I've seen a couple of reports in this thread of 4850's getting 80-90 mhash/s.  I've been mining on two for the past week and a half, trying to tweak them, but only reliably getting 55-60 out of them.  One is on a laptop, so that's to be expected... its gpu is clocked at 500 mhz by default.  The desktop's running at slightly over stock,  too, but I need to get the card cooler before trying any overclocking.  It's currrently running at 103 degrees C.  It's an old setup, so the fans could probably use some cleaning.  I've read that people recommend underclocking the memory, is that to reduce temps?

Most of this is a moot point, I was lucky enough to find a 5830 in stock at Newegg last week, so I'll get a nice boost in mining and gaming performance when it comes in tomorrow. I'll still want to use the 4850 in a linux server i have running, so I do want to figure out how to get that card mining optimally. I've looked at the mining hardware comparison chart, but I can't get anywhere near those numbers.

If it makes any difference, I'm running phoenix miner with fastloop, aggression 3, and worksize 128.  Trial and error has shown that seems to work well and allow the pc to be used.  Raising the aggression only gets me a couple mhash extra, but makes it unusable.  Raising it too high makes the pc crash.

I apologize for being long winded, I haven't had enough coffee this morning.  I guess I'm just feeling the need to vent and find out options to optomize my mining.

Oh, I've been mining on both systems for 12 days or so and have earned 1.15 BTC from the pool i'm connected to.  Is this low for 110-120 MH/s?


Edit: I think it's a cooling problem.  I stopped mining, let the GPU cool, then restarted it.  I was running at 67 MH/s until it hit about 100 degrees, then it dropped down.