proportional...and yes you should run your miner with gpu specific flags..-w -v 128 -f 1 through 120 depending on whether you wish to use the system for anything other than mining...I use -f 60 and my day to day usage seems acceptable..
Is proportional
http://mining.bitcoin.cz/ ?
that's score based... I recommend deepbit
score base is good if it's a dedicated mining rig IMO, or if you 24/7 often.
I see. I get it. Proportional deepbit then? Thanks!