The X5687 is not supported on the Intel 5520 chipset, nor is it listed anywhere (that I could find) as being supported on the T610. Page 26 of the T610's Technical Guide shows that the X5677 (3.46GHz - corrected) is the highest speed processor supported in the T610. It says see Dell.com for updates ... there exists no newer update, so I would imagine that nothing has changed (and the Technical Guide is dated December 2012):
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