JackE said:

Go to crucial dot com for memory specs on your system. https://www.crucial.com/usa/en/compatible-upgrade-for/Acer/aspire-7741g

Your system can support 8GB max as two 4GB DDR3 laptop modules of 1600MHz speed or greater, 1.35 volts. Jack E/NJ

Careful, I wouldn't trust that data.

Looking at the official spec sheet for the processor in there (or those of that era) while they do support a maximum of 8GB that's not the correct clock speed of the memory for them. They can run on DDR3 at 800 or 1066 MHz, Crucial may be recommending that because they may not manufacture lower things right now, or maybe they have it wrong.

While it's true that you can DDR3-1333 or DDR3-1600 in there most likely, they'll be running at a lower speed; so my recommendation is knowing the max. limit and knowing the max. clock speed (I looked at an i5 480M, check with Intel if your processor is different) buy whatever is cheaper for you.

Brand doesn't actually matter, as long as the memory is according to spec that's it. Same goes for those Mac branded sticks, it's BS, sometimes just a marketing gimmick, and sometimes it just means that they were tested in a make and validated so they know for sure it works.

But be it a Mac or a PC, look for whatever the processor / motherboard supports, buy whatever is cheap (or expensive if you're looking for performance) that adheres to those specs and you're gold.