Could you provide a log from the server? Or at least a description of what happened when you set the generator above 32512 EU/t? Also, the version of Minecraft, and the mod list with could be helpful.
Hey so the error is that the output becomes negative. Then a blue screen, then an error that has this log: http://pastebin.com/4ep43XFZ
It turns out that it is not exactly 3512 eu/t but it is very close.