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IB850 User’s Manual 9
ATX Power Installation
The system power is provided to the CPU card with the CN1 and J7 ATX
power connectors. Please note that the J7 external ATX power connector
should be connected to the backplane for IB850 to function. J7 is a 3-pin
power connector. CN1 is a 4-pin 12V power connector. CN1 is to be
connected to the ATX power supply.
Installing the Memory
The IB850 CPU card supports two DDR memory sockets for a maximum
total memory of 2GB in DDR memory type. You can install unbuffered
DDR DIMMs with ECC function. 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
DDR266/333/400 when installed with CPUs that have clock speeds of
800MHz. The board provides dual channel functionality for its DIMM
slots. DIMM1 is for one channel and DIMM2 is for the other channel.
Enabling dual channels can increase data access rates.
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/ non-ECC DIMMs.
Supports 128MB, 256MB, 512MB 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)