Currently, the 75% yielding boost doesn't work on iMac. The resource yielding speed-up on the new shaman gear doesn't work either. 

I wonder if anything of that fancy shiny gear actually works but I'm done trying things out. Why don't you guys at Plarium find out by yourself. Takes just a few minutes. I'm bored doing your homework. Make something that functions before putting it online. It's called playtesting, and every serious gaming company does it.