I was happily mining avg 148 000 khash/s with my 5770 but after reading the original post a little closer and trying the
Known best settings I instantly juiced it up to 170 000 khash/s! Important lesson learned, read things thoroughly or don't bother at all.
Known best settings
(please PM better/best settings for your platform)
Windows 7 64, Stream 2.2, AMD 5[7-8]70
use '-v -w 128' with '-f 30' on 5770 (160 MHash), '-f 5' on 5870 (318 MHash)