Q: RAM replacement question

It's possible that it could work, depends on what they wrote to the SPIDIF chip… shouldn't hurt to try to.

First, look here....

http://www.datamemorysystems.com/apple-imac-intel-memory-upgrades/

Drill down and compare the memory specs of both iMacs.

if they don't match, don't give up yet!

Most iMacs can use memory from the next generation with no problem.

Chart of iMac models...

https://en.wikipedia.org/wiki/IMac_(Intel-based)#iMac_Core_Duo

However, the problem is not with the size of ram, but with MIXING different speeds...!

Pull the two old 1067 memory out, install the four 1333 chips in, try to boot.

Three bongs, no go.

Lets swap...

This is not a sale, no money involved, just postage.

Send me your address, to forum_username at Verizon.net...

I will send you four 2 gig chips from an early 2009,

they should work in your late 2009...

You then send me the four 1333 speed 2 gig chips,

I can use them in my mid 2011...