This model was manufactured for several years with different clock speeds. The earliest D630s were 1.8GHz, gradually increased to 2.0, 2.2 and finally 2.5. I've run both the 2.0 and 2.5GHz versions and there is a noticeable difference in performance.
Worked like a charm, 20 minutes start to finish. Pure luck, none of the glue put up much of a fight. One suggestion: when removing the bottom of the case, the clips are very delicate. They may fold in but not break. When you replace the back cover, those folded tabs will wedge between and keep the cover from going all the way back on. I cleaned them all the way off and everything fit flush again. Also, when fitting the new battery the daughterboard cable gets in the way of pre-plugging the battery connector. Tuck the battery under the daughterboard, then plug in the battery cable before pressing the battery into its spot. All the cables will behave then.