I could not find an i7-6820hv. I did do a compare of these three:
If you are thinking of upgrading your laptop, you can stop now. All three of the above processors use a BGA socket, which means the processor is soldered to the motherboard.
If you are looking to purchase a laptop with one of these processors, all three offer VT-x, VT-D, and VT-x with EPT. And, all three are in the same price range.
Make sure you check the box "Highlight Differences". Makes it easier to read.
If important to you, the U and HQ offer vPro.