Summary: I had a laptop that misbehaved badly. After an extensive runaround from the hardware vendor and a problem with software support, I found a good set of test programs on the Internet. One of my two memory modules died after 4 years of service. I have used PNY memory before, and purchased this module as a replacement. It is working well and, after a bit of software mashing, the laptop is now functioning. Good part, good price.