When we export inventory report from RME for a WS-CBS3020-HPQ.
We can see that speed for giga port is wrong : 9.535107
IOS version: Cisco IOS Software, CBS30X0 Software (CBS30X0-LANBASE-M), Version
12.2(25)SEF1, RELEASE SOFTWARE (fc3)
This is a known issue with ifSpeed being treated as a power of 2 instead of 10. It is fixed in LMS 3.2. In the meantime, if you multiple the value by 1024, you will get the proper speed in bits per second.