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1  Bitcoin / Mining / Re: How much does it cost YOU to produce a bitcoin? on: July 13, 2011, 09:18:05 AM
Costs me an arm and leg, in future maybe kidney.
2  Other / Beginners & Help / Re: Gold vending machine - What do you guys think? on: July 08, 2011, 10:03:10 AM
that's a lovely scam.

a 2.5 gram bar for 100 GBP.

at current gold price (29.77 GBP per gram), that bar is actually worth 74.43 GBP.

for the 250 gram bar at 10,250 GBP, the actual value is 7,442 GBP.

If you have some collectible made of plastic do you price it by it's weight times plastic price?
3  Other / CPU/GPU Bitcoin mining hardware / Re: PCIe extenders in Europe? on: July 07, 2011, 09:33:28 PM
http://www.aliexpress.com/wholesale?SearchText=pci-e+riser&catId=0

Got 10 pci-e 1x risers shipped in under a week via DHL from HK. And I live in scandinavia (northern europe). Wink
4  Other / CPU/GPU Bitcoin mining hardware / Re: Possible alternative uses for the rigs on: July 07, 2011, 09:29:42 PM
cracking passwords  Roll Eyes

Is there a version of those tools for ATI/AMD cards? It's just nice to test it out on locked ZIps,Rars I forgot passwords to from years ago to rescue my work files.



http://www.golubev.com/hashgpu.htm


http://whitepixel.zorinaq.com/
5  Other / CPU/GPU Bitcoin mining hardware / Re: Peltier cooling on: July 07, 2011, 08:55:22 PM
Peltier cooling is terribly inefficient you put in 100W of electricity you get 50W of heat removal from the source at 10 degrees celsius difference. So now you need to cool 100+50= 150W of heat. Also you cannot cool any modern graphic chip with 100W peltier (the chinese cheap peltiers you find on ebay are marketed by their electric consumption watts). This thing scales up as terribly inefficient. http://www.customthermoelectric.com/tecs/pdf/19911-5M31-28CZ_spec_sht.pdf just look at that graph you find bottom left. It can move 400W of heat at zero degree temperature difference at the same time it's also taking in 694W of electricity which it is rated at. With same consumption it can remove 330W @ 10° C difference.

Ok now you need to be able to cool all that power. 330W + 694W = 1024W of heat coming from that system. If you can keep your cooling system at room temperature level for long periods of time maybe then you need to worry about condensation. But let me tell you when starting to play with peltier, condensation will be least of your problems. You really need direct watercooling for peltiers at that level, air is out of the question. I use this example to explain the problems to explain some things you need to understand your mileage may vary.

Also you need separate psu for that peltier 24Volts that can easily deliver required 28Amps thats around 700W atleast and safe margin on top of that.

Instead get window airconditioner and put the condensator into a box of water and run that to cool your equipment with water loop. Normal portable airconditioner around here (northern europe) take in 900W of electricity and through phase change remove 2600W of heat from the source.
6  Bitcoin / Mining software (miners) / Re: further improved phatk OpenCL Kernel (> 2% increase) for Phoenix - 2011-07-06 on: July 06, 2011, 01:39:30 PM
from ~402Mh/s ---to--- ~405Mh/s   Shocked and I have 4x5850 sapphires each clocked to 1000Mhz.


Will take time to see what stales rate will be. With the last kernel it was around 2-3 %. Usually closer to 2%.


PLEASE KEEP THESE COMING  Grin
7  Other / Beginners & Help / Re: Mining Hardware Failure on: July 04, 2011, 01:32:30 PM
I you want your hardware to last long time then don't buy sapphire. I already got one faulty graphics card even out of the box. People are complaining that fans in sapphire cards die after even a month. 2 months seems to be maximum expected life for sapphire cards.  Roll Eyes
8  Other / Beginners & Help / Re: Warren Buffet and Benjamin Graham - Don't buy something you don't understand on: July 04, 2011, 11:56:41 AM
I bought computer hardware which I understand, creating bitcoins with it is an extra feature. Wink
9  Other / Beginners & Help / Re: Gold vending machine - What do you guys think? on: July 03, 2011, 10:40:38 PM
Does it accept bitcoins?
10  Other / Beginners & Help / Re: What is the BEST way for me to mine with Nvidia GTX 460 and Intel Quad Core on: July 03, 2011, 08:36:55 PM
best way for you would be selling your nvidia gfx and buying AMD/ATI instead. I think you will be able to find good candidates among AMD lines in threads already existing.
11  Other / Beginners & Help / Re: further improved phatk OpenCL kernel (> 2% increase) for Phoenix - 2011-07-01 on: July 03, 2011, 06:37:59 PM


http://i55.tinypic.com/2q0kq69.png

Testing my new Sapphire 5850
I need new PSU and watercooling for the card to make it stable. Currently running cards (overnight) steady at 412 Mh/s @ 1030 MHz core and other one ~360 Mh/s @ 950 core because only AGGRESSION=8. Psu is Corsair 450W so cannot OC & OV both cards  to the max. For the first card this mod gave increase from 401-> 412 while card is running @ 1030 core.
12  Other / Beginners & Help / Re: Introduce yourself :) on: July 03, 2011, 03:08:07 PM
Hello

Sending my first post to this thread. I don't like it when other boards are restricted.
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