02-23-2019 05:27 AM
Thinkpad X1 Extreme Platform Specifications:
On the above link, Lenove states this device only supports 5120X2880@30Hz on DP output of Thunderbolt 3 port, which indicates each Thunderbolt 3 port of this device supports only 2 PCI-E lanes.
But on the other hand, there are some articles claims that X1 Extreme supports 4 PCI-E lanes on each Thunderbolt 3 port.
Which is true?
02-23-2019 05:39 AM
Please look here:
"On the left edge is Lenovo's proprietary charger next to two Thunderbolt 3 ports with 4x lanes of PCIe each for optimal performance."
02-23-2019 05:49 AM
But if then, why Lenovo claims that only up to 5120X2880@30Hz is supported on the specification? With 4 PCI-E lanes on each port, it should support 5120X2880@60Hz.
02-23-2019 03:35 PM - edited 02-23-2019 06:10 PM
PCI-e and DP are carried independently by Thunderbolt 3. Number of (up to 4) PCI-e lanes won’t determine number of (up to 2) DP streams (2x 4 DP lanes).