Originally, the belief was that you could just check to see which CPU your 600X originally shipped with: if it shipped with a PIII 650MHz, then it supported SpeedStep, otherwise it didn't. However, there have been scattered reports of other models appearing to support SpeedStep CPUs even though they originally shipped with a PIII 500MHz.
It is safe to say that ANY 600X that originall shipped with a PIII 650MHz will support SpeedStep, since the PIII 650MHz was only ever released as a SpeedStep CPU in the MMC-2 form factor. This includes:
as well as possibly others.
The following models shipped with a PIII 500MHz, and I am not sure how to determine whether or not these models will support SpeedStep without actually inserting a SpeedStep CPU and giving it a try:
The following model originally shipped with a PIII 500MHz, but for some reason it appears separate from the other PIII 500MHz models and alongside the PIII 650MHz models in the IBM/Lenovo documentation, and some people believe that it therefore shipped with a motherboard that supports SpeedStep:
But as I said at the outset, I don't think that these lists can be used to get a definitive answer on SpeedStep compatibility.
For some additional information, check out:
ThinkPad 600X System Boards
Nostalgic for: 600X PIII 850MHz in a SelectaDock III with 64MB Voodoo 5 5500 and Sound Blaster Audigy 5.1.
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