How much you bought?

wonder rd200 is whether same as sli-dr expert since both boards layout is almost identical.

well, I just want to correct what mnemonic_80 said.

Orange for TCCD, yellow for BH5 only applied to NF4 ultra-d/sli-d/sli-dr, but not to Expert and Venus.

if you put BH5 into yellow slot on Expert and go oc it, even a bit, you'll notice something during loading windows.

actually, for nf4 non expert or venus, both yellow or orange slot work fine for tccd & bh5, but bh5 on orange and tccd on yellow can be overclocked better.

but for expert (not sure about venus), you cant overclock well if you put bh5 on yellow slot.

not sure that how far you measure "wont boot at all" ? you tried it more than 50 times? or just 10 times?

I cannot say that every dfi nf4 also act weird like what I experienced, but what I noticed was I used ultra-d rev.AD0 and rev.AE1, sli-dr expert, all have the same problem. I owned 4 BH5s and 2 BH6s, when I installed in the same yellow slot, sometime it can boot easily, sometime cannot, even I tried till wanna give up also like that, but at last can booting up (thanks to my patient ).

woow...you're lucky ya, get a superb mobo with cheap price