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Contents
Important Notes
System Memory Combinations
The Intel® PD440FX Motherboard has four SIMM sockets arranged in two banks: bank 0 and bank 1. Each bank has two sockets and provides a 64/72-bit wide data path. SIMMs in the same bank must be the same type (EDO, non-parity, parity, ECC), sizz, and speed; SIMMs in different banks may differ in type, size and speed. SIMMs must be installed in both sockets of a bank, and at least one bank must be filled for the motherboard to work. The minimum memory size is 8 MB and the maximum size is 256 MB. The BIOS automatically detects memory type and size, so no jumper settings are required.
The motherboard supports the following:
- 72 pin SIMM modules with tin-plated contacts only
- 50 ns or 60 ns DRAM speed only
- EDO SIMMs only
- Non-parity, parity or ECC SIMMs
- 5 V-memory only
- Single- or double-sided SIMMs
The motherboard supports SIMMs in the following sizes:
| SIMM Size |
Non-parity Configuration |
Parity and ECC Configuration |
| 4 MB |
1 x 32 |
1 x 36 |
| 8 MB |
2 x 32 |
2 x 36 |
| 16 MB |
4 x 32 |
4 x 36 |
| 32 MB |
8 x 32 |
8 x 36 |
| 64 MB |
16 x 32 |
16 x 36 | |
EDO DRAM
EDO DRAM improves memory-read performance by holding the memory data valid until the next falling edge of the CAS# signal. With EDO DRAM, the CAS# precharge overlaps the data-valid time, which allows the CAS# signal to negate earlier while still satisfying the memory data-valid window.
Parity/ECC DRAM
Memory error checking and correction supports the following operations:
- Parity memory operation -- detects single-bit errors but does not correct the errors
- Error checking and correcting (ECC) operation -- detects single-bit and double-bit errors, and corrects single-bit errors.
Use parity and ECC memory as follows:
- Parity and ECC SIMMs must not be mixed in the same bank.
- The 82441FX (PMC) memory controller automatically detects the presence of parity and ECC SIMMs (36-bit modules) and treats them identically.
- Parity and ECC operations are supported with parity or ECC SIMMs.
- Use the Setup program to enable parity or ECC support.
- If any non-parity SIMMs are installed, the memory operates in non-parity mode only. The Setup options for selecting parity or ECC model do not appear
The following table describes the effect of using Setup to put each memory type in each supported mode. Whenever ECC mode is selected in Setup, some loss in memory performance occurs.
| SIMM Type |
Disabled |
Parity |
ECC |
| Non-parity SIMMs |
No error detection |
N/A |
N/A |
| Parity SIMMs |
No error detection |
Single-bit error detection |
Single-bit error correction,
Double-bit error detection |
| ECCy SIMMs |
No error detection |
Single-bit error detection |
Single-bit error correction,
Double-bit error detection | |
SIMM Vendors - Web Sites
The list below contains vendors that have tested their memory for Intel PD440FX Motherboards and that have their products listed on their own website. Please visit their sites to obtain information on their products.
*Note: These sites will take you off of the Intel website. Intel is not responsible for the content on these sites.
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