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I was curious if this RAM:
http://www.micron.com/parts/modules/ddr3-sdram/mt8jsf25664hz-1g4

would run nicely with the other ram and my late 2012 iMac? I pulled it out of my 2010 or 2011 mac mini if I remember right.

It is only 4GB, but I figured it could be a little added bonus until I get enough money for 16gb ....

This RAM would lead to a mismatched speed and CAS latency. There are people on here who know can probably explain better than me what the net effect would be to your system. If I'd have to guess, I'd say it the RAM would be a bit slower, but the extra RAM (depending on what you have) would more than make up for it.

It's worth noting that mismatched RAM can lead to unexpected/flaky behavior. I this isn't a mission critical system, I'd say drop it in and see how things behave. It's not like it'll fry your motherboard.
 
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