Corsair is well known for quality products and these modules are no exception. I believe the extra heat dissipation makes a big difference in performance, and these modules have worked flawlessly for months now. I'm very happy with this upgrade, and the value from Overstock.
I have used Crucial memory for upgrade multiple times and have yet to experience a problem. 'O' typically has the best price (if you can catch the deals as they fly in and out) and, again, never a problem. I have bought this particular memory set for two ***** and installation is easy and works without great - even under high temperature conditions (that I do not recommend, however).
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