Linux
Linux
your dell dimension e310 runs a 64-bit intel pentium 4 processor with hyperthreading. it has 1gb of ram and supports apache2 for hosting your website. a lightweight linux distribution should work well on this machine.
I completely understand your perspective. The Pentium 4s consume a lot of power and generate excessive heat, making them less cost-effective. However, if you're planning to use them solely as servers, you might find CentOS 7 Minimal Package or Ubuntu Server suitable options. These choices are likely to meet your requirements without the added expense of electricity bills.