Can I use Original Imac 1333 Ram on my Mac Book Pro I7?

Question

Hi everyone,
I have an 2010 I7 Imac at work with 8 Gb of Ram (2 x 4GB DDR3 1333MHz).
Can I use this ram in my Macbook Pro I7?
I realised that I'm using much more my MacBook than the Imac, so it would be more efficient for me to have 4GB in the Imac and 8GB in the MacBook.
The plan is to have the 2 x 4GB DDR3 1333MHz on the MacBook, and put the 2 x 2GB DDR3 1067MHz on the Imac.
Is this possible?
I read somewhere that it is possible, but they say that 1333MHz ram makes the MacBook unstable.
Is this true?
Thank you.

Answer 1

You're welcome
TBH I'm not actually sure how the Intel DMI determines memory speed - assume it's just a multiplier based on underlying clock speed. Whether that's controllable in BIOS-based computers, I don't know.
The most important thing is that it's running at 1066 (2x532), and that the CAS latency is the best it can support (7-7-7-20), which is what you seem to have
You often find 1333 memory that has higher latency like 8-8-8-24, which if you're being forced to run at 1066 would obviously mean it's worse than a specific 1066 module that has lower latencies. (since actual latency = time for a clock-tick x latency in clock ticks)
From reading the forums I think a lot of people make this mistake, thinking that the 1333 mem will necessarily run better, but don't consider the higher latency. You can get lower latency 1333 mem, but it's considerably more expensive.
http://www.overclockers.com/forums/showthread.php?t=619174