I bought a 4 GHz FX-8350 last February (Groundhog Day in fact) to upgrade the existing 3 GHz Phenom-II-X4-945 4-core unit in my Linux workstation. What is intriguing is that since installing it I have not experienced the "burst-of-speed" I had been anticipating, moving from 4-cores @ 3.0 GHz to 8 cores @ 4.0 GHz--the technical details in the complaint explain this.
I'm going to submit a claim and see what happens...