It might be worth trying out a "dummy plug" for the 6970. Easiest way would be with a DVI-to-VGA adapter, and 3 resistors with their legs in the appropriate VGA pin holes. That makes the 6970 "feel" like there's a monitor plugged in; otherwise, it might be going into some stand-by / power saving mode.

FWIW, i haven't had that happen with my 5850 nor with my 7770 (both secondary cards in my respective mining rigs), using Catalyst 12.6 on both.

Also, you might wanna consider changing the login to stratum.bitcoin.cz:3333 Less load on Slush's servers (due to using the Stratum protocol instead of the getwork on the api/api2 servers), plus "just" 2% fees (as opposed to 10% fees on api/getwork).

You seem to have had some SERIOUS connection issues, and/or not that great a hash-rate(?).

With about 1.7Ghash/s, i submitted 4743 shares in round #18282, 5782 shares in #18283 and 7264 shares in #18284. The rewards were normal (considering the pool hash-rate, and the difficulty), in the region of 0.0038-0.0042btc per round.

The way Slush's scoring system works is, the more recent the submitted shares, the more they're worth. Which is to say, if you submit, say, 2000 shares at the beginning of a 3h round, and then your 'net connection fails or something, you won't get much (if anything) as a reward. This is meant as a pool-hopping deterrent. On the other hand, if you DO reconnect a while before the round happens to end, you CAN get back up to speed in minutes

If i got an average of 0.004btc for the 4-6k shares submitted in ~3h, you shouldn't be surprised you got zilch for ~100 shares submitted in the same time :/

I'm gonna hazard a guess, and say that he was talking about  your power supply High-end cards need a lot of "juice"

Great tip

Try connecting to stratum.bitcoin.cz:3333 api/api2 use the getwork protocol, which is "on its way out" (will be deactivated in the near future).

I remember reading somewhere that the bandwith needed is merely a few KB per *minute*, so i highly doubt you'll "feel" much (if any) slowdown

Let's try this another way: what GPU do you have?

3h24 left here...  

Still, could be worse - at least it's not 10 or some preposterous figure...

Ditto

Actually, a friend got me started on them, about a year ago

... And here's yet another example of a post