In this post I'm going to list the popular Intel desktop [tag]CPU[/tag]s currently available.  I'll try to keep this updated with information from [tag]Intel[/tag] as [tag]processor[/tag]s change.

There are currently six Intel processor streams:

• [tag]Pentium[/tag] Processor Extreme Edition
  
  Processor Number: 840
  [tag]Clock Speed[/tag]: 3.20 GHz
  [tag]Front Side Bus[/tag]: 800 MHz
  [tag]Chipset[/tag]:
  - Intel 955X Express
  [tag]Socket[/tag]: LGA775
• Pentium, D Processor
  
  Processor Number: 840, 830, 820
  Clock Speed: 2.80 GHz to 3.20 GHz
  Front Side Bus: 800 MHz
  Chipset:
  - Intel 955X Express
  - Intel 945P Express
  - Intel 945G Express
  - Intel E7230
  Socket: LGA775
• Pentium 4 Processor Extreme Edition supporting Hyper-Threading Technology
  
  Processor Number: N/A
  Clock Speed: 3.20 GHz to 3.73 GHz
  Front Side Bus: 800 MHz to 1066 MHz
  Chipset:
  - Intel 955X Express
  - Intel 925XE Express
  - Intel 925X Express
  - Intel 915G Express
  - Intel 915P Express
  - Intel 875P Express
  - Intel 865PE
  - Intel 865G
  - Intel 865GV
  - Intel 848P
  Socket: LGA775, mPGA478
• Pentium 4 Processor supporting Hyper-Threading Technology and the Pentium 4 Processor
  
  Processor Number: 670, 660, 650, 640, 630, 571, 570J, 561, 560J, 560, 551, 550J, 550, 541, 540J, 540, 531, 530J, 530, 521, 520J, 520
  Clock Speed: 2.80 GHz to 3.80 GHz
  Front Side Bus: 800 MHz
  Chipset:
  - Intel 945P Express
  - Intel 945G Express
  - Intel 925XE Express
  - Intel 925X Express
  - Intel 915G Express
  - Intel 915GV Express
  - Intel 915GL Express
  - Intel 915P Express
  - Intel 915PL Express
  - Intel E7230
  Socket: LGA775
• Celeron D Processor
  
  Processor Number: 351, 350,  346, 341, 345, 340, 336, 335, 331, 330, 326, 325, 320, 315
  Clock Speed: 2.26 GHz to 3.20 GHz
  Front Side Bus: 533 MHz
  Chipset:
  - Intel 915GV Express
  - Intel 915GL Express
  - Intel 915G Express
  - Intel 915PL Express
  - Intel 915P
  - Intel 910GL Express
  - Intel 865PE
  - Intel 865P
  - Intel 865GV
  - Intel 865G
  - Intel 848P
  - Intel 845PE
  - Intel 845GV
  - Intel 845GE
  - Intel 845G
  - Intel 845E
  - Intel E7221
  Socket: LGA775, mPGA478
• Celeron Processor
  
  Clock Speed: 950 MHz to 2.80 GHz
  Front Side Bus: Up to 400 MHz
  Chipset:
  - Intel 845GV
  - Intel 845GL
  - Intel 815E
  - Intel 815
  - Intel 815EP
  - Intel 810E2
  - Intel 810E