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If you choose to upgrade, proceed with caution. I would highly suggest that you check with Fujitsu* first to see what the processor (CPU) upgrade options are (if any) for your particular laptop model. At a minimum, there are possible BIOS considerations (microcode update may be needed) and thermal considerations (max temp issues) depending which CPU you wish to install. I would imagine that Fujitsu has a tested (validated) CPU list for each of their laptop models. Upgrading parts in your laptop that are not recommended by your system manufacturer may void the warranty.
The Merom-based, Intel® Core™2 Duo Processor T5800 is rated at 85°C max. temp. There are many other Merom-based, Intel® Core™2 Duo Processors.
The following product comparison list comes from ark.intel.com: http://ark.intel.com/Compare.aspx?ids=29760,31728,29759,37034,35581,29761,29762,31729, The list is not a "compatibility" list for your particular laptop model, but it is a general comparison of Intel processors like the Intel® Core™2 Duo Processor T5800 that you are inquiring about. As you will notice, all of the other CPUs in the list - with the exception of the T5800 - are rated at 100°C max. temp.
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*Other names and brands may be claimed as the property of others.