My PC has i9-9900x processor and motherboard with X299 chipset and socket lga2066. I heard about the next Intel i9-10980XE processor 10th generation processor that uses the X299 chipset and socket lga2066.
Does that mean I can upgrade my processor to this 10th generation processor?
Thanks for the question. Looking at the Intel Core i9-10980XE Extreme Edition, it is part of the Skylake architecture and uses the LGA2066 platform as you mentioned above, so in short yes you can upgrade your current CPU to the new 10th generation Cascade Lake-X chips.
Comparing to your current 9900X, you will enjoy a significant boost in core count, but lose base frequency. In addition, you will likely miss out on the extra PCIe lanes by not upgrading to a new X Series motherboard, but the new platforms are still PCIe 3.0, so if you are happy with your current setup, then run with it.
Another thing to watch out for is TDP as you may need to upgrade your cooling when you move to the 10980XE with its 165W design.