Here are the specs for an Abit AN8: I think it does support 1000mhz transport, but it is a non ultra n-force 4 chipset.
Supported CPU: AMD Athlon 64/64FX 939-pin K8 CPU
Chipset: NVIDIA NF4 single chip
FSB: 2000MHz
RAM: 4x 184-pin DIMM for Dual channel DDR 400/333/266 (Max. 4GB)
IDE: 2x Ultra ATA 133 up to 4 Devices
Slots: 1x PCI-E X16, 2x PCI-E X1, 3x PCI, 1x Abit Audio Slot
Ports: 2x PS/2, 1x IEEE1394a, SPDIF In/Out, 10x USB2.0(Rear 4), 1x LAN, Audio Ports
Onboard Audio: 6 Channel Audio
Onboard LAN: Gigabit Ethernet
Onboard 1394: 2x IEEE1394a(Rear 1)
Onboard SATA/RAID: 4x SATA150, RAID 0/1/0+1 JBOD
Form Factor: ATX
So confused, but it means it is just another day.