Possible to Overclock "Regor" Over 4.0GHZ?

RaF187

Reputable
Dec 18, 2014
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4,520
MOBO: ASUSTeK M5A78L - MLX PLUS
CPU: AMD Athlon II X 260 (Regor) Standard: 3.2GHZ

Looking Online, I have found people who have Overclocked there Regor to 4.5-5GHZ?!?!
How is this Possible?
When I set the HT Reference to 250, I get 4.0 GHZ.
When I set the HT Reference any Higher, the system Restarts upon loading Windows.
I have a Noctua Cooler, so Temp. is no Issue.
Do I have to Overvolt? How do I do such a thing.