x1 vs x8 10gb performance...

I'm testing throughput of a D-1500-based X552 and a X520, and according to lspci their PCIe lane configuration is as follows:

admin@capture:~$ sudo lspci -vv | grep -P "[0-9a-f]{2}:[0-9a-f]{2}\.[0-9a-f]|LnkSta:" |grep -A 1 Ethernet

04:00.0 Ethernet controller: Intel Corporation Ethernet Connection X552 10 GbE SFP+

        LnkSta:    Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-

04:00.1 Ethernet controller: Intel Corporation Ethernet Connection X552 10 GbE SFP+

        LnkSta:    Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-

06:00.0 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)

        LnkSta:    Speed 5GT/s, Width x8, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-

06:00.1 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)

        LnkSta:    Speed 5GT/s, Width x8, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-

However, I'm getting the exact same numbers for each. It doesn't make sense that the X552 would only get 1 lane.

Is what lspci is telling me wrong?

Thanks.