A trawl through various datasheets showed that the FS726T would be a good candidate for providing 24 port of Ethernet for a reasonable power budget.
It is quoted at 13W consumption.
Results:
- No-connection load was measured at 8W.
- 8 WebBricks connected 8W
- 10 connections + broadcast storm 10W (The storm was to give the switch some work to do)
Conclusion - a pretty good result from the Netgear switch.