Cheapest rig for cross fired 5870's

Surveyor said:
Don't you ever sleep?

Or are you still Bitcoin mining?
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My sleep pattern is rubbish, I have trouble sleeping sometimes! I found out these cards give excellent £/BC rate, better than most other cards which makes it within the realms of decent profitability if I get them quickly.
 
http://bitminer.info/ (figures quite under what can be achieved with some basic OC afaik)

I have a solo 5770 at the moment which works at a rate of 170mhash, overclocked this can go to 190mhash but I'm not too good at OCing and it's unstable but with some skill I'm sure you could get it to 200mhash.

I've heard that a 5870 can do 400mhash/s, 2 of them = 800 mhash/s.

Check out here:

http://bitcoinx.com/profit/

Electricity wise you're looking at £1.50-£2 a day. A 5870 can do ฿0.56 a day, 2 of them + OCing = ~฿1.20 a day.

BC is currently worth ~$20 each, (https://mtgox.com/trade/buy), I'm also gambling a bit that the value is going to increase as well, I'm trying to gain BC for medium term investment (~4 months or so).

So at $20 each you are earning ~$24 a day, minus $4 a day in elec = ~$20 clear profit. Cards are ~$400 total for 2, which means in 20 days they pay for themselves (and they have obvious resale value).
 
Dual 6990s should be able to pull B2.50-3 a day which is phenomenal, ~$50 a day at current rates. It's just going to take ~50 days to pay them off which is too long a time frame for me for that cost. Also, they are in short stock in a lot of places (especially USA apparently) for the specific reason of bitcoin mining.
 
By the way, if Bitcoins crash which isn't out of the realms of possibility, look out on ebay for an influx of discount 6990's.
 
Gullanian said:
By the way, if Bitcoins crash which isn't out of the realms of possibility, look out on ebay for an influx of discount 6990's.
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Discounted because they've been thrashed 24/7 for weeks or months on end.

And probably using the Extreme Performance BIOS which invalidates the warranty.

No thanks.
 
But what is the work being done to make these bitcoins?


I understand what was SETI, search for a signal out of snippets of data.

I understand Folding at home.
 
I admit my knowledge here is a bit hazy but as far as I know it's double SHA256 hashing a block header as part of a process of block generation.

We have mentioned in the previous section that adding a block to the block chain is difficult, requiring time and processing power to accomplish. So what incentive does anyone have to spend the effort to produce a block, if it takes up all these resources? The answer is that the person who manages to produce a block gets a reward. This reward is two-fold. First, the block producer gets a bounty of some number of bitcoins, which is agreed-upon by the network. (Currently this bounty is 50 bitcoins; this value will halve every 210,000 blocks.) Second, any transaction fees that may be present in the transactions included in the block, get claimed by the block producer.
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https://en.bitcoin.it/wiki/How_bitcoin_works
 
How does this look?

XFX ATI Radeon HD 5870 1024MB GDDR5 PCI-Express Graphics Card

Sapphire Pure CrossFireX 890GX (AM3) Motherboard - Retail

Corsair Enthusiast Series TX 650W V2 High Performance Power Supply (CMPSU-650TXV2UK)

AMD Sempron 140 2.70GHz (Socket AM3) Processor - Retail

Corsair Value 2GB (1x2GB) DDR3 PC3-10666C9 1333MHz Low-Voltage Single Channel Module (VS2GB1333D3)

I have a case + HDD's spare. Still a bit too expensive @ £520 :(
 
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