so the name of the cpu can be wrong??
*SOME* of the E4400 and others are just E6xx0 Series with half the cache disabled and rebinned.
Originally this was the 6300 and 6400 series.
The 1.2 GHz is 6x200 (which is the stock FSB of the E4400). The Device Manager is probably reading it right, but isn't showing the right CPU as it was re-binned with half the cache disabled.
The "newer" and some of the older E4x00 series and E2xx0 Series are Allendale cores, which are Conroe logic with 2 MB Cache to begin with. If an actual Conroe with 4 MB Cache turns out with 2 MB of bad cache it is rebinned as E4x00 series and sold off.