in approx 3 days?? 1,240,416 on: June 23, 2011, 03:36:49 AM
I dropped out of bitcoin mining back in July 2010 after solving two blocks myself on the CPU miner then available.  We had no pools back then and the difficulty jump made it unlikely for me to earn any more coins.

I rejoined mining recently. My current rigs are GPU miners that rate a total 1200 MH/sec.  Assuming projected difficulty trendlines, I suppose that I can mine 50 or so more bitcoins before I'm at cost parity with my daily electric bill of 2.40 USD for the 860 watts consumed - and I operate them without air conditioning.

I'll liquidate the rigs beyond what I need for everyday computing when that time comes.   And I'll be alert for the next cost-efficient mining hardware advance - it could come from ASIC, or perhaps AMD will recognize the bitcoin mining marketplace and develop a variation of their existing GPU architecture for bitcoin mining, e.g. just lots of low-voltage Stream Processing Units.
1283  Other / Beginners & Help / Re: [POLL] Do you need an easy security HOWTO (+ operating system)? on: June 22, 2011, 05:55:33 AM
I would like the reference bitcoin client to strongly encrypt its wallet.dat file and make me enter a password to use the client application.  I would like computers and mobile devices hosting bitcoin clients to be compliant with Trusted Computing so that I do not have to worry about malware and keyloggers.
1284  Other / Beginners & Help / Re: solo. on: June 22, 2011, 05:48:17 AM
The problem is that even 10,000 MH/sec is a small fraction of the largest pools such as BTCGuild.  As of this moment BTCGuild has an aggregate 2,353 GH/sec rate and discovers 40+ blocks per day.

A solo miner competes with the large pools and there is a significant chance that the solo miner will not solve a block before the next difficulty increase, whereas pool members get proportionally rewarded each time the pool solves a block.

Suppose that a solo miner could have a large enough fraction of the overall bitcoin network hashing power, say 10%, then it would be better to go solo because even the zero-fee, i.e. donation pools keep the transaction fees due to block-solvers.
1285  Other / Beginners & Help / Re: What will happen to bitcoin when it gets cold? on: June 22, 2011, 05:38:20 AM
I put my mining rigs into the crawl space under my house to avoid the air conditioning overhead.  Here in Austin the outdoor summer temperature is over 100 degree F, but the rigs enjoy a steady 86 degree F environment.  In the winter they will keep the water pipes under the house from freezing!

1286  Other / Beginners & Help / Re: Anyone knows where can i get a 6990 graphic card? on: June 22, 2011, 05:24:06 AM
Here is what a review site says about the Radeon HD 6990 ....
Quote
Under the hood, the HD 6990 is nothing more than a pair of HD 6970 Cayman GPU cores that have been binned for low leakage ASICs and downclocked to meet the temperature and power commitments of the card's design. The HD5970 was built to fit into a 300 watt profile while the HD 6990 is designed to fit into a 375 watt profile with the ability to bump up to 450 watts via the AUSUM switch. This switch (used on all HD 69XX series cards) now gets a new function as an overclocking switch that loads a new voltage and clock speed profile. Something the HD 5970 lacked. This one change bumps the core clock speed and voltage up to meet HD 6970 clock speeds of 880MHz from the standard, as delivered HD 6990 clock speed of 830MHz. More changes that include refining the cooling design and voltage circuits promises a new take on the dual GPU, single PCB, video card.

For bitcoin mining purposes, you are better off installing two or more lower grade CPUs on separate cards.  The HD 6990 simply fits too much processing power in a single package and when overclocked, runs very hot and uses lots of power compared to alternative configurations. 

I chose to build three rigs each having 2 HD 5770 GPU cards.  In total they draw 850 watts and deliver 1200 MH/sec.  Because they are six separate cards I can run them in the non-air conditioned crawl space under my house.
1287  Other / Beginners & Help / Re: Rate of processing power increase on: June 22, 2011, 05:11:00 AM
Quote
Given that we are now at difficulty .877 million, and the average rate of difficulty increase over the last 8 months has been about 55% per two weeks, we will reach difficulty 10mil+ in 13 weeks. At that point an electricity cost of just $.15 / KWH is going to be enough to make mining unprofitable on a machine that nets ~2Mhash/W (2x5870).

Absolute rig size is not so much the determining factor as compared with hash rate per watts consumed, and the administration effort of looking after the rigs.

My dedicated mining setup is 6x5770 on three motherboards with three power supplies and one UPS. My Kill-a-Watt measures 850 watts total drawn by the UPS and I get 1200 MH/sec with overclocked GPUs.  The rig is designed for optimum power efficiency given the GPU cards that I could obtain.  Although I live in Austin, Texas and subscribe to our local utility's green power, i.e. wind power program, the cost of electricity is .085 USD per KWh, or about  1.73 USD per day.  Despite the 100 degree F days, I situated the rigs in the crawl space under my house, and enjoy a steady 86 degree F ambient temperature without air conditioning. I have configured the software, linuxcoin, to automatically restart in case of communications failure with the pool, namely BTCGuild, therefore I do not need to physically access the rigs much.  I use the pool's account page and the Google Chrome web browser Bitcoin Mining Monitor extension to check mining worker status from time to time.

The air conditioning point is important.  For many home miners, running the rigs indoors, the cost of air conditioning adds to the cost of running the mining rigs.

I hope to be among the last to unplug my mining rigs - liquidating the components, when it becomes unprofitable to mine bitcoins with a GPU.
1288  Bitcoin / Bitcoin Technical Support / Re: How long to start generating BC's? on: July 13, 2010, 08:31:54 PM
http://theymos.ath.cx:64150/q/getdifficulty

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1289  Bitcoin / Bitcoin Discussion / Re: Post Your Hash/Sec and Hardware on: July 13, 2010, 08:14:23 AM
Ubuntu 10.04
AMD Phenom II X4 920
4 cores
2.8 GHz
8 GB RAM
2718 khashs/sec
the bitcoin process runs on all cores but is "niced" to yield cycles to ordinary processes

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