• A Core i7 8550u (4 cores, turbo boost up to 4GHz)[1]
• 2 DDR4 SODIMM slots. I put 32 GB of RAM in.
• 2x mini PCI Express slots. There's an 802.11/Bluetooth card in one. The other is empty but could be used for LTE.
• An M.2 NVMe slot. I put a 2TB SSD in it.
• An upgraded screen (2880x1920, 450 nits, wide gamut). The bezel is cut to make room for the 3:2 aspect ratio, sacrificing the webcam.[2]
I have small hands so I slightly prefer the X62's keyboard, but everything else is much better on the X210.
1. https://ark.intel.com/products/122589/Intel-Core-i7-8550U-Pr...