What margin of error is allowable when selecting a second stick for dual channel mode

[demonspeed]

Just wondering how easily DDR-2 ram of various types runs in dual channel operation. For example, would two different brands of the same Micron D9 ram have a chance at working together ? Any system builders or others with experience in this able to comment ? I'm talking the new stuff. Cheers!

[StealthyFish]

Hmm... My guess is that it would be fine, since your interfaces are the same (of course) and the chips are the same. I doubt the chip controllers on the RAM PCB will mess anything up. But, I've heard people say that you do have a chance to get an incompatible stick becuase of a different week of production, etc....