Processor Upgrading; Memory Subsystem - HP Compaq dc7100 DT Technical Reference Manual

Figure 3-2 illustrates the internal architecture of the Intel Pentium 4 processor.
Core speed
Pentium Type
P4 560
P4 550
P4 540
P4 530
P4 520
Figure 3-2. Pentium 4 Processor Internal Architecture
The Intel Pentium 4 increases processing speed by using higher clock speeds with
hyper-pipelined technology, therefore handling significantly more instructions at a time. The
Pentium 4 features a branch prediction mechanism improved with the addition of an execution
trace cache and a refined prediction algorithm. The execution trace cache can store 12 kilobytes
of micro-ops (decoded instructions dealing with branching sequences) that are checked when
re-occurring branches are processed. Code that is not executed (bypassed) is no longer stored in
the L1 cache as was the case in the Pentium III.
The front side bus (FSB) of the Pentium 4 uses a 200-MHz clock but provides bi- and
quad-pumped transfers through the use of 2x- and 4x-MHz strobes. The Pentium 4 processor is
compatible with software written for x86 processors.

3.2.2 Processor Upgrading

All units use the LGA775 ZIF (Socket T) mounting socket. These systems require that the
processor use an integrated heatsink/fan assembly. A replacement processor must use the same
type heatsink/fan assembly as the original to ensure proper cooling.
The processor uses a PLGA775 package consisting of the processor die mounted "upside down"
on a PC board. This arrangement allows the heat sink to come in direct contact with the processor
die. The heat sink and attachment clip are specially designed provide maximum heat transfer
from the processor component.
Ä
CAUTION: Attachment of the heatsink to the processor is critical on these systems. Improper attachment
of the heatsink will likely result in a thermal condition. Although the system is designed to detect thermal
conditions and automatically shut down, such a condition could still result in damage to the processor
component. Refer to the applicable Service Reference Guide for processor installation instructions.
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CAUTION: Installing a processor that is not supported by the system board may cause damage to the
system board and/or the processor.
Technical Reference Guide
Pentium 4 Processor
Branch 16-K Execution
Prediction Trace Cache
CPU
Rapid Exe. Eng. Out-of-Order
Core
ALUs
ALU Speed (Core speed x2)
Core Speed
3.60 GHz
3.40 GHz
3.20 GHz
3.00 GHz
2.80 GHz
361834-002
128-bit
8-K
Integer
L1
FPU
Data Transfer
Cache
FSB
I/F
FSB speed (max. data transfer rate)
ALU Speed FSB Speed
7.2 GHz 800 MHz
6.8 GHz 800 MHz
6.4 GHz 800 MHz
6.0 GHz 800 MHz
5.6 GHz 800 MHz
Processor/Memory Subsystem
L2
1-MB
Adv..
L2
Cache
L2 Cache Size
1 MB
1 MB
1 MB
1 MB
1 MB
3-3