This RAM is a must for someone who is upgrading or repairing an older desktop computer. I have an old PC that had 512MB of RAM before, I got this for an upgrade so It would run faster. It's all recognized in by the CPU as it reports that it's there in the BIOS.Another thing is the seller is quick to respond to customer service; I had checked the tracking info and it was stated as delivered. Since I had not noticed the delivery of this package and when I called the post office they did not have it, I quickly contacted the company asking what they could do if the package was taken from my porch. They responded fast (less than 12 hours) and stated their replacement options. Luckily I found the RAM in my mailbox so I didn't have to go any further than the email.