The low transistor count of the 386 and 486 would allow this chip to run optimally under 5 milliwatt at 65nm or less, using near-threshold voltage, and a combination of low-leakage process nodes, such as Global Foundries 22nm-FDSOI, TSMC ULL, and Intel's 16nm FinFet. https://hackaday.io/project/177716-the-femtotx-motherboard-standard