Question About Laptop/Netbook Memory Speeds

[poofyhairguy]

So I am overclocking my new netbook the 311 and I have got its N270 Atom up to 2.3 GHz stable. The bios option that allows me to do this also allows me to set a 3:2 FSB to DRAM ratio.

My question is:

Is there a certain speed that would be more efficient to run the RAM at since it shares with the GPU, or should I just put it at the max value (1275mhz)?

Never overclocked a laptop before with shared memory so I thought I would ask.