While Macs did have the same specs and connectors for SIMMs as PCs, they were much more picky in terms of which modules they'd accept. You could do some researc

While Macs did have the same specs and connectors for SIMMs as PCs, they were much more picky in terms of which modules they'd accept. You could do some research and find out which cheap modules were 100% compatible, or you could buy special Mac compatible modules for a quite notable markup from Crucial, Kingston and the like. This might explain the price difference.