The D945GTPLR motherboard has an onboard e100 10/100Mb ethernet interface using Intel 82801G and 82562GZ chips.

[root@localhost ~]# lspci -vv
...
07:08.0 Ethernet controller: Intel Corporation 82801G (ICH7 Family) LAN Controller (rev 01)
        Subsystem: Intel Corporation: Unknown device 308d
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B-
        Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
        Latency: 32 (2000ns min, 14000ns max), Cache Line Size 10
        Interrupt: pin A routed to IRQ 98
        Region 0: Memory at 50004000 (32-bit, non-prefetchable) [size=4K]
        Region 1: I/O ports at 1000 [size=64]
        Capabilities: [dc] Power Management version 2
                Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
                Status: D0 PME-Enable- DSel=0 DScale=2 PME-
...
                
[root@localhost ~]# lspci -vn
...                
07:08.0 Class 0200: 8086:27dc (rev 01)
        Subsystem: 8086:308d
...

When initially attempting to install FC4 the kernel didn't recognise the e100 interface, I discovered that the Unofficial FC4.1 built and distributed by Hans K. Rosbach were new enough to recognise it, I could then use yum to update the rest of the system to the latest patches.

Other configurations of the D945GTP have 10/100 ethernet using the 82562GX chip or 10/100/1000Mb ethernet using 82573E/82573V/82574V chips