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1  Economy / Economics / Mt.Gox Accounts and passwords released, impact to BTC econ on: June 19, 2011, 08:18:33 PM
How do you think the released passwords for MtGox accounts will impact the BTC price? Personally, I think it will drive the price down, because of the bad publicity related with such leaks.

P.s. <- The file with the accounts and  hashed (maybe salted too?) passwords.
2  Other / CPU/GPU Bitcoin mining hardware / 6950 + system hanging on: June 15, 2011, 09:53:41 AM
Hello guys.

I am mining with 2x unlocked XFX 6950's. Lately I've been trying to find an overclock that's stable with 63% fan speed (night-mode), but all of them are pretty much unusable, and the way it crashes the system is very weird - on a "bad" overclock firstly the cards heat up to working temperature (between 65-80 depending on mV and mhz) and then stay there for a while (from 1 to 60 minutes); then, suddenly temperature drops on a single card, and the hashrate halves. If I move my mouse, the computer hangs. If not - the second GPU continues to mine for a little longer (2-3min) before a total freeze.

What surprised me the most, however, was results I got from last night:  I let both of them run @ 1100mV(stock voltage) and with 900mhz core/625mhz mem and went to bed after 20-30mins of it being stable. It ran smoothly for an hour or so (according to BTCGuild logs) and crashed an hour later. I surely thought running it on stock voltage and such a low overclock (stock max is 840mhz core) will help the stability. I am sure it crashed the same way (single gpu halting for no reason, and then, even with 99% usage dropping temperature until a full system crash).

What could be the reason for such weird behaviour? What kind of overclocks do you have on your 6950s?
3  Bitcoin / Mining / GPU overclocking relation to hashing power, hanging on: June 01, 2011, 04:06:55 PM
Hello everyone.

I was farming with a single XFX 6950 (flashed shaders, 1145mV, 940mhz core/ 625mhz memory ~ 405mh/s) for a while now, and got another one today.
Curiously, when I stuck it in, overclocked it with MSI Afterburner, they make the entire system hang in around 3 minutes. At first its the UI, then the mouse freezes as well.
Now I'm running them both at 1145mV, 920mhz/625mhz at around 390mh/s or at a total of 780mh/s and it seems stable.

Should I up the voltage, or the memory clock, or something for them to be stable at 940mhz core? I am not sure since if it would lack juice it would hang immediately, not after 3-5min of hashing. The temperatures don't go above 75'C.

The power supply is a Corsair TX750 V2 and I'm using GUIMiner.
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