When Vista came out I bought a new machine with AMD A6 4600+ and 2GB of RAM with Vista 64bit and it ran great. I had no driver issues or performance issue even with default install. You didn't need 4GB of RAM, you just needed new hardware. Limited RAM and drivers for the older hardware were the biggest problems, Microsoft drastically changed the driver DDK and many hardware venders had poor quality or no drivers which led to many of the problems people had. Kinda sad I got rid of this machine, it would be interesting to benchmark it to a Raspberry PI 4 in Linux.