Sun Microsystems Ultra 80 Service Manual page 188

Caution – Use proper ESD grounding techniques when handling components. Wear
an antistatic wrist strap and use an ESD-protected mat. Store ESD-sensitive
components in antistatic bags before placing them on any surface.
1. Review the important memory installation information below before you begin
replacing or installing the memory.
Note – Bank 0 is the default DIMM position for DIMMs installed at the factory. If
DIMMs are being installed rather than being replaced, fill additional DIMM banks
with identical capacity DIMMs in this order: bank 0 and bank 1 (for 2-way
interleaving); or bank 0, bank 1, bank 2, and bank 3 (for 4-way interleaving).
The DIMMs are arranged in four banks, each bank consisting of four slots. The four
slots in each bank are separated, with two slots on the motherboard, and two slots
on the memory riser assembly. Refer to the following table and figure.
TABLE 9-2
DIMM Bank
3
1
2
0
Note – The following figure shows the placement of the DIMM banks on the
memory riser assembly (left) and the motherboard (right). On the motherboard,
bank 3 is closest to the system top, bank 0 is closest to the CPU shroud.
-28 Sun Ultra 80 Service Manual • March 2000
DIMM Bank Arrangement
DIMM Slots on Memory Riser
Assembly
U0403, U0404
U0401, U0402
U0303, U0304
U0301, U0302
DIMM Slots on Motherboard
U1403, U1404
U1401, U1402
U1303, U1304
U1301, U1302