How do I check the speed of the onboard RAM?

Open About This Mac from the Apple menu. it tells you there the speed rating of your RAM. Compare that to the Apple memory specs for your computer.

If you have not changed the memory in the computer, then Apple's installed memory will be the correct speed.

Here's what it uses:

The modules are 333 MHz.

Is this a continuation of an earlier discussion involving an iBook G4 1.42

14" portable, & RAM questions? {I found this while looking though...}

The topic of qualified RAM (& total iBook G4 1.42GHz/1.33GHz model

Mid-2005) was covered along with some other info in the other thread:

https://discussions.apple.com/thread/6017491?tstart=0

So, it appears now the original question should have said you were

trading RAM chips with an early MacBook (intel-based Mac) and

that means quite a bit; on somuch as they aren't interchangable.

And that does make a big difference, especially if troubleshooting.

Not compatible. And in my other reply did not implicate it was.

My early MacBook1.1 & iBook 12" 1.33 (mid-2005) can't share.

One is intel-based, and the other is PowerPC based architecture.

Did the 'non-tech Apple person' you spoke to know about this detail?

Good luck & happy computing! 🙂

OK...

Maybe. Easily confused, with the manner the topic was written and I wondered

because otherwise most of the discussion made sense, so that part threw me.

However, there are those who find a 200-pin chip and figure if that was OK

then a 204-pin should be even better, more or less; with a few pins to spare.

So, I wonder with a different reference in the same general topic. I've seen

a mix of different RAM chips between iMac (intel) and MacBook/Pro where

they fit but don't work under a load in one, but OK in the other. A low-power

chip in a portable makes sense with battery life, cooling efficiency, and etc.

But that is what specs are all about; something to throw into the mix, too.

Since the iBook G4 PPC with a different version of OS X does not have the

same kind of System Profiler info, linked in About This Mac, some aspects

of information between system architecture appears different. And in an odd

way, with the latest greatest OS X this difference in appearances also affects

how one may consider what is enough RAM; when in the older OS X the

same numbers may have not seemed enough. (Fact is, OS X still likes RAM.)

Good luck & happy computing! 🙂