As Sam has said, cas 6 with twcl 6 is not possible on this ic (BBSE), but I think cas 7 with twcl 6 will be the limiting factor. Also the bottom thirds can not run 9-9-7 and only 11-11-11 on the OC Formula for me so I think in reality for BBSE to competitive you would need 2900 7-9-6-18 and even then I am not so sure it can hang with 2860 6-10-6 PSC with ultra tight thirds.
Either way I can't wait to see what you do with these magical dimms