iMac you see is not all 16 GB of RAM installed

I have a 27 "iMac late 2009. I7 2.8 GHz I had little RAM this Christmas to upgrade the stock 4 GB it came with.

I put sticks of 4-4 Go inside, but he sees only 8 GB of it. I have re-sit and rearranged the papillotes a few times, but he sees more than half of them.

Here's what the information system on the memory page looks like:

Could there be an EFI update or something escapes me? I enclose my presentation of the equipment, and

You have installed and reinstalled the RAM sticks and end up with the same results each time.

By the process of elimination, the RAM is faulty, or you bought by mistake 8GB instead of 16. (Or the seller has sent you the wrong amount of RAM, which is a real possibility...) In any case, you would better check your receipts, then (if necessary) call the seller to tell them there is an error. Many suppliers have a no questions asked return policy for a few days or a few weeks after the purchase.

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