Well I got it and put it in. It was pretty straightforward. Sims with the latest add-on packs loads the main menu in less than 60 seconds, and the neighborhood loads also in less than 60 seconds (VERY fast), and the FPS over that neighborhood was very smooth.
Also tried it out in Aces High briefly. Sitting in the tower at a field with 6+ fires raging, I noticed higher FPS than I normally get. Will have to wait for an actual sortie to see for sure.
Slight problem, though:
I started up first time and noticed BIOS listed it as 2.13GHz, not to be confused with the name the chip has associated with it, which has the suffix "@ 2.13GHz" built into it, but in the actual speed area it said 2.13GHz.
However, going into WinXP it lists it as 2.05. I double checked BIOS, it lists it as 2133MHz.
So I went back into XP and fired up CPU-Z.

Can anybody help me here? What's causing this to happen?