GPU-Z showing different PCI-E numbers under load?

[leonidas19203]

I noticed that on GPUZ the PCI E number changes when the GPU(GT 730) goes under load. In this example, it went from PCI 1.1 to PCI 2.0. Im quite curious as to what this is supposed to mean

 

[rgd1101]

it mean it saving power.

 

[leonidas19203]

Cool