Oh, just make sure the frequency stays at 1600 or lower. If you can simply specificy the frequency then do that, if not there will be a boot strap or similiarly named setting for the RAM you'll be able to change. I'm not familiar with the i7 because the memory is direct to the CPU, so it may be different.
Leave the timings as is, just make sure the RAM doesn't go over 1600.
If you're still confused, hopefully someone who overclocks i7's will post up and clear it up for you. I'm still living in Northbridge world.