IMac RAM upgrade: 2+2+8+0 Is it possible?

Hi all,
I would like to upgrade my iMac mid 2011 (21.5" - iMac 12,1), adding a module of 8GB of RAM to the original configuration (2+2).
I've been searching for a similar case here but I had no luck. All the questions I found were about adding a couple of modules, but my intention is to leave a free slot just in case I need it in the future for 8 GB more. Otherwise I would have to remove the original 2+2 modules, loosing them in the final configuration (4+4+4+4 instead of 2+2+8+8).
Is that possible? Theoretically, reading this Apple support entry memory modules should be of the nonparity type, so leaving one empty slot, we will lose the dual channel feature, but it should work fine, right?
Furthermore, if I install a 1600MHz memory module instead of the 1333MHz type that Apple specifies, would there be any problem? (I asume that, if I finally instal another 8GB module, it should be exactly the same type, so both should be 1600MHz modules)
Thank you so much in advance,
JC

You have an iMac. There are no modules with heat sinks for your computer. That would be for Mac Pros.
The performance issue is dependent upon what you are doing. When a task involves the use of memory, predominantly, then dual-channel can bring a substantial increase in memory performance. But not for everything.
As for the speed. There are substantial differences in 1600 and 1333 MHz modules that can affect whether they will even work.
Your iMac uses the same type of DIMM as laptops use. They are 204 pin SO-DIMMS, DDR3.
Look for the proper product at:
OWC
DataMem
Crucial.com

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    Message was edited by: kostby

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