I prefer to get the exact match - but as long as they have the same settings you should be good to go. You want to make sure they have the exact settings for optimal performance. If the ADATA exact match is close to the same price (i.e. the Adata is $40 and you find another brand for $35), I would buy the Adata brand. If you can't find Adata, or there is a huge price difference, either buy two sticks of the new RAM or mix them.