HP Integrity rx8640, Installation Manual

Page: 25 / 102

Chapter 1
HP Integrity rx8640 and HP 9000 rp8440 Server Overview
Detailed Server Description
25
The memory subsystem comprises four independent quadrants. Each quadrant has its own memory data bus
connected from the cell controller to the two buffers for the memory quadrant. Each quadrant also has two
memory control buses: one for each buffer.
Figure 1-8 Memory Subsystem
DIMMs
The memory DIMMs used by the server are custom designed by HP. Each DIMM contains DDR-II SDRAM
memory that operates at 533 MT/s. Industry standard DIMM modules do not support the high availability
and shared memory features of the server. Therefore, industry standard DIMM modules are not supported.
The server supports DIMMs with densities of 1, 2, 4, and 8 GB. Table 1-2 on page 26 lists each supported
DIMM size, the resulting total server capacity, and the memory component density. Each DIMM is connected
to two buffer chips on the cell board.
PDH Riser
Board
DIMM
Buffer
Address/
Controller
Buffer
Buffer
DIMM
DIMM
DIMM
QU
A
D
3
Cell
Controller
DIMM
DIMM
Buffer Buffer
DIMM
DIMM
QU
A
D
2
To Qua
d
2
Addr
e
s
s
/Contr
o
lle
r B
u
ff
e
rs
To Qua
d
3
Addr
e
s
s
/Contr
o
lle
r B
u
ff
e
rs
CPU 3
Front Side Bus 1
CPU 2
Front Side Bus 0
CPU 1 CPU 0
Buffer
DIMM
DIMM
DIMM
DIMM
Buffer
QU
A
D
0
To Qua
d
0
Addr
e
s
s
/Contr
o
lle
r B
u
ff
e
rs
To Qua
d
1
Addr
e
s
s
/Contr
o
lle
r B
u
ff
e
rs
Buffer
DIMM
Buffer
Address/
Controller
DIMM
DIMM
Buffer
QU
A
D
1
DIMM
Address/
Buffer
Controller
Address/
Controller
Buffer