Chosen Solution

Is this RAM compatible and/or is there any reason I should not buy it?

It’s probably suitable, code includes a 1066 which is most probably the speed in Mhz. However, I agree with @a_i_takeover ..why bother buying from a source that hides infos on what they’re selling when you can buy a suitable upgrade from a more clear and reliable source ? —————— It seems site isn’t holding back any info, after you included the link with description that it’s clear.. yes, that’s a suitable RAM upgrade for your Mac. Picture description by itself could be improved though.

Err im not sure based on the description the website gave you. This ram will work for you though: https://www.amazon.com/Corsair-CMSA8GX3M