System Memory - Asus Rambus P3C-L User Manual

3. HARDWARE 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
1. 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.
24 ASUS P3C-L / P3C-S / P3C-LS User's Manual