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Devilstation said:
Looks like there is a simple way to see if you have the 65nm chips in the PS3.

My guess is that 3= still got 90nm chips in it, as these would require more power.

The 3rd prong is for gound, it has nothing to do with needing more power.

Here is an interesting article about it.

http://amasci.com/amateur/whygnd.html