Well, I'm running the same cpu/mb as you have and it's running at 4.0 Ghz @ 1.312v, but I only have 4 GB's of 1600 memory. The thing with all i7's is they produce a LOT of heat, so if you have a good cooler push away, if you are running the stock Intel cooler I wouldn't take it off stock settings. If you are only looking to speed up your system by OCing your ram, don't bother, it doesn't give you a noticeable boost with day to day operations.