Question MSI G41M-P28 ram limit

Mar 6, 2019
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I've had this motherboard since around 2010-11 now, and im still using it. Im looking up for upgrading the specs a little bit until i buy a new PC in near future. On the box that came with it says that its ram limit is 4 gigs while on official internet page is 8. Now im stuck in between and don't know how much i can have. I'd love to upgrade it up to 8 gigs. Thanks in advance.
 
I have bought one more 2gb ddr3 1333mhz stick 3 years ago so i could i have 4 gigs, but it didn't work it added only like 100mbs of ram, whats up with that? I tried changing slots and updating bios back then but nothing worked..