most cards should not go above 70 degrees, or the risk of overheating or failure increases dramatically. 79xx series cards might handle 75 okay.

anything higher is straying into the danger zone, and may work for a while but pre-mature failure can be several times more likely at 80c vs 75c


also, rapid heating or cooling of the card can create issues. (ie: starting the miner immediately after turning on the system, or vice versa, without allowing a low amount of load to run for a while and bring the card to a moderate operating temperature (40-50c) and warm up before taking it to extremes, mostly due to thermal expansion being able to create gaps between the heatsinks and chips or having the chips flex away from the PCB and break connection.


I found I could run a 6850 at 63c and 95% fan for a consistent 200Mhash, and am not planning to push it much further in overclock unless the heat level stays the same or can be dropped (mem/voltage underclock)

are they all gone? I would take 2 of them

it backed down to almost $150 now. What's happening looks like 1 of 2 things (or both combined):

1) the bubble has burst. The climb from $20 to $280 was an obvious bubble, but no-one knew its ceiling (my guess was gonna be around $350). The drop in price has multiplied perceptions that the ceiling was hit, and we will see very rapid rippling of this across the network. and will test a lower valuation limit today or tommorrow. (probably around $100) and bounce up to hunt for a new happy medium around $125-$200 range

2) BEAR RUSH. This is more common then many might think, and boils down to a few heavy hands that hold thousands of coins putting a significant portion for sale below market. this drives down the asking price, saturates the market, and triggers others to panic sell. The heavy hands then re-buy for cheaper and walk away smiling. Right now we would be in the tail-end of this mechanism, and should see some large asks in the 125-175 range as these people rebuild thier wallet with almost 2X the coins they had prior.


I think both have occurred, and its hard to judge where the price will level out. I think >$100 is entirely justified for bitcoin at this point, and we could easily resume the rally at a more linear pace to test $300 again this week.

it backed down to almost $150 now. What's happening looks like 1 of 2 things (or both combined):

1) the bubble has burst. The climb from $20 to $280 was an obvious bubble, but no-one knew its ceiling (my guess was gonna be around $350). The drop in price has multiplied perceptions that the ceiling was hit, and we will see very rapid rippling of this across the network. and will test a lower valuation limit today or tommorrow. (probably around $100) and bounce up to hunt for a new happy medium around $125-$200 range

2) BEAR RUSH. This is more common then many might think, and boils down to a few heavy hands that hold thousands of coins putting a significant portion for sale below market. this drives down the asking price, saturates the market, and triggers others to panic sell. The heavy hands then re-buy for cheaper and walk away smiling. Right now we would be in the tail-end of this mechanism, and should see some large asks in the 125-175 range as these people rebuild thier wallet with almost 2X the coins they had prior.


I think both have occurred, and its hard to judge where the price will level out. I think >$100 is entirely justified for bitcoin at this point, and we could easily resume the rally at a more linear pace to test $300 again this week.

Im hoping to stick within TTC access for this posting

I am looking to get a mining rig (or multiple) configured, and need the parts to make it happen!

Basically I am looking for anything; GPUs (5xxx or higher), Mobo/CPU combos, PSUs, entire rigs, and even FPGAs

would also offer to host other rigs if offered an appropriate agreement for cost/profit splitting

So i now have the rig up and running. I have GUIminer running on the HD 6850 overclocked from 775->820 and mem down from 1000->920 with very slight undervolting. It stays around 61 degrees celsius for the most part. With these tweaks, and the "-v -w 128" flags I have gone from a stock ~140mHash to ~200mHash and feel i might get more from a further overclock.

the CPU is running in scryptminer and producing about 4khash per core towards litecoin. (about 15khash average total) This is running with flags : "START /LOW /B minerd.exe --algo scrypt" and I am sure could be further optimised.


any suggestions? Obviously this is not a powerful mining rig, but from my operation so far, seems to be mildly profitable.  (In ~18 hours it has [through pools] mined 6 mBTC and 50 mLTC, and i pay around 9c/kwh)

the title says most of it all. I have a HD 6850 and an AMD 2x4 640 CPU. I know neither are particularly powerful, but with the recent value hike of BTC i tink they can turn a profit, or at least be an efficient way of buying BTC with my electrical bill. 

from my research, the HD 6850 should attain about 170-250MH/s for bitcoin at around 130w.  with litecoin it would likely see around 250 kH/s. I would try to underclock the memory and OC the GPU to make the best H/w ratio here.

I cant find much info about the CPU for litecoin mining, but would assume it can operate in the 20-50 khash/s range.



any suggestions or scripting i should use?

it would break even within 2-3 months of use if you could get it running in the next month. Within a year you would see an additional 3000-15000 depending on your power costs and bitcoin value.

how would you make the system though without ASICs? FPGA is the only way i know, and that would be more expensive wouldn't it? otherwise, 3500W would only run about 10GH of GPUs

I may be wrong, but looking at the blockchain link, it seems like your account has had withdrawals made to counter-act each deposit. do you trade a lot of shift between your own addresses to cause this, or did I mis-read?

I finally picked up 2 coins today at above mtgox pricing in hopes that i don't miss this crazy ride upwards.

As i see it, we will continue this almost-exponential growth to at least $200 before we slide back. If we get covered by a major news outlet or the AP, we could see very rapid climbs to $300

I should have bought when i saw it hit $30, in part due to asics being paid for in BTC. (sucks balls for anyone who put down BTC as payment for thier BFL products)

It is a 2-sided issue. As the value of bitcoins goes up, the profitability of mining also increases and we see more coins in the market

additionally, bitcoins are becoming evermore permenant and recognised. Thuis bubble has not been reported by most of the news sources i watch (ie local, CNN, the globe&mail, etc). A report about its new value could cause far more investors and drive it well past $250 in the short term.

I had 0.323BTc since when it was only $20 a few months ago. today i loaded up 2 more coins at slightly above market price in order to truly have a horse in this race. I can see us  flying upwards further, hitting resistance 9lets pretend at $200, selling down to $150 or less as a lower resistance, then running at it again to get to $250 within april

I am looking to buy 1 or 2 bitcoins at $150.    Is there a good site to do this through, or a user willing to do a private trade?


I will gladly work in small steps to avoid scamming/being scammed   (ie: ill buy 0.1 BTC and if it works well, 0.4 BTC, then 0.6 BTC, and so forth,  as neither e-transfer nor bitcoin charge fees


PM me if interested please!

So are they saying that because they cant figure out why its running soo hot it needs to be underclocked, they will send you extra units?

ie: will a single come with a "free" jalapeno?  I understand it would at least fulfill the hashrate promises, but this is so vague and would be a tremendous draw of supply and extra cost that I don't beleive they will carry it through.


as mentioned too, the lack of numbers is disconcerting. It sounds like they are fighting against overheating and/or related failure issues

you should just sell it to somebody else, nave clearly b*tched out of the deal

30A on 240V is over 7KW. If you only need to run 2052W, then 15A would be sufficient

I love the fact bitcoin has nearly doubled in value over the past 2 months, and HATE that i didnt own any before that happened!

still makes jeff a happy customer :p

however, it is a little worrisome we havent seen any further news or deliveries in the past.... 2 weeks? Didnt they mention something about shipping 12 a day?

selling an amazon gift card code for 0.3 BTC.  PM me for more details and to set up a transaction

update: will sell for 0.21 BTC, after looking at MtGox. I want to trade this today