HP Compaq d330 DT Technical Reference Manual page 49

Figure 3-2 illustrates the internal architecture of the Pentium 4 processor.
Branch
Prediction
Rapid Exe. Eng.
Core speed
Pentium 4 Type
3.20
3.06
3.00
2.80
2.80
2.66
2.60
2.60
2.53
2.40
2.40B
2.40
2.26
2.20
2A
2.0
1.90
1.80
1.70
1.6
Figure 3–2. Pentium 4 Processor Internal Architecture
The Pentium 4 increases processing speed with higher clock speeds made possible with hyper-
pipelined technology that can handle 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 100- or 133-MHz clock but provides bi- and
quad-pumped transfers through the use of 2x and 4x-MHz strobes. The Pentium 4 can transfer a
complete 64-byte cache line in two 133-MHz bus cycles for a throughput rate of 4.2 GB/s.
Address information is transferred at a 2x rate.
Pentium 4 Processor
16-K Execution
Trace Cache
CPU
Out-of-Order
Core
ALUs
ALU Speed (Core speed x2)
Core Speed ALU Speed
3.20 GHz 6.4 GHz
3.06 GHz 6.12 GHz
3.00 GHz 6.0 GHz
2.80 GHz 5.6 GHz
2.80 GHz 5.6 GHz
2.66 GHz 5.3 GHz
2.60 GHz 5.2 GHz
2.60 GHz 5.2 GHz
2.53 GHz 5.1 GHz
2.40 GHz 4.8 GHz
2.40 GHz 4.8 GHz
2.40 GHz 4.8 GHz
2.26 GHz 4.4 GHz
2.20 GHz 4.4 GHz
2.00 GHz 4.0 GHz
2.00 GHz 4.0 GHz
1.90 GHz 3.8 GHz
1.80 GHz 3.6 GHz
1.70 GHz 3.4 GHz
1.60 GHz 3.2 GHz
hp compaq d330 and d530 Series Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition - June 2003
Technical Reference Guide
128-bit
L2
Integer
8-K
Adv..
FPU L1
Transfer
Data
Cache
Cache
FSB
I/F
FSB speed (max. data transfer rate)
FSB Speed L2 Cache Size
800 MHz 512 KB
533 MHz 512 KB
800 MHz 512 KB
800 MHz 512 KB
533 MHz 512 KB
533 MHz 512 KB
800 MHz 512 KB
400 MHz 512 KB
533 MHz 512 KB
800 MHz 512 KB
533 MHz 512 KB
400 MHz 512 KB
533 MHz 512 KB
400 MHz 512 KB
400 MHz 512 KB
400 MHz 256 KB
400 MHz 256 KB
400 MHz 256 KB
400 MHz 256 KB
400 MHz 256 KB
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