The AMD Athlon II X2 240e is similar to the X2 250 but that little ‘e’ on the end signifies it to belong to the Regor family of 45W TDP processors.  It will support DDR2 or DDR3, depending on which socket motherboard you choose at up to 1333MHz.  From the results of their testing PC Stats decided that this efficient $80 processor is great for small systems but really does compete against the 250 which might eat up $10 more and produce 10W more power but does also offer you a 5-7% gain in performance.

“Do you leave your computer on all the time? If you’ve nodded yes to any of the above, it might be time to think about a more power-efficient processor. That’s the idea behind AMD’s Athlon II X2 240e. It’s a 2.8GHz dual-core processor based on the AMD “Regor” core with a TDP of just 45W. The “e” behind the Athlon II X2 240e model name indicates that it’s one of AMDs Energy Efficient processors. The Athlon II X2 240e has support for both DDR2 and DDR3 memory, depending on if the processor is dropped into a socket AM2+ or socket AM3 motherboard. Memory can be run at speeds of DDR2-1066 or DDR3-1333 via the Athlon II X2 240e’s integrated memory controller.”

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