RAM capacity question

Hello and thanks in advance for your help.  The Apple webpage on installing RAM for the MacBookPro4,1 gives conflicting info: In one place it says, "You can add two 4 GB memory mods for a max of 8 GB".  In another place it says "4 GB is the max that can be recognized".  So which is it… 4 GB or 8GB?

I had a similar doubt few years ago with a MacBookPro which according to Apple could only use 3 GB.
There was a little confusion at those times, some MBP could really use 4 and I was tempted to try.
I tried to install 4 (2+2) and they were apparently seen as installed under System Preferences Info/Memory...4GB.
BUT:   I went under Activity Monitor: under Sistem Memory you get the real status with a pie chart about RAM, Installed used and free, and the addition of used and free gave only 3GB. So the extra 1 GB was installed but not used.
My advice is if you whish to try to get more than Apple suggests find a way to test your RAM with Activity Monitor at the shop where you do buy the RAM and agrre with them before, to buy only if they are seen.
To be clear: I am not to say the suggestion from wjosten about 6GB could be wrong.
Just adding a way to check the real status of the installed RAM:  may be you can put more RAM  into the slots than officially allowed and believe you have it installed, until you go to Activity Monitor.

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