Quote Originally Posted by Boris View Post
Nope. The signalling speed doesn't change if you go from single to dual.
If the ram is rated at 800mhz dual channel speed, it will run at 400mhz in single channel. Is that not clear?

Quote Originally Posted by Grizzly View Post
This is correct.
And even if it did, lower clockspeeds means your ram can run at significantly lower timings, which negates the mhz difference.
if you just go with the factory settings you won't get those tight timings that negate the drop in speed, unless you manually set the timings yourself in the bios.