In the narrow context of how fast that DIMM will get data onto a memory bus., yes.
In terms of performance that the user will perceive, there are numerous other factors that play a roll. For example, the upcoming i7 version of the iMac will get more throughput to memory than the currently shipping iMacs will with exactly the same kind of memory plugged in.
Historically, desktops will leverage memory clocked faster than laptops earlier in the product revision cycle. That's where more of the differences have sprung from. If not pushing the bleeding edge, which Apple does not, not much of a difference other than form factor at the DIMM level.
thanks for that.
http://en.wikipedia.org/wiki/List_of_future_Intel_microprocessors#Core_i3
the next upgrade should be pretty impressive with Core i3 and Core i5 (already iMac is impressive)