..tried the same thing with my msi-6168 mb,and while all the cards (the integrated v3 and the 200sbi) install fine,the desync+glide lockup problem prevails.I'm starting to think this is actually a dx9c problem (I have installed the last win98se compatible dx9 release,as I didn't have any problems with it before).I think I'll do one last reinstall and load dx7a,that should be old enough to not cause any problems..
edit: well I'll be damned.cleaned the system with dxbuster,loaded dx7a,and right now I'm running stable for more that one hour (max I got before was 10minutes).you gotta love M$
edit2: tried dx8.2 (the last of the 8 series,it seems),and everything is stable as well.that means if you want to build a legacy system with v2sli,you should stay away from dx9 (under win9x.I'm not sure if the same applies to win2000/xp,but probably yes).I'll probably try to narrow it down to the conflicting dll(s),maybe I'll be able to come up with some hybrid distribution of dx9,or perhaps just some dll overrides..
/bit unrelated: I'm quite surprised that the 200sbi has no problems running with a v3 as primary card,I was under the impression that v3+v2 under win9x=no love.I think the custom q3d drivers made the difference