So i'm running 1.5 gigs of PC-3200 in my iMac right now, and I plan on putting a 1GB stick of PC-5300 into my macbook, while leaving one 256 stick of PC-5300 in the 2nd slot. What would be the ramifications of dropping the displaced 256 of PC-5300 from my macbook into the third slot of my iMac?