Not really overclocked
Actually, they are not really overclocked. Those are special parts that we created (mainly) for the financial industry.
The AMD Opteron 4100 Series processors are designed mainly for web/cloud where low power is the key. We created a special part with a higher TDP specifically for these types of customer needs.
Penguin did a great job of identifying the types of customers where this makes sense and is targeting that solution specifically to them. But the clocks are all stock, nothing is overclocked. That means full warranty, no worry about early silicon death because of too much juice.