Intel Pentium D 805 HH80551PE0672MN User Manual

Intel dual-core processors 

have two complete execution cores in one processor pack-

age running at the same frequency. Both cores share the

same packaging and the same interface with the chipset 

memory. However, they operate as distinct execution cores.

Dual-core processing is one way of delivering performance

while balancing power requirements.

Technology. Available with

the 840 and 830 processors, Enhanced Intel Speedstep

Technology allows the system to dynamically adjust processor

voltage and core frequency, which can result in decreased 

average power consumption and decreased average heat

production. By decreasing power and heat on Desktop PCs,

system builders can (depending on system configurations)

potentially lower acoustics, and even develop more innovative

small form factor designs. Additionally, this feature may help

address power concerns in companies with sites approaching

the limits of bounded electrical infrastructures. Combined with

existing power saving features, Enhanced Intel SpeedStep

technology may provide an excellent balance between provid-

ing power when you need it and conserving it when you don’t.

Level 1 Cache. The Pentium D processor features two 

16KB data caches. In addition to the data cache, each core

includes an Execution Trace Cache that stores up to 12 K 

decoded micro-ops in the order of program execution. This

can increase performance by removing the decoder from the

main execution loop and makes more efficient usage of the

cache storage space since instructions that are branched

around are not stored.

2MB Level 2 Cache. The Intel Pentium D processor 

based upon Intel 90nm process technology has a 1MB L2

Advanced Transfer Cache for each core (2MB total) improving

overall system performance by allowing each processor core

to have faster access to larger amounts of the most often

used data.

. Intel EM64T provides an enhancement to

Intel’s 32-bit architecture by enabling the desktop processor

platform to access larger amounts of memory. With appropri-

ate 64-bit supporting hardware and software, platforms

based on an Intel processor supporting Intel EM64T can en-

able use of extended virtual and physical memory.

. This feature, combined with a 

supported operating system, allows memory to be marked 

as executable or non-executable. If code attempts to run in

non-executable memory the processor raises an error to the

operating system. 

Streaming SIMD Extensions 3 (SSE3). Single Instruction

Multiple Data Extensions significantly accelerates perform-

ance of digital media applications and includes additional 

integer and cache ability instructions that may improve other 

aspects of performance.

90nm Process Technology. The 90nm process 

technology is the latest in Intel manufacturing and 

technology leadership allowing for next generation 

transistor advantages, such as strained silicon lattice to 

deliver faster transistors and potentially increased performance.

• Built-in Self Test (BIST) provides single stuck-at-fault 

coverage of the microcode and large logic arrays, as 

well as testing of the instruction cache, data cache, 

Translation Lookaside Buffers (TLBs) and ROMs.

• IEEE 1149.1 Standard Test Access Port and Boundary 

Scan mechanism enables testing of the processor and 

system connections through a standard interface.

• Internal performance counters for performance 

monitoring and event counting.

• Includes a thermal monitor feature that allows 

motherboards to be more cost effective.