Zend certified PHP/Magento developer

Where to put faulty RAM?

I have dual channel motherboard and two pairs of memory cards of which one of other pair is a bit faulty, one bit or something. I found out that I can disable Linux from using the bad RAM addresses, but does dual channel still work, as those two cards are not identical due to other one being faulty?

Does it matter in which slot I put the faulty RAM card? I mean if I e.g. want to boot something from USB, the software does not know about the faulty RAM, and I want to minimize the possibility of that using those faulty addresses.