Memory o/c

Hi all,
I'm running an i7920 and Asus P6T with a mild o/c.

BLCK 160
CPU 1.1000v
QPI 1.1000v
Dram 1.5v
All others on auto except the 6GB triple G Skill Ripjaws 1600 RAM which I'm running at 1280MHz with the correct timings of 8-8-8-24.
Everything is stable with no heat problems so my question is: Is it beneficial to up the RAM to 1600? If so, do I have to adjust ratios, voltages or up the BLCK as well?
Thanks

With the current BCLK of 160MHz change the DRAM Frequency setting to 1600MHz, which equates to a 10x multiplier. You shouldn't have to change any other settings other than the DRAM frequency.