Here are the Elgato 4K S System Requirements.
Using 4K S in recording and streaming software other than Elgato Studio, such as OBS Studio, XSplit, StreamLabs Desktop, and others, will have different system requirements.
A processor with a suffix like "U" (Ultra-low voltage) or "M" is not recommended since it will have significantly lower performance. For example, the i7-4510U might seem powerful, but the U suffix indicates that it performs much less than other i7 processors.
Intel Pentium and Celeron processors do not meet the minimum specifications.
If you are unsure if your computer meets these system requirements or have further questions, please contact Elgato support by going to http://e.lga.to/help.