Is this CPU upgrade Possible?

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Does anyone know if a Toshiba A305-S6858 (which comes with a Merom T5750
Core 2 Duo CPU) could take a Penryn T9300 or T9500 Core 2 Duo CPU as an
upgrade?  The chipset in the A305 is a GM965 Express.

Alternatively, I presume that one could upgrade the T5750 to a T5900.

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