Gateway ALR 9250R, User Manual

Page: 69 / 226

Chapter 3: Components 55
DIMM installation sequence
You must install DIMMs in the correct order and in entire banks. All
DIMMs in the bank must be the same size and speed. DIMMs in other
banks may differ in size. If you use slower DIMMs in another bank, all
DIMMs operate at the slower speed (see the illustration Memory Banks on
page 54).
The sequence in which you must fill the banks is:
1.
Memory bank A
2.
Memory bank B
3. Memory bank C
4.
Memory bank D
System memory addressing
System memory begins at address 0 and is continuous (flat addressing) up
to the maximum amount of DRAM installed (exception: system memory is
noncontiguous in the ranges defined as memory holes using configuration
registers). The system supports both base (conventional) and extended
memory.
•
Base memory is located at addresses 00000h to 9FFFFh (the first
1 MB).
•
Extended memory begins at address 0100000h (1 MB) and
extends to FFFFFFFFh (4 GB), which is the limit of supported
addressable memory. The top of physical memory is a maximum
of 4 GB (to FFFFFFFFh)
Memory holes can be configured in Setup or the SSU and are used by some
legacy ISA boards. If you do not need to set up a memory hole for an ISA
expansion board, leave the memory in a contiguous state for optimal
performance.
Note:
Each memory bank
includes two DIMM sockets
in each row of connectors.
When installing DIMMs, be
careful to install the DIMMs
in the correct sockets for
the bank.
9250R.book Page 55 Friday, April 9, 1999 9:44 AM