Ram from iMac late 2012 in MacBook Pro mid 2009?

[Pejsen]

Hi forum

I've been lurking in here for a few year, finally took the time to create a user recently as i bought my first ever iMac in the new Apple store in Hong Kong last thursday.

It's a 3.2ghz, 1TB, 675MX with 8GB ram

I've ordered 4x8GB ram from Crucial (2x16GB kits).

I have an old Macbook Pro (mid 2009) 2.53GHZ Intel Core 2 Duo. Currently has 2x2GB ram.

When I upgrade the iMac can I put the 2x4GB ram from that in my old MacBook?

Data from Crucial ram recommender:
iMac 2012 late kit:
Module Size: 16GB kit (8GBx2)
Package: 204-pin SODIMM
Feature: DDR3 PC3-12800
Specs: DDR3 PC3-12800 • CL=11 • Unbuffered • NON-ECC • DDR3-1600 • 1.35V • 1024Meg x 64 •

MacBook Pro mid 2009 (unibody):
Module Size: 8GB Kit (4GBx2)
Package: 204-pin SODIMM
Feature: DDR3 PC3-8500
Specs: DDR3 PC3-8500 • CL=7 • Unbuffered • NON-ECC • DDR3-1066 • 1.5V • 512Meg x 64 •

So it's the same size, the iMac ram is faster but i guess there able to 'clock' down backward. The obvious difference is the CL-timings and the voltage!

Should I try or just forget about and try and see if someone will swap ram with me?

 

[Pejsen]

This will not work.

For the sake of future googlers i just wanted to let you know - it doesn't work.

The Macbook Pro won't post anything on screen although you can hear the harddrive and superdrive spins up. I does like *BEEP* *BEEP* *BEEP*

 

[jimmywp]

PC3-12800 in older iMacs that call for PC3-8500

The original question asked about using PC3-12800 RAM in a mid-2009 iMac. He later reported it would not work - supposedly because the 12800's were not compatible. I have successfully installed 2 PC3-12800 2GB modules in a Late 2009 iMac. The memory specs for my Late-2009 iMac are the same as the mid-2009's -- up to 4x 2GB modules. I believe the problem was trying to use 4GB modules, not trying to use the PC3-12800 versions.

 

[attempt03]

Add-on 4gb PC3-12800 into two 2gb PC3-8500 older iMac

I have successfully installed 2 PC3-12800 2GB modules in a Late 2009 iMac.

Hello jimmywp,
Glad to hear you're successful.
Planned to add-in 4gb PC3-12800 (1600MHz) into my late-2009 iMac 21".

But, in Apple forum (https://discussions.apple.com/message/15141579#15141579) says it must be compatible i.e. it needs same speed of 1066 MHz, not 1600MHz.

Would you reconfirm again. Many thanks.