Celeron (NetBurst)

Celeron (NetBurst)

Willamette-128

These Celerons were for socket 478 and were based on the Willamette Pentium 4 core, being a completely different design compared to the previous Tualatin Celeron. These are often known as the "Celeron 4". Their L2 cache (128 KiB) is half that of the Pentium 4 Willamette's 256 KiB of L2 cache, but otherwise the two are very similar. With the transition to the Pentium 4 core the Celeron now featured SSE2 instructions. The ability to share the same socket as the Pentium 4 meant that the Celeron now had the option to use RDRAM, DDR SDRAM, or traditional SDRAM. Willamette Celerons were launched May 15, 2002, initially at 1.7 GHz, and offered a noticeable performance improvement over the older Tualatin Celeron 1.3 GHz part, being able to finally beat the Duron 1.3 GHz, which at the time was AMD's top competing budget processor. On June 12, 2002, Intel launched the last Willamette Celeron, a 1.8 GHz model.

In Intel's "Family/Model/Stepping" scheme, Willamette Celerons and Pentium 4s are family 15, model 1, and their Intel product code is 80531.

Northwood-128

These socket 478 Celerons are based on the Northwood Pentium 4 core, and also have 128 KiB of L2 cache. The only difference between the Northwood-128 and the Willamette-128 Celeron is the fact that it was built on the new 0.13 micrometre process which shrunk the die size, increased the transistor count, and lowered the core voltage from 1.7 V on the Willamette-128 to 1.52 V for the Northwood-128. Despite these differences, they are functionally the same as the Willamette-128 Celeron, and perform largely the same clock-for-clock. The Northwood-128 family of processors were initially released as a 2.0 GHz Model (a 1.9 GHz model was announced earlier, but never launched) on September 18, 2002. Since that time Intel has released at total of 10 different clock rates ranging from 1.8 GHz to 2.8 GHz, before being surpassed by the Celeron D. Although the Northwood Celerons suffer considerably from their small L2 cache, some clock rates have been favored in the enthusiast market, because like the old 300A, they can run well above their specified clock rate.

In Intel's "Family/Model/Stepping" scheme, Northwood Celerons and Pentium 4s are family 15, model 2, and their Intel product code is 80532.