I've got the same card (this one is on a PCI-Express 1x desktop card) and I just did a fresh install.
Which pfSense build?
2.0.1-RELEASE (amd64)
built on Mon Dec 12 18:16:13 EST 2011
FreeBSD 8.1-RELEASE-p6
The card didn't seem to have been recognized, it's not available to use as an interface.
Where did you look?
Interface => Assign
Please provide the output of pfSense shell command
pciconf -lv
so we can see the device identification details.
$ pciconf -lv
hostb0@pci0:0:0:0: class=0x060000 card=0x200d8086 chip=0x01008086 rev=0x09 hdr=0x00
class = bridge
subclass = HOST-PCI
pcib1@pci0:0:1:0: class=0x060400 card=0x200d8086 chip=0x01018086 rev=0x09 hdr=0x01
class = bridge
subclass = PCI-PCI
vgapci0@pci0:0:2:0: class=0x030000 card=0x200d8086 chip=0x01028086 rev=0x09 hdr=0x00
class = display
subclass = VGA
none0@pci0:0:22:0: class=0x078000 card=0x200d8086 chip=0x1c3a8086 rev=0x04 hdr=0x00
class = simple comms
em0@pci0:0:25:0: class=0x020000 card=0x200d8086 chip=0x15038086 rev=0x05 hdr=0x00
class = network
subclass = ethernet
ehci0@pci0:0:26:0: class=0x0c0320 card=0x200d8086 chip=0x1c2d8086 rev=0x05 hdr=0x00
class = serial bus
subclass = USB
pcib2@pci0:0:28:0: class=0x060400 card=0x200d8086 chip=0x1c108086 rev=0xb5 hdr=0x01
class = bridge
subclass = PCI-PCI
pcib4@pci0:0:28:2: class=0x060400 card=0x200d8086 chip=0x1c148086 rev=0xb5 hdr=0x01
class = bridge
subclass = PCI-PCI
pcib5@pci0:0:28:4: class=0x060400 card=0x200d8086 chip=0x1c188086 rev=0xb5 hdr=0x01
class = bridge
subclass = PCI-PCI
ehci1@pci0:0:29:0: class=0x0c0320 card=0x200d8086 chip=0x1c268086 rev=0x05 hdr=0x00
class = serial bus
subclass = USB
isab0@pci0:0:31:0: class=0x060100 card=0x200d8086 chip=0x1c5c8086 rev=0x05 hdr=0x00
class = bridge
subclass = PCI-ISA
atapci0@pci0:0:31:2: class=0x010601 card=0x200d8086 chip=0x1c028086 rev=0x05 hdr=0x00
class = mass storage
subclass = SATA
none1@pci0:0:31:3: class=0x0c0500 card=0x200d8086 chip=0x1c228086 rev=0x05 hdr=0x00
class = serial bus
subclass = SMBus
igb0@pci0:1:0:0: class=0x020000 card=0x12a18086 chip=0x150e8086 rev=0x01 hdr=0x00
class = network
subclass = ethernet
igb1@pci0:1:0:1: class=0x020000 card=0x12a18086 chip=0x150e8086 rev=0x01 hdr=0x00
class = network
subclass = ethernet
igb2@pci0:1:0:2: class=0x020000 card=0x12a18086 chip=0x150e8086 rev=0x01 hdr=0x00
class = network
subclass = ethernet
igb3@pci0:1:0:3: class=0x020000 card=0x12a18086 chip=0x150e8086 rev=0x01 hdr=0x00
class = network
subclass = ethernet
pcib3@pci0:2:0:0: class=0x060401 card=0x200d8086 chip=0x88921283 rev=0x30 hdr=0x01
class = bridge
subclass = PCI-PCI
none2@pci0:4:0:0: class=0x028000 card=0x13018086 chip=0x00828086 rev=0x34 hdr=0x00
class = network
em1@pci0:5:0:0: class=0x020000 card=0x10838086 chip=0x10b98086 rev=0x06 hdr=0x00
class = network
subclass = ethernet