http://developer.intel.com/products/ethernet/resource.htm?s1=all&s2=82541PI&s3=Datasheet#s1=Gigabit%20Ethernet&s2=all&s3=all
e1000 network card model:
82540EM
82541PI
......
Small difference between 82540EM and 82541PI
1. The default internal buffer size is different
82540EM : 16KB
82541PI: 24 KB
2. 82540EM can configure MSI control register at PCI configuration space, but 82541PI is a read only register
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