Much slower than expected HD6950

[braunshedd]

I just set up a XFX 6950 on ubuntu 12.04 with the proprietary drivers (from amd website), and have downloaded and configured poclbm.
Issue is looking at the hardware comparison, I should be getting ~300+ mh/s, yet I'm only getting 200mh/s. Not really sure what the problem is.
Any ideas?
flags used: -v -w 128 -f 1

[Unacceptable]

Get rid of f1 & up the core to 850-915.You may need to up the voltage a little to get the core stable.

Drop the memory down to 975 or lower.Watch temps,around 70c is great.

I get 350-360mh/s with mine & they are the cheap ones.I have to have 2 fans each blowing em,one on the back,one on the bottom,pushing cool air to em.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814150523

Not all 6950's are the same so you'll need "play" with these settings.

Good luck!!

[braunshedd]

Will that really make 160 mh/s of difference? Is it the miner I'm using or something in the os perhaps?
Yep, that newegg link's the one I have too

[Unacceptable]

I'm running Win7 with GUIminer,-w 128 -v.I'm running 11.5 drivers & 5/21/2011 GUIminer.For some reason the newer versions of GUI reduce mh/s.

I can get 375-390 mh/s,BUT my temp hits 85c,so I crank em down to get 70c-75c

BTW kick the fan to 100%,you'll need it

It took some OC'in.I'm a gamer & gamer PC builder,so it was just like tweakin for a big match.

It might be your OS.I have no clue about Ubuntu,my software skills suck

[bitstory]

Don't run your fans faster than 75%! They will die quickly.

[Unacceptable]

Well,I've been mining on my 2 6950's since june 2011 with the fans @ 100% & not a stutter.

Results will vary,but aftermarket heatsink/fans are cheap & easy to install.

[braunshedd]

So the consensus is just to overclock my way up?

[Unacceptable]

Yep

Any luck