OK, not to stir up any controversy here, but I have always bought pretty much the cheapest RAM I can, and over the past 20 years of upgrading Mac's, PC's, etc, I have yet to have a problem. Now, I am pretty careful to follow specs, so sites that don't make it simple to enter your computer make and model are a little more difficult, but I always feel better in the end anyway. And that's not to say that I don't know anyone that has had problems, but I haven't heard of many more problems from low-end vs. high-end vendors. Now, any particular stick might be defective, and you might have better luck exchanging a piece from a name-brand vendor. But you might not. And of course, precisely for the above reason, YMMV, but still, I wouldn't recommend paying much of a premium to buy RAM from a premium vendor. Just my 2ΒΆ.