Thanks for joining the processor community.
Based on the processor specifications for G1820TE, means the processor can handle the following:
1 slot of x16 speed
Or 2 slots of x8 speed
Or 1slot of x8 speed
Or 2 slots of x4 speed.
The configuration depends on the integration of the computer manufacturer.
Thank you for answering, I see the product information has been updated to show all three CPUs support multiple PCIe configurations as well.
Glad you got help in the forums.