Bought a couple of Dell Vostro 5890 for my office and planned on upgrading the ram. I installed 2 sticks of Corsair and everything went well for the first 6 months. Dell pushed a bios update to me in April and after that it would not boot. It was giving me a code for invalid memory module. So apparently in this bios update it put corsair on its naughty list of components. It checks the first slot for approved memory, most likely the one they have a contract with, and if it isn't that brand, it will not post. I hate companies like this. It is literally the last thing I will ever buy from Dell.