well i disabled 2ttiminds and booted up at default 200x11 no prob although memory was then at 159.mhz...however i tried uping it to 205x11 an could not boot up with 2t timings disabled......

AMD64 3200+ 2.2ghz oc to 220x11=2420mhz
gigabyte GA-K8NS nforce3 250
patriot xblk 2-2-2-5-1t 512x2
windows xp pro sp2