Model Number |
Frequency |
L2-Cache |
Front Side Bus |
Multiplier |
Voltage |
TDP |
Socket |
Release Date |
Part Number(s) |
Pentium 4 HT 2.4C |
2400 MHz |
512 KiB |
800 MT/s |
12x |
1.475/1.525 V |
66.2 W |
Socket 478 |
May 21, 2003 |
RK80532PG056512 |
Pentium 4 HT 2.6C |
2600 MHz |
512 KiB |
800 MT/s |
13x |
1.475/1.525 V |
69 W |
Socket 478 |
May 21, 2003 |
RK80532PG064512 |
Pentium 4 HT 2.8C |
2800 MHz |
512 KiB |
800 MT/s |
14x |
1.475/1.525 V |
69.7 W |
Socket 478 |
May 21, 2003 |
RK80532PG072512 |
Pentium 4 HT 3.0 |
3000 MHz |
512 KiB |
800 MT/s |
15x |
1.475/1.55 V |
81.9 W |
Socket 478 |
April 14, 2003 |
RK80532PG080512 |
Pentium 4 HT 3.06 |
3066 MHz |
512 KiB |
533 MT/s |
23x |
1.475/1.55 V |
81.8 W |
Socket 478 |
November 14, 2002 |
RK80532PE083512 |
Pentium 4 HT 3.2 |
3200 MHz |
512 KiB |
800 MT/s |
16x |
1.475/1.55 V |
82 W |
Socket 478 |
June 23, 2003 |
RK80532PG088512 |
Pentium 4 HT 3.4 |
3400 MHz |
512 KiB |
800 MT/s |
17x |
1.475/1.55 V |
89 W |
Socket 478 |
February 1, 2004 |
RK80532PG096512 |
Model Number |
Frequency |
L2-Cache |
Front Side Bus |
Multiplier |
Voltage |
TDP |
Socket |
Release Date |
Part Number(s) |
Pentium 4 HT 2.8E |
2800 MHz |
1024 KiB |
800 MT/s |
14x |
1.25/1.4 V |
89 W |
Socket 478 |
February 1, 2004 |
RK80546PG0721M |
Pentium 4 HT 3.0E |
3000 MHz |
1024 KiB |
800 MT/s |
15x |
1.25/1.4 V |
89 W |
Socket 478 |
February 1, 2004 |
RK80546PG0801M |
Pentium 4 HT 3.2E |
3200 MHz |
1024 KiB |
800 MT/s |
16x |
1.25/1.4 V |
89/103 W |
Socket 478 |
February 1, 2004 |
RK80546PG0881M |
Pentium 4 HT 3.2F |
3200 MHz |
1024 KiB |
800 MT/s |
16x |
1.25/1.4 V |
84 W |
LGA 775 |
August 2004 |
|
Pentium 4 HT 3.4E |
3400 MHz |
1024 KiB |
800 MT/s |
17x |
1.25/1.4 V |
89/103 W |
Socket 478 |
February 1, 2004 |
RK80546PG0961M |
Pentium 4 HT 3.4F |
3400 MHz |
1024 KiB |
800 MT/s |
17x |
1.25/1.4 V |
115 W |
LGA 775 |
August 2004 |
|
Pentium 4 HT 3.6F |
3600 MHz |
1024 KiB |
800 MT/s |
18x |
1.25/1.4 V |
115 W |
LGA 775 |
August 4, 2004 |
|
Pentium 4 HT 3.8F |
3800 MHz |
1024 KiB |
800 MT/s |
19x |
1.25/1.4 V |
115 W |
LGA 775 |
November 2004 |
|
Pentium 4 HT 517 |
2933 MHz |
1024 KiB |
533 MT/s |
22x |
1.25/1.4 V |
84 W |
LGA 775 |
September 2005 |
HH80547PE0771MM |
Pentium 4 HT 520 |
2800 MHz |
1024 KiB |
800 MT/s |
14x |
1.25/1.4 V |
84 W |
LGA 775 |
June 2004 |
JM80547PG0721M |
Pentium 4 HT 520J |
2800 MHz |
1024 KiB |
800 MT/s |
14x |
1.25/1.4 V |
84 W |
LGA 775 |
October 2004 |
JM80547PG0721M |
Pentium 4 HT 521 |
2800 MHz |
1024 KiB |
800 MT/s |
14x |
1.25/1.4 V |
84 W |
LGA 775 |
June 12, 2005 |
