Gigabyte GA-7A8DRH User Manual page 39

3) JP4 (PCI-X Bus Speedy Function)
4) JP7 (PCI-X Bus Speedy Function)
1
1-2 close: Enable PCI-X 3 & 4 and SCSI at
100 Mhz (default)
1
2-3 close: Enable PCI-X 3 & 4 and SCSI
at 133 Mhz
1 1-2 close: Enable PCI-X 1&2 and 545GM
100 Mhz (default)
1
2-3 close:Enable PCI-X 1 & 2 and 545GM
133 Mhz
3 9
Jumper Setting