Acer Aspire 7720-4428 / 7720z model:ick70 MAXIMUM RAM?

I know that it's an old laptop. It's for Grandma guys! I am just trying not to add on to this gigantic pile of trash we create everyday. She only opens an email with it, ok? Large screen, large letters etc.
Anyway, anyone was able to upgrade this model to 4GB RAM? I see some websites selling up to 8GB ram for this machine. At the same time Acer specs and others claim that 2GB RAM is max. Acer has really poor support site, no documentation - bare bones...
Here are some other spec: Intel Pentium dual-core processor T2310; 1,46 GHz, 533 MHz FSB, 1MB L2 cache
Thanks for help!

 

This notebook uses Intel PM965 chipset which supports 4 GB RAM max (DDR2 533 or 667 MHz) so 4 GB RAM should work (although most likely only as 2 x 2GB) and 8 GB won't work.