Libreboot: CPU upgrade

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delaforce
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Joined: 05/18/2014

Would someone kind enough to clarify me cpu upgrades in 3 libreboot laptops: X60S (with S, it´s my model) , X200 and T400.
I suppose that X200 and T400 can be upgrade to Intel® Core2 Duo Processor T9000 Series and no better options. In that case the best option is T9900,init ?
Any problem with microcode or anything ?

https://www.intel.com/content/dam/support/us/en/documents/processors/core2duo/sb/core_T9000.pdf

Thank you very much.