Why does my Task Manager show i have 4 open RAM slots? — Acer ...
You don't. Its likely the chipset which is common to other designs supports 4 ram slots. There's only 2 physical ram slots its entirely possible to use the same chipset for 4 sticks.
Use the SD and SDXC card slot on your Mac - Apple Support
If you own MacBook Pro and want to upgrade the RAM on this machine, you should know that only a few models have slots for additional RAM. These are ...
ASUS E210MA | SSD Upgrades | crucial.com
Find compatible upgrades and system info for ASUS E210MA. Discover RAM and SSD compatibility, slots, and max capacity.