I have two PC of about 7 or 8 years of age for me to experiments, sometimes risky, hardware and network and I wanted to inflate cheap parsimonious memory. They require this type of memory, up to 3 modules. I found that Amazon's offering yet, probably on end of stock, and there will surely be soon at all. The descriptions and other notices that I could find invited to be wary because of compatibility issues. 15 But the pair, why not? So I have ordered a pair and, after successful test, two more. This is not Peru, but it works!