the wii us gflops are just estimated. its impossible to give accurate numbers but it should be something between 350 and 450 gflops.
intel hd 4400
http://www.heise.de/newsticker/meldung/Intels-Broadwell-Grafik-Schneller-und-effizienter-Angriff-auf-AMD-2390225.html
website is german though.
"HD Graphics 4400 hat nur 20 EUs, die aber mit 1100 MHz laufen und 352 GFlops packen – allerdings liegt dessen TDP bei 15 Watt."
The wikipedia thing is meant to all the gpus, the most powerfull is 432 gflops. not the 4400