Update, passed 100 passes of test 5, but wont boot into windows...damn this infernal fussy board. For some reason, it really doesn't like CAS3. It even boots @ 250mhz 2.5-4-4-10 but once again, jams up at the verifying dmi pool data screen. So this morning I have been testing tight timings. Went for 219mhz 2-3-2-5 1T @ 2.8v and it froze before reaching memtest, dropped the Vdimm to 2.7 and now it's happily memtesting away 5 passes so far of test 5. This could take a while to find the right medium for this RAM. Hopefully it will hit 225mhz, in which case I will run 250x10 on a 9/10 divider giving me 225mhz on the RAM i.e. 225 2-3-2-5 1T which wouldn't be bad at all.... Orange slots are a complete no POST with 208mhz 2-3-2-5 1T which I know it about 16hours memtest stable, including gaming, so I put the RAM back into the yellow slots and hey presto, we have POST. DFI really did the number with these boards, they are just so fussy!!!! Oh well... Report back when I have more info.