Intel AN430TX Product Specification - Page 13

Motherboard Description 1.6 Memory 1.6.1 Main Memory The motherboard has two 168-pin DIMM sockets. Memory can be installed in one or two sockets. Minimum memory size is 8 MB. Maximum memory size is 256 MB. The BIOS automatically detects memory type, size, and speed so no jumper settings are required. The motherboard supports the following: • 168-pin 3.3 V DIMMs with tin-plated contacts • 60 and 66 MHz bus speeds • 60 ns 3.3V EDO DRAM • 60 ns unrestricted CAS Latency 2 unbuffered 4-clock 3.3V SDRAM • Caching for the first 64 MB of main memory • 64-bit data path • Single- or double-sided DIMMs in the following sizes: DIMM Size 8 MB 16 MB 32 MB 64 MB 8 MB 16 MB 32 MB 64 MB 128 MB Type 60 ns EDO 60 ns EDO 60 ns EDO 60 ns EDO CAS Latency 2 SDRAM CAS Latency 2 SDRAM CAS Latency 2 SDRAM CAS Latency 2 SDRAM CAS Latency 2 SDRAM Configuration 1M x 64 2M x 64 4M x 64 8M x 64 1M x 64 2M x 64 4M x 64 8M x 64 16M x 64 Technology 16 Mbit 16 Mbit 16 Mbit 16 Mbit 16 Mbit 16 Mbit 16 Mbit 64 Mbit 64 Mbit Memory type, size, and speed can vary between sockets, so EDO and SDRAM can be installed on the same motherboard. Parity (x 72) DIMMs can be installed but are not recommended for the following reasons: • The motherboard does not provide parity checking or ECC • Parity DIMMs cause excessive capacitive loading on memory data and address lines 1.6.1.1 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 datavalid window. 13