Asus X900-PI - Manual (Page 22)

22 ASUS P3C-E 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 support Direct RDRAMs (both ECC and non-ECC are supported) in 64, 96,
128, 192, and 256MB densities.
With an optional ASUS DIMM Riser, unbuffered Synchronous Dynamic Random
Access Memory (SDRAM, 3.3V power level) in 16, 32, 64, 128, 256, or 512MB
densities can also be used on these sockets.
The chipset’s Error Checking and Correction (ECC) feature is available only when
using RDRAMs. ECC feature is not available when using SDRAM (ECC and non-
ECC) with an ASUS DIMM Riser.
For memory speed setup, see 4.4.1 CHIP Configuration.
Install memory in any combination as follows:
Location Memory Module Subtotal
RIMM0 RDRAM (do not use when SDRAM is used) x 1
(Rows 0&1) C-RIMM (use when socket will not be populated)
RIMM1 RDRAM (do not use when SDRAM is used) x 1
(Rows 2&3) C-RIMM (use when socket will not be populated)
TOTAL SYSTEM MEMORY =
(RDRAM: 1GB Max) / (SDRAM: 1GB Max)
IMPORTANT
1. When using RDRAM as memory, the RIMM sockets must be populated in
the following sequence: RIMM0 and then RIMM1.
2. To use SDRAM with this motherboard, an ASUS DIMM Riser (ASUS DR2)
must be installed as an interface (see 3.5.2 Installing Memory Using the ASUS
DIMM Riser). The riser must be inserted into RIMM0, with RIMM1 populated
with C-RIMM.
3. C-RIMMs (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.
This assures the electrical integrity of a Rambus interface.
4. DO NOT mix RDRAMs with an SDRAM+Riser or vice versa.