JM80547PG0721MM HH80547PG0721MM |
Pentium 4 HT 524 |
3066 MHz |
1024 KiB |
533 MT/s |
23x |
|
|
LGA 775 |
|
HH80547PE0831MM |
Pentium 4 HT 530 |
3000 MHz |
1024 KiB |
800 MT/s |
15x |
1.25/1.4 V |
84 W |
LGA 775 |
June 2004 |
JM80547PG0801M |
Pentium 4 HT 530J |
3000 MHz |
1024 KiB |
800 MT/s |
15x |
1.25/1.4 V |
84 W |
LGA 775 |
October 2004 |
JM80547PG0801M |
Pentium 4 HT 531 |
3000 MHz |
1024 KiB |
800 MT/s |
15x |
1.25/1.4 V |
84 W |
LGA 775 |
June 12, 2005 |
JM80547PG0801M HH80547PG0801M |
Pentium 4 HT 540 |
3200 MHz |
1024 KiB |
800 MT/s |
16x |
1.25/1.4 V |
84 W |
LGA 775 |
June 21, 2004 |
JM80547PG0881M |
Pentium 4 HT 540J |
3200 MHz |
1024 KiB |
800 MT/s |
16x |
1.25/1.4 V |
84 W |
LGA 775 |
October 2004 |
JM80547PG0881M |
Pentium 4 HT 541 |
3200 MHz |
1024 KiB |
800 MT/s |
16x |
1.25/1.4 V |
84 W |
LGA 775 |
June 12, 2005 |
JM80547PG0881MM HH80547PG0881MM |
Pentium 4 HT 550 |
3400 MHz |
1024 KiB |
800 MT/s |
17x |
1.25/1.4 V |
84 W |
LGA 775 |
June 21, 2004 |
JM80547PG0961M |
Pentium 4 HT 550J |
3400 MHz |
1024 KiB |
800 MT/s |
17x |
1.25/1.4 V |
84 W |
LGA 775 |
October 2004 |
JM80547PG0961M |
Pentium 4 HT 551 |
3400 MHz |
1024 KiB |
800 MT/s |
17x |
1.25/1.4 V |
84 W |
LGA 775 |
June 12, 2005 |
JM80547PG0961MM HH80547PG0961MM |
Pentium 4 HT 560 |
3600 MHz |
1024 KiB |
800 MT/s |
18x |
1.25/1.4 V |
115 W |
LGA 775 |
June 21, 2004 |
JM80547PG1041M |
Pentium 4 HT 560J |
3600 MHz |
1024 KiB |
800 MT/s |
18x |
1.25/1.4 V |
115 W |
LGA 775 |
October 2004 |
JM80547PG1041M |
Pentium 4 HT 561 |
3600 MHz |
1024 KiB |
800 MT/s |
18x |
1.25/1.4 V |
115 W |
LGA 775 |
June 12, 2005 |
JM80547PG1041MM |
Pentium 4 HT 570J |
3800 MHz |
1024 KiB |
800 MT/s |
19x |
1.25/1.4 V |
115 W |
LGA 775 |
November 12, 2004 |
JM80547PG1121M |
Pentium 4 HT 571 |
3800 MHz |
1024 KiB |
800 MT/s |
19x |
1.25/1.4 V |
115 W |
LGA 775 |
June 12, 2005 |
JM80547PG1121MM |
Model Number |
Frequency |
L2-Cache |
Front Side Bus |
Multiplier |
Voltage |
TDP |
Socket |
Release Date |
Part Number(s) |
Pentium 4 HT 620 |
2800 MHz |
2048 KiB |
800 MT/s |
14x |
1.2/1.4 V |
84 W |
LGA 775 |
|
JM80547PH1072MM |
Pentium 4 HT 630 |
3000 MHz |
2048 KiB |
800 MT/s |
15x |
1.2/1.4 V |
84 W |
LGA 775 |
February 20, 2005 |
JM80547PG0802M |
Pentium 4 HT 640 |
3200 MHz |
2048 KiB |
800 MT/s |
16x |
1.2/1.4 V |
84 W |
LGA 775 |
February 20, 2005 |
JM80547PG0882M |
Pentium 4 HT 650 |
3400 MHz |
2048 KiB |
800 MT/s |
17x |
1.2/1.4 V |
84 W |
LGA 775 |
February 20, 2005 |
JM80547PG0962M |
Pentium 4 HT 660 |
3600 MHz |
2048 KiB |
800 MT/s |
18x |
1.2/1.4 V |
115 W |
LGA 775 |
February 20, 2005 |
