I have a USB 2.0 eMac and would like to upgrade the memory. A quick google search + system profiler lists the memory as PC2700 memory. I swapped in a 512 PC2007 PQI ram stick along with the existing samsung one and my eMac didn't recognize it. I was under the impression that memory worked equally in macs and PCs? Is there certain ram I should buy for my eMac?