Well i can tell you, when i start posting here i had less errors with both cores and i had it overclocked.

I have a 3800+ X2 2ghz OC @ 2.6ghz with a 333mhz ram @ 420mhz.

now that i took off the overclock, i have my problems with dual core, so yes, overclocking reduces our problems.

I could try increasing memory timing but i dont know anything about it to be honest.