I just upgradeed to a x1900xt and dfi nf4 ultra-d from a x800xt-pe and k8n neo2 plat nf3. I have had my memory for a while. It is 2x512 geil ultra platinum pc4200 3, 4, 4, 8 and has done 263 at those timings in the last system and a p4 with a ic7-g. the dfi will run it at no porblem at 200 but crashes anywhere above 230. I have tried vdimm up to 3.2. timings manually i.e enable, 3, 4, 8, 4 (i think that is the order) with all others on auto. I have also tried on auto all but the spd sets the ram to cas 2.5. the board is fine if I use a divider at 260 fsb so why doesn my memory freak out? I am new to dfi boards and the bios obviously has a lot of options, particularly for memory timings so please suggest anything that you think I may be missing. ta.