memory bandwidth is important but it is of secondary consideration to cpu speed. as a rule of thumb try to wind up the cpu as far as u can run it and then run your ram, as in your case either 1-1 or 5/4 depending on how fast it will go
I'm using Kingston HyperX DDR3200 (BH5?), so I have to run it at 5:4 (196mhz) when the CPU is at 245fsb.
But it is running at good timings 2-2-2-5, so I guess that makes up for the 4 mhz I am losing?