returned to 8-7 and got the 2100fps
also 8-6 yeilded about 2300fps, but was pretty unusable, prior to 8-6 it was consistantly ~2000-2100fps
I know glxgears isn't a true benchmark, but it works for comparing results on the same machine to some extent. Besides I can barely play ut2004 on 8-8 now the frame rate is so bad.
As far as stability: 8-5 and 8-6 segfaulted on just about anything. 8-7 works nicely. 8-8 has crashed my system a couple of times (once on when switching a youtube video from fullscreen, and another time when playing around with gxine's visualations.)