16 Intel Server Board SE7501BR2 Product Guide
Segment C: 64-bit / 100 MHz PCI-X Capable Subsystem
The 64-bit/100 MHz PCI-X segment includes:
• Two 3.3 V keyed full-length, full height PCI expansion slots that can support PCI-X add in
cards up to 133 MHz (PCI-X Slots1 and 2). These slots are backward compatible to 64-bit/100
MHz, 64-bit/66 MHz, 64-bit/33 MHz, and universal keyed 32-bit/33 MHz PCI cards.
The PCI-X features include:
• Bus speed up to 133 MHz
• 3.3 V signaling environment
• Burst transfers up to a peak of 1000 Megabytes per second (MB/s)
• 8-, 16-, 32-, or 64- bit data transfers
• Plug-and-Play ready
• Parity enabled
✏
NOTES
Speed on the PCI-X will be programmed by the BIOS according to loading on the
segment. When a segment is configured with a single PCI-X 64/133 card the bus
will work at 133 MHz; with two PCI-X 64/133 cards the bus will work at 100
MHz.
If you install a slower card into one of the PCI-X 64/100 connectors, the bus speed
for both connectors will be lowered to the speed of the slowest adapter.
Segment B: 64-bit / 100 MHz PCI-X Capable Subsystem
The 64-bit/100 MHz PCI-X segment includes the following embedded device and connectors:
• Two 3.3 V keyed full-length, full height PCI expansion slots that can support PCI-X add in
cards running at 100 MHz (PCI-X Slots 3 and 4). These slots are backward compatible to 64-
bit/66 MHz, 64-bit/33 MHz and universal keyed 32-bit/33 MHz PCI cards.
• Integrated Adaptec AIC-7901 U320 Single Channel SCSI Controller
The PCI-X features include:
• Bus speed up to 100 MHz
• 3.3 V signaling environment
• Burst transfers up to a peak of 800 Megabytes per second (MB/s)
• 8-, 16-, 32-, or 64-bit data transfers
• Plug-and-Play ready
• Parity enabled
✏
NOTE
If you install a slower card into one of the PCI-X 64/100 connectors, the bus speed
for both connectors will be lowered to the speed of the slowest adapter.
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