It looks like the customizable variant of the P1 Gen 2 has different GPU options (including iGPU-only) based on what processor you choose, while the X1 Extreme Gen 2 has a Geforce 1650 in all configurations.
If I had known that when I was picking out an X1 for work, I would have pushed a P1 with no dedicated GPU instead.
If I had known that when I was picking out an X1 for work, I would have pushed a P1 with no dedicated GPU instead.