The new Dell E6400 gives some troubles while trying to OSD it. The drivers provided by Dell does not work. You can import XP drivers but not Vista. SCCM WinPE is based on Vista so you’ll need Vista drivers. without drivers the system will boot to WinPE but then it will restart.

The correct drivers can be found on Intel website.
Download both 32 and 64 bit drivers.
Once downloaded extract PRO1000 folder from both files. I used WinRar for that.

Place these to folder somewhere where your SCCM server could access them and import them to SCCM. Yuo can read on importing drivers here. You don’t have to create driver package. The only thing you need is to add the drivers to Boot images and update distribution points.