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Possible Duplicate:
How do I determine which MacBook hardware version I have? (for RAM purchase)

I have a mid-2008 Penryn 2.5 GHz with 800 MHz bus speed.

I have read that these machines can run with a 4gb and 2gb stick despite officially being limited to 4gb.

Is this true? How for sure is it to work, if so.

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marked as duplicate by BinaryMisfit Jan 18 '11 at 6:41

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

OS X is a hybrid OS, running a 32-bit kernel with 64-bit extensions (or pure 64-bit if you press the right key combo at startup). Whether or not the hardware supports it, the OS should. I'd plug it in and see for myself if it works. – user3463 Jan 18 '11 at 6:10
Seriously? the linked duplicate does not address the question I have. I read that question before posting mine. It's about how to determine which version of mac you have and has no information about RAM other than being mentioned in the question. If my question is going to be closed, please supply an actual identical question for me to look at since I did search before posting... – Damon Jan 18 '11 at 15:32
up vote 2 down vote accepted

I have read up on this too. My understanding is yes it works, however you will sacrifice some speed to do it because the memory has to be accessed differently. Unless you really need the memory, I'd not bother and just save up for a new machine.

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