In the advanced video options in L4D there's an option called multicore support (or something like that), disable that option and it should work normal for you :) .
Jonah Hirsch wrote: > I know this isn't the technically correct place for this, so ignore it > if you must. > > While playing Left4Dead, my CPU reports 100% usage on BOTH cores. Even > though it says that, I'm seeing no choppiness or anything negative > towards the performance. > > CPU: Core2Duo E8400 (3.0GHz) > GPU: nVidia GeForce 9800GTX (512 MB) > 2 gigs of RAM. > > I googled around, and say others had this problem, some with, and some > without performance issues....can anyone else confirm this, and if it's > a serious problem? > > _______________________________________________ > To unsubscribe, edit your list preferences, or view the list archives, please > visit: > http://list.valvesoftware.com/mailman/listinfo/hlds > > __________ Information from ESET NOD32 Antivirus, version of virus signature > database 3626 (20081119) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > > > _______________________________________________ To unsubscribe, edit your list preferences, or view the list archives, please visit: http://list.valvesoftware.com/mailman/listinfo/hlds