What is the difference between a Pentium and a Celeron processor?

Do you know how to indentify them? Xia yuan / Getty Images

­ Here are the most important similarities and differences between the Pentium 4 and the Celeron chips coming out today:

  • Core - The Celeron chip is based on a Pentium 4 core.
  • Cache - Celeron chips have less cache memory than Pentium 4 chips do. A Celeron might have 128 kilobytes of L2 cache, while a Pentium 4 can have four times that. The amount of L2 cache memory can have a big effect on performance.
  • Clock speed - Intel manufactures the Pentium 4 chips to run at a higher clock speed than Celeron chips. The fastest Pentium 4 might be 60 percent faster than the fastest Celeron.
  • Bus speed - There are differences in the maximum bus speeds that the processors allow. Pentium 4s tend to be about 30 percent faster than Celerons.­

­When you sort all this out and compare the two chips side by side, it turns out that a Celeron and a Pentium 4 chip running at the same speed are different beasts. The smaller L2 cache size and slower bus speeds can mean serious performance differences depending on what you want to do with your computer. If all you do is check e-mail and browse the Web, the Celeron is fine, and the price difference can save you a lot of money. If you want the fastest machine you can buy, then you need to go with the Pentium 4 to get the highest clock speeds and the fastest system bus.See the next page for more CPU and processing information.­


Originally Published: Apr 1, 2000

Intel Celeron Processor FAQ

Is an Intel Celeron processor good?
Celeron processors offer good value for their money as they are based on four Pentium cores, but with less cache memory. They can be particularly useful if you use Windows 8.1 or 7. If you’re looking for a budget-friendly deal, Celeron processors are the right choice for small business and personal use.
Which is better: Intel Core or Pentium?
Intel is known to equip their Core brand with more powerful processors compared to the equivalent Celeron or Pentium models, even though they often use the same basic processor technology.
Which Intel Core is the best?
The AMD Ryzen 9 5950X with DirectX 12.00 takes the lead over Intel Core i9-10900K Processors with a 3DMark Physics score of 14133.
Is Core i3 better than Celeron?
Celeron and Core i3 both have the same number of cores. However, Core i3 has a 18GHz clock speed while Celeron has 1.1GHz making Core i3 the better choice.
Can I replace Celeron with i5?
You cannot replace your Celeron with i5 because Celerons belong to the LGA775 socket family while i5 technology is based on 1156 socket. Therefore, upgradation isn’t possible.