Unlike graphine, Silicon can overlap when used as wiring. Thus, Silicon is perfect for the powder toy because it's able to overlap itself without interfering with other electronics. Depending on how it's placed, the wiring can make simple lazers to giant calculators and computers even faster and with less wiring and confusion... not that the brainiacs who make such saves get confused. 

Silicon wiring will juts make things easier and more stable, along with more powerful and faster.