Hi Twsteffen,
So it sounds like you are talking about IBM Bladecenter with Virtual Fabric adapter or VFA. Please let me know if its not a VFA(II) adapter. But if it is, I think you are seeing the maximum of the vNIC because the phyiscal port can go up to 10Gb. In my opinion it be nice if it displayed the bandwidth set from a switch independent or virtual fabric mode. Each physical 10GbE port will present 4 vNICs to the OS. Since we have two ports you see 8 vNICs. The bandwidth for each vNIC can be configured in increments of 100Mb up to a maximum bandwith of the physical port. The vNICs on a given physical port share the 10Gb bandwidth port.
Maybe this guide can help. Starting on page 22 it talks about the architecture .
Alex