Description 15
Memory
The Intel
®
Server Board SE7501BR2 contains four 184-pin DIMM sockets and provides support
for up to 8 GB of DDR266 memory. The memory subsystem provides dual memory bus
architecture; the memory on the board is partitioned into two banks of DDR DIMMs. DIMMs must
be installed in pairs, providing a 144-bit wide data path via two separate memory buses.
The server board supports up to four ECC DDR DIMMs that are compliant with the JEDEC
DDR266 specification. A wide range of DIMM sizes are supported, including:
• 128 MB
• 256 MB
• 512 MB
• 1 GB
• 2 GB
The minimum supported memory configuration is 256 MB, using two 128 MB DIMMs. The
maximum configurable memory size is 8 GB using four 2 GB DIMMs.
✏
NOTE
DIMMs must be installed in pairs and must be populated by bank starting
with DIMM 1A and 1B (contiguous sockets). Although the SE7501BR2
server board architecture allows the user to mix various sizes of DIMMs
between banks, DIMMs must be identical within the banks. For a list of
tested memory, see:
http://support.intel.com/support/motherboards/server/SE7501BR2
PCI I/O Subsystem
The SE7501BR2 server board provides three PCI bus segments:
• Segment C with two PCI-X 64-bit / 100 MHz slots (Slot 1 and 2)
3
• Segment B with two PCI-X 64-bit / 100 MHz slots (Slot 3 and 4)
4
• Segment A with two PCI 32-bit / 33 MHz slots (Slot 5 and 6)
The following table outlines the capabilities of each 64-bit bus segment. The least capable card
installed on that bus determines the bus mode/speed. In other words, the bus will run at the speed
of the slowest installed card.
Table 2. 64-bit PCI Segment Configuration
# of slots populated per segment Segment B (mode, speed) Segment C (mode, speed)
0 PCI-X, 100 MHz PCI-X, 133 MHz
1 PCI-X, 100 MHz PCI-X, 133 MHz
2 PCI-X, 100 MHz PCI-X, 100 MHz
3
This segment will operate at 133 MHz when only one slot is populated.
4
Modular RAID on Motherboard (M-ROMB) support is provided via Slot 4.
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