There actually exists an insane project by some madmen that implements a modern OoO 68k-compatible core. It has a typical IPC north of 3! (compared to a real 68k, which is lucky to have an IPC of 0.3 on a good day). It is truly a work of marvel!
afaics this is used in Amiga accelerator cards and doubles the performance of an Amiga A4000 which ran at 25MHz. So nothing we'd really consider modern.
this is a proprietary FPGA design. The effective performance is limited by FPGA technology for now. Maybe additionnal design work would be required for an ASIC targeting latest foundry nodes.
http://www.apollo-core.com/index.htm?page=features