Yes xilin, 11.11 works great.

And I have no idea headygains, may have more help in another thread.
Mining doesn't work all that well with nvidia anyway.

I used this guide to set to 300Mhz.

As for the workload I don't see difference between 128 and 256, even by leaving out the workload command it's the same.

Alright thanks, it's working good now. Now I have a problem with lowering my memory clock because in CCC it doesn't go below 1050Mhz so even if I set it in MSI Afterburner to 525Mhz it doesn't lower it. Also could you write out how I could set the phatk worksize, thanks. I am at 270Mhs at the time of this post.

Oh wait, is it -w 256 to put in the .bat?
And nvm I got the clock to stay at 300Mhz, yay for quieter fans.

Alright so I have an ATI 6870, Bitcoin is up to date, GUIMiner is v2012-12-03 and the error I receive after putting my details to login to the slush pool:

2013-04-16 04:57:51: Listener for "Default" started
2013-04-16 04:57:52: Listener for "Default": api2.bitcoin.cz:8332 16/04/2013 04:57:52, checking for stratum...
2013-04-16 04:57:52: Listener for "Default": api2.bitcoin.cz:8332 16/04/2013 04:57:52, started OpenCL miner on platform 0, device 0 (Barts)
2013-04-16 04:57:54: Listener for "Default": api2.bitcoin.cz:8332 16/04/2013 04:57:54, diverted to stratum on stratum.bitcoin.cz:3333
2013-04-16 04:58:35: Listener for "Default": api2.bitcoin.cz:8332 16/04/2013 04:58:35, Verification failed, check hardware! (0:0:Barts, 926f966a)



Searched around on the forum for similar threads, no solutions that I can see.
AMD-APP-SDK-v2.8-Windows-64 is installed.
Set my GPU to defaults with no OC.

Also tried with phoenix miner and worked but that uses Getwork protocol and I couldn't get it to work with the Stratum proxy. Tried with cgminer and bfgminer, both crash on start after putting in my configs.
Would like if GUIMiner worked though, thanks and I hope for some answers!