From the link:

> At that point Windows XP 32-bit was the most commonly used variant, and while you could run XP 64-bit (and IBM did have native support for it on the IntelliStation 9228), XP 64-bit had so many problems so most users were stuck with 3.9 GB of RAM. Therefore if we were to assume that UNIX and said UNIX hardware offered way more memory, it starts to make sense