Hi,
this is telling you that the Dimms ( Memory Sticks ) Have to be the same or equivalent.
i.e:- 2 x 256mb. 2 x 512mb. Your system does,nt seem to like 1 stick of 128mb And 1 stick of 256mb. et,c.
each channel has to have the same amount of memory. put the same memory in slots 1 and 2 on the motherboard, or if there are 4 slots. put the same memory modules in slots 1-2 3 and 4.
If this does,nt work, use the same memory in slots 1 and 3. or 2 and 4 respectively.
Mike @ Compurepair.
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Memory configurations
You can install 128 MB, 256 MB, 512 MB, and 1GB DDR SDRAM DIMMs into the DIMM sockets using the memory configurations in this section.
• Install only identical (the same type and size) DDR DIMM pairs
using the recommended configurations.
• Make sure that the memory frequency matches the CPU FSB
(Front Side Bus). Refer to the Memory frequency/CPU FSB
synchronization table on the next page.
• This motherboard does not support double-sided 16-bit DDR DIMMs.
• Do not create a three-DIMM configuration in dual-channel mode. The
third DIMM is ignored in the dual-channel operation.
Recommended memory configurations
Memory frequency/CPU FSB synchronization
* Use only identical DDR DIMM pairs.
Sockets
Mode DIMM1 DIMM2 DIMM3 DIMM4
Single-channel (1) Installed - - -
(2) - Installed - -
(3) - - Installed -
(4) - - - Installed
Dual-channel* (1) Installed - Installed -
(2) - Installed - Installed
(3) Installed Installed Installed Installed
CPU FSB DDR DIMM Type Memory Frequency
800 MHz PC3200 400 MHz
533 MHz PC3200/PC2700 400/333 MHz
This motherboard can support up to 2Gb of DDR266 RAM modules.
Attached is part of the memory detail from the manual.
If you need a copy of the manual. please click on this link to download :-
ftp://serwery.optimus.pl/Servers/Motherboards/SE7501BR2/Dokumenty/se7501br2tps.pdf
3.1.2.2 Memory Configuration
Memory interface between the MCH and DIMMs is 144 bits wide. This requires that two DIMMs
be populated per bank in order for the system to operate. At least one bank has to be populated
in order for the system to boot. If additional banks have less than two DIMMs, the memory for
that bank(s) will not be available to the system.
There are two banks of DIMMs, labeled Bank1 and Bank2. Bank1 contains DIMM locations
DIMM1A and DIMM1B and Bank2 contains DIMM2A and DIMM2B. DIMM socket identifiers are
marked with silk screen next to each DIMM socket on the baseboard. The sockets associated
with any given bank are located next to each other.
The baseboard's signal integrity is optimized when memory banks are populated in order.
Therefore, DIMM Bank1 must be populated before Bank2.
DIMM and memory configurations must adhere to the following:
• DDR266 DDR registered DIMM modules
• DIMM organization: x72 ECC
• Pin count: 184
• DIMM capacity: 128 MB, 256 MB, 512 MB, 1 GB, 2 GB
• Serial PD: JEDEC Rev 2.0
• Voltage options: 2.5 V (VDD/VDDQ)
• Interface: SSTL2
• Two DIMMs must be populated in a bank for a 144-bit wide memory data path
• One or two memory banks may be populated
Table 2. Memory Bank Labels
Memory DIMM Bank Row
J8D22 (DIMM 1A), J8D15 (DIMM 1B) 1 0, 1
J8D7 (DIMM 2A), J8D1 (DIMM 2B) 2 2, 3
Note: Memory must be installed in pairs; DIMM Bank1 must be populated before DIMM Bank2.
Memory within a DIMM bank must be identical; between banks only the DIMM size may be
different.
Functional Architecture Intel® Server Board SE7501BR2 Technical Product Specification
26 Revision 1.2
Intel Order Number C13977-003
Figure 3. Memory Bank Label Definition
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