81.0 C is very high IMO. So are your RPM's and especially your HW errors. I use 4 x 7950 and on every pool I'm set at 18,18,18,18 intensity. I can easily go to 19 or 20 but this starts causing the rejects to increase. Besides, I figure the less strain the better. I have my max. temp set at 70C in CGMiner. My TC is 22,400. All cards are always around 68C and RPM's 1800 to absolute max 3000 without air condiitioning. When air condtioning is on its 1800 to 2400 RPM. I never see even 1 HW error. IMO you are going to burn out your cards quickly unless you get the cooling down. Do you have a big fan ?
EDIT: I have 8GB Ram and 6 core processor.
Whats your card brand? is it asus?
I have MSI 7950, it run's under 80-82C, i Couldn't bring it lower
3 x MSI 7950 and 1 x Gigabyte 7950. Why can't you bring it lower ? You can adjust the --temp-target to 70 no ?
Here is my cgminer script:
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer.exe --scrypt -o stratum+tcp://pool1.us.multipool.in:7777 -u zepadee.1 -p x --intensity 18,18,18,18 --thread-concurrency 22400,22400,22400,22400 --auto-fan --auto-gpu --temp-target 70,70,70,70 --temp-overheat 80,80,80,80 --temp-cutoff 87,87,87,87 --worksize 256,256,256,256
Back soon.