214-dimm configuration warninig.populated DIMM confuguration is unbalanced .for maximum performance.place both DIMMs in the two black DIMM SLOTS

Just had same problem. Found a solution:
I have an old HP Compaq dc5000MT. It has 4 RAM slots
Here's what DIDN'T work:
1gb + 1gb + 512mb + 512mb
1gb + 512mb + 512mb + 1gb
512mb + 1gb + 1gb + 512mb
Here's what DID work:
1gb + 512mb + 1gb + 512mb
I'm sure that:
512mb + 1gb + 512mb + 1gb would probably work as well.
From my guess they're are 2 "channels" (slots 1&2 are channel 1, slots 3&4 are channel 2) and you have to keep the amount of RAM balanced on both slots and in the same order.
Another thing to note with the old XP OS. IT ONLY WORKS WITH 3GB or RAM. MAX. So 1 + 1 + 1 + 1 (4gb) WILL NOT WORK... PERIOD for XP. Vista, 7, 8 etc. allows you to use a ton more ram + readyboost. They need all the help they can get though since they are major resource hogs.

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

The board has two 240-pin DIMM sockets and supports the following memory features:

• 1.8 V (only) DDR2 SDRAM DIMMs with gold-plated contacts
• Unbuffered, single-sided or double-sided DIMMs with the following restriction: Double-sided DIMMs with x16 organization are not supported.
• 2 GB maximum total system memory
• Minimum total system memory: 128 MB
• Non-ECC DIMMs
• Serial Presence Detect
• DDR2 533 or DDR2 400 SDRAM DIMMs

Note
To be fully compliant with all applicable DDR SDRAM memory specifications, the board should be populated with DIMMs that support the Serial Presence Detect (SPD) data structure. This allows the BIOS to read the SPD data and program the chipset to accurately configure memory settings for optimum performance. If non-SPD memory is installed, the BIOS will attempt to correctly configure the memory settings, but performance and reliability may be impacted or the DIMMs may not function under the determined frequency.

HI,

The board has specific requirements for memory. Here's the Memory Configurations :

• You may install 256 MB. 512 MB and 1 GB unbuffered non-ECC DRR DIMMs into the DIMM sockets using the memory configurations in this section.

• Installing DDR DIMM. Other than the recommended configurations may cause memory sizing or system boot failure.

• In dual-channel configurations, install only Identical (the same type and size) DDR DIMM pairs for each channel.

• Always install DIMMs with the same CAS Latency. For optimum compatibility , It Is recommended that you obtain memory modules from the same vendor

• Double-sided x 16 modules are not supported on this motherboard.

• Due to chipset resource allocation, the system may detect less than 4 GB system memory when you installed four 1 GB memory modules.


For dual-channel configuration you may:

install identical DIMMs in all four sockets

• install identical DIMM pair in DIMM_A1 and DlMM_B1 (blue sockets) and identical DIMM pair in DIMM_A2 and DIMM_B2 (black sockets)

• install same size DIMMs in DIMM_A1 and DIMM_B1 (blue sockets) and another same size pair in DIMM_A2 aid DIMM_B2 (black sockets)

Hopefully this will help understand how to install the new memory.

Thanks Mark

Populating the memory according to the following guidelines resolves this POST error:

• DIMMs must be configured in identical pairs.
• The system will not boot properly if multiple DIMMs of varying density or type are installed in the system.
• The Entry model servers come with a single 512 MB DIMM. If additional DIMMs are to be added to the existing 512MB DIMM, then another 512 MB DIMM has to be added along with the new pair of DIMMs, or it has to be removed when adding the next pair.
• Valid DIMM pair combinations use slots 1/5 (Bank A), slots 2/6 (Bank B), slots 3/7 (Bank C), and slots 4/8 (Bank D).
• Up to 16 GB of memory are supported on the Dual-Core 5000, and 5100 series
• Up to 32 GB of memory are supported on the Dual-Core 5200 series, Quad-Core 5300, and 5400 series
• FBDIMMs must be installed in pairs unless operating in single-FBDIMM mode. The server supports single-FBDIMM mode only in FBDIMM slot 1A. FBDIMMs must be installed in sequential order, beginning with bank A.

Thanks to Intel website The board has two 240-pin DIMM sockets and supports the following memory features: * 1.8 V (only) DDR2 SDRAM DIMMs with gold-plated contacts * Unbuffered, single-sided or double-sided DIMMs with the following restriction: Double-sided DIMMs with x16 organization are not supported. * 2 GB maximum total system memory * Minimum total system memory: 128 MB * Non-ECC DIMMs * Serial Presence Detect * DDR2 533 or DDR2 400 SDRAM DIMMs Note To be fully compliant with all applicable DDR SDRAM memory specifications, the board should be populated with DIMMs that support the Serial Presence Detect (SPD) data structure. This allows the BIOS to read the SPD data and program the chipset to accurately configure memory settings for optimum performance. If non-SPD memory is installed, the BIOS will attempt to correctly configure the memory settings, but performance and reliability may be impacted or the DIMMs may not function under the determined frequency.

The D845GLLY board provide the following memory features:

• Two DIMM sockets supporting 3.3 V (only) 168-pin 133 MHz Single Data Rate (SDR) SDRAM DIMMs with gold-plated contacts
• Unbuffered non-ECC DIMMs only
• Maximum total system memory: 2 GB; minimum total system memory: 64 MB
• Serial Presence Detect (SPD) DIMMs only
• Suspend to RAM

CAUTION:
Do not use ECC DIMMs with the Desktop Board. Using ECC DIMMs could damage the Desktop Board.
Integrator's Notes:

• Registered DIMMs are not supported on the Desktop Board.
• This Desktop Board has been designed to support DIMMs based on 512 Mbit technology for a maximum onboard capacity of up to 2 GB, but this technology has not been validated on this board.

Note:
To be fully compliant with all applicable PCI33 SDRAM memory specifications, the board should be populated with DIMMs that support the Serial Presence Detect (SPD) data structure. This allows the BIOS to read the SPD data and program the chipset to accurately configure memory settings for optimum performance.

I hope it helps!!!

The motherboard you mentioned supports DDR1 RAM.

For windows xp and general application 512 MB is enough.
But if you use memory intensive applications like image/video editing then you can opt for 1-2 GB RAM.

■The system will operate in single channel mode if the DIMM sockets are populated in one channel only.
■The system will operate in dual channel Asymmetric mode if the total memory capacity of the DIMMs in Channel A is not equal to the total memory capacity of the DIMMs in Channel B.
■The system will operate in a higher-performing dual channel Interleaved mode if the total memory capacity of the DIMMs in Channel A is equal to the total memory capacity of the DIMMs in Channel B. However, the technology and device width can vary between the channels, For example, if Channel A is populated with two 256 MB DIMMS and Channel B is populated with one 512 MB DIMM, the system will operate in Interleaved mode.

My manual for P4P800-VM says :-
Mode Dimm A1 DimmA2 DIMM b1 dIMM b2
single ch 1 populated
2 populated
3 populated
4 populated
---------------------------------------- ----------------------------------
Dual ch 1 populated populated
2 populated populated
3 populated popuated populated populated
for dual channel 3 configuration you may
install identical dimms in all four sockets or
identical in A1 and B1 [blue ]
and identical in dimm A2 and dimm B2 [black sockets ].
Probably same as yours
Good luck
64bvt