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MB820 User’s Manual 5
ATX Power Installation
The system power is provided to the motherboard with the ATXP1 and
ATXP2 ATX power connectors. ATXP2 is a 4-pin 12V power connector.
ATXP1 is to be connected to a standard ATX power connector.
Installing the Memory
The MB820 motherboard supports four DDR memory sockets for a
maximum total memory of 4GB in DDR memory type. You can install
unbuffered & ECC DDR DIMMs. It supports DDR266 when installed
with CPUs that have clock speeds of 400MHz. It supports DDR266/333
when installed with CPUs that have clock speeds of 533MHz. It supports
DDR266/320/400 when installed with CPUs that have clock speeds of
800MHz. The board provides dual channel functionality for its DIMM
slots. DIMM1/2is for one channel and DIMM3/4 is for another channel.
Enabling dual channels can increase data access rates by putting two
similar-size DDR modules into two same-color DIMM slots.
Basically, the system memory interface has the following features:
Supports two 64-bit wide DDR data channels
Available bandwidth up to 3.2GB/s (DDR400) for single-channel
mode and 6.4GB/s (DDR400) in dual-channel mode.
Supports ECC DIMMs.
Supports 128Mb, 256Mb, 512Mb, 1Gb DDR technologies.
Supports only x8, x16, DDR devices with four banks
Registered DIMMs not supported
Supports opportunistic refresh
Up to 16 simultaneously open pages (four per row, four rows
maximum)