I bought Corsair memory for my personal desktop to increase memory from 1.5gb to 2.0 gb. A friend, who works in the IT field, told me that all chips are produced by the same manufacturer, and thus, I should by the least expensive, which happened to be Corsair. Although my system booted after the installation, I saw little improvement in speed. However, the real problem was that my system would freeze - constantly - in any and all of my programs. Then it became an even bigger problem. My system began shutting down and restarting on its own while I was in the midst of doing work. As soon as I replaced the Corsair memory with the original, all problems ceased. I then returned the Corsair and and ordered PNY.