Asus P3C-D User Manual download pdf (Page 24)

24 ASUS P3C-L / P3C-S / P3C-LS User’s Manual

3. HARDWARE SETUP

System Memory

3. H/W SETUP

3.5 System Memory

NOTE: No hardware or BIOS setup is required after adding or removing memory.

This motherboard has two Rambus Inline Memory Module (RIMM) sockets. These

sockets (see Important notes for details) support Direct RDRAMs (both ECC and

non-ECC are supported) in 64, 96, 128, 192, 256, and 512MB densities for a maxi-

mum of 1GB.

With the optional ASUS DR2 DIMM Riser, unbuffered Synchronous Dynamic Ran-

dom Access Memory (SDRAM, 3.3V power level) in 64, 128, 256, or 512MB densi-

ties with Serial Presence Detect (SPD) can also be used on the second socket for a

maximum of 1GB.

The chipset’s Error Checking and Correction (ECC) feature is available only when

using RDRAMs. ECC feature is not available when using SDRAM with an ASUS

DIMM Riser (ECC memory modules may still be used, but the ECC function will

not be available).

For memory speed setup, see 4.4.1 CHIP Configuration.

IMPORTANT

General

DO NOT attempt to mix RDRAMs with an SDRAM+Riser or vice versa.

RDRAM

1. If more than one socket will be populated with RDRAMs, RIMM0 must be

populated first and then RIMM1. If only one socket will be populated, RIMM0

must be populated with RDRAM, RIMM1 with C-RIMM. See table for an

overview.

SDRAM

1. To use SDRAM with this motherboard, an ASUS DR2 DIMM Riser must be

installed as an interface (see 3.5.2 Installing Memory Using the ASUS DR2 DIMM

Riser). The riser must (

and can only) be inserted into RIMM0, with the bundled

C-RIMM inserted into RIMM1. See table for an overview.

2. When populating both DIMM sockets in the riser, the module density on J1M2

must be greater than the one on J1M1.

3. This motherboard’s chipset only supports 64Mbit and 128Mbit SDRAMs (see

SDRAM Configurations). 32Mx4 128 Mbit support is for registered DIMMs

only. 4Mx16 64 Mbit support is for unbufferred DIMMs only.

C-RIMM/CTRIMM

1. Depending on your configuration, a C-RIMM (Continuity RIMM) must be used

to complete the sockets that are not populated by either RDRAMs or an ASUS

DIMM Riser (when using SDRAM). C-RIMM is necessary to avoid breaking

the signal lines, which are a serial connection in a Rambus interface, such as

used in this motherboard. The C-RIMM assures the electrical integrity of a

Rambus interface.

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