Main Memory; Edo Dram; Parity/Ecc Dram - Intel VS440FX Technical Specification

VS440FX Motherboard Technical Product Specification

1.6 Main Memory

The motherboard has four SIMM sockets arranged in two banks: Bank 0 and Bank 1. Each bank
has two sockets. SIMMs in the same bank must be the same type, size, 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. The BIOS automatically detects memory type and size
so no jumper settings are required.
The motherboard supports:
72-pin SIMMs with tin-plated contacts
60 ns fast page mode SIMMs or 60 ns EDO SIMMs
Non-parity, parity, or ECC SIMMs
Single- or double-sided SIMMs in the following sizes:
SIMM size
4 MB
8 MB
16 MB
32 MB
64 MB

1.6.1 EDO DRAM

EDO DRAM improves memory read performance by holding the memory data valid until the next
CAS# falling edge, unlike fast page mode DRAM, which tri-states the memory data when CAS#
negates to precharge for the next memory cycle. With EDO DRAM, the CAS# precharge overlaps
the data-valid time, which allows CAS# to negate earlier while still satisfying the memory-data
valid window.

1.6.2 Parity/ECC DRAM

Memory error checking and correction is supported by parity memory. With parity memory, the
motherboard can be configured to support ECC memory operation. Parity SIMMs are
automatically detected, but you must enter Setup to configure the memory for either Parity or ECC
operation. Parity memory detects single-bit errors. ECC memory detects double-bit errors and
corrects single-bit errors.
12
Configuration Configuration
(non-parity) (parity)
1 x 32 1 x 36
2 x 32 2 x 36
4 x 32 4 x 36
8 x 32 8 x 36
16 x 32 16 x 36