1000xf bus problem

[Greg.Chandler]

I'm running a e1000xf adapter in a 64-bit/100Mhz PCI slot.  The intel
site shows this is a supported config for the card, but linux is pulling
this info:

ed:02.0 Ethernet controller: Intel Corporation 82544EI Gigabit Ethernet
Controller (Fiber) (rev 02)
	Subsystem: Intel Corporation PRO/1000 XF Server Adapter
	Flags: bus master, 66Mhz, medium devsel, latency 64, IRQ 18
	Memory at f7fe0000 (64-bit, non-prefetchable) [size=128K]
      Memory at f7fc0000 (64-bit, non-prefetchable) [size=128K]
      I/O ports at 7000 [size=32]
      [virtual] Expansion ROM at f10a0000 [disabled] [size=128K]
      Capabilities: [dc] Power Management version 2
      Capabilities: [e4] PCI-X non-bridge device
      Capabilities: [f0] Message Signalled Interrupts: 64bit+ Queue=0/0
Enable-

My thoughput tests show it is definitely not running at the 100Mhz bus
rate is should be capable of.
Any ideas on how to make it work at full speed?
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