Ok, so here's the situation. I'm looking to upgrade my prebuilt computer. I got it a few years back, so it has an AM2 mobo with a 65 watt TDP max. I have found a 65w AMD Phenom x2 905e, but it has an am3 socket. I know that an am3 CPU will physically fit into an Am2 socket, but will it work?
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No you can't.
905e is pretty slow anyway (low power) so it wouldn't likely be much faster anyway.
But I have heard people that have gotten an AM3 processor to work on an AM2 mobo before, even over the max TDP, with a bios update. How can you be so sure?