JM80547PG1042M |
Pentium 4 HT 662 |
3600 MHz |
2048 KiB |
800 MT/s |
18x |
1.2/1.4 V |
115 W |
LGA 775 |
November 14, 2005 |
HH80547PG1042MH |
Pentium 4 HT 670 |
3800 MHz |
2048 KiB |
800 MT/s |
19x |
1.2/1.4 V |
115 W |
LGA 775 |
May 26, 2005 |
JM80547PG1122M |
Pentium 4 HT 672 |
3800 MHz |
2048 KiB |
800 MT/s |
19x |
1.2/1.4 V |
115 W |
LGA 775 |
November 14, 2005 |
HH80547PG1122MH |
Model Number |
Frequency |
L2-Cache |
Front Side Bus |
Multiplier |
Voltage |
TDP |
Socket |
Release Date |
Part Number(s) |
Pentium 4 HT 631 |
3000 MHz |
2048 KiB |
800 MT/s |
15x |
1.2/1.4 V |
86 W |
LGA 775 |
January 16, 2006 |
HH80552PG0802M |
Pentium 4 HT 641 |
3200 MHz |
2048 KiB |
800 MT/s |
16x |
1.2/1.4 V |
86 W |
LGA 775 |
January 16, 2006 |
HH80552PG0882M |
Pentium 4 HT 651 |
3400 MHz |
2048 KiB |
800 MT/s |
17x |
1.2/1.4 V |
86 W |
LGA 775 |
January 16, 2006 |
HH80552PG0962M |
Pentium 4 HT 661 |
3600 MHz |
2048 KiB |
800 MT/s |
18x |
1.2/1.4 V |
86 W |
LGA 775 |
January 16, 2006 |
HH80552PG1042M |
Hyper-threading, officially called Hyper-Threading Technology (HTT), is Intel's trademark for their implementation of the simultaneous multithreading technology on the Pentium 4 microarchitecture. It is a more advanced form of Super-threading that debuted on the Intel Xeon processors and was later added to Pentium 4 processors. The technology improves processor performance under certain workloads by providing useful work for execution units that would otherwise be idle, for example during a cache miss. A Pentium 4 with Hyper-Threading enabled is treated by the operating system as two processors instead of one.
The advantages of Hyper-Threading are listed as: improved support for multi-threaded code, allowing multiple threads to run simultaneously, improved reaction and response time, and increased number of users a server can support.
According to Intel, the first implementation only used an additional 5% of the die area over the "normal" processor, yet yielded performance improvements of 15–30%.
Intel claims up to a 30% speed improvement compared against an otherwise identical, non-SMT Pentium 4. The performance improvement seen is very application-dependent, however, and some programs actually slow down slightly when Hyper Threading Technology is turned on. This is due to the replay system of the Pentium 4 tying up valuable execution resources, thereby starving the other thread. However, any performance degradation is unique to the Pentium 4 (due to various architectural nuances), and is not characteristic of simultaneous multithreading in general.