I have 24GB ram in my i5 27" but it is only utilizing 4GB. Can anyone explain why?

I have a 27" 2.9 i5 late 2012 iMac with 24GB of ram that runs very memory intensive processes, but the machine is only clocking 4GB of my availalbe (22gb?) of ram. I am getting a lot of unwanted video lag and delay. Can anyone explain? I should be able to at least squeeze out 8GB active ram, I would think, maybe even more.

Are you saying that only 4 GBs of RAM is being recognized by your Mac or your Mac is only using 4 GBs of RAM out of the total 24 GBs of RAM?
Where was the RAM purchased?

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