Here is my update. 1T does not work with TwinMos. Tried loose timings 4-4-8 tried Vdimm at 3.0V. Prime bombs after 15mins. So the final config with my TwinMos is 240 x 11 - 2.5-3-3-8. 2T. Anything beyond this is not stable.
Tried the new Beta BIOS for A8N-E 1005.002, it limits the Vcore to 1.550. that is not a problem, has ability to tweak RAM settings further. ofcourse i tried the other options and didn't work either. So this is how high my sandy goes, till i get twister. Now the objective is to look for not high Vdimm memory, but high Freq memory. Native 4000 or higher. and see if it is a problem. The Venice is doing 2.71 and stable.
There were many queries, so here is the final setup.
Rig 1: A8N-E, San Diego 3700 @ 2.65 CABGE, Coolermaster Ultra Vortex, TwinMos CABD RAM, 300 GB Maxtor DiamondMax 10. XFX 6800GT @ 400 /1100. PSU: Coolermaster Real Power 450W.
Rig 2: A8N-E, Venice 3000 @ 2.71, Coolermaster Ultra Vortex, TwinMos CABD RAM, 160 GB Seagate Barracuda. XFX 6800GT @ 400 /1100. PSU: Coolermaster Real Power 450W.
But the 1T really boosted my sandra figures. So guys thanks a lot for your help. Will now try to get memory which would allow me to run the setup at 2-2-5 1T. and see if i can go higher on clock. and loose the divider