Intel Celeron processor family

Intel Celeron 366 - FV80524RX366128 (FV524RX366 128)

All Intel Celeron processors in PPGA package were based on Mendocino core. Mendocino was the first Intel x86 core that integrated level 2 cache with the core (Pentium Pro had level 2 cache on a separate die, and Pentium II processors used external cache chips). The core had only 128 KB of level 2 cache, but smaller cache size was partially compensated by faster cache speed - it was running twice as fast as the Pentium II level 2 cache. The Mendocino core didn't require external cache chips, therefore it could fit on smaller and cheaper Plastic Pin Grid Array (PPGA) package. To work with the Celeron PPGA package Intel designed new 370-pin socket - socket 370, or PGA370.

Intel Celeron 950 - RB80526RY950128 (BX80526F950128)

Second generation of socket 370-compatible Celeron processors was based on Coppermine core. Like the Mendocino core, the Coppermine core had level 2 cache integrated on the die. The size of level 2 cache didn't change from older PPGA Celerons - it was 128 KB, or half the size of L2 cache of Pentium III Coppermine processors. The cache itself was improved - it featured 256-bit wide path to the cache and had lower latency than the cache of PPGA processors. Another enhancement in Coppermine Celerons was addition of SSE instructions, which could significantly boost processor performance in SSE-enabled applications. Core voltage of the Coppermine processors was reduced from 2.0 Volt to 1.5 - 1.75 Volt, which resulted in lower power consumption and cooler running processors. New package type of these Celerons, with processor die exposed on the top of the chip, also allowed better processor cooling. Coppermine Celeron microprocessors required revised socket 370 - this socket was mechanically, but not electrically compatible with PPGA Socket 370, which made all Copermine CPUs incompatible with many old Socket 370 motherboards.

Intel Celeron 1400 - RK80530RY017256 (BX80530F1400256)

The last generation of socket 370 Celeron processors featured Tualatin core with 256 KB level 2 cache, often called as Tualatin-256. Having twice as much cache as Coppermine Celerons, these microprocessors performed as fast as Pentium III Copermine processors running at the same Front Side Bus frequency (100 MHz). Besides larger level 2 cache, the Celerons also had lower core voltage and power consumption. The package of these processors was modified. It still used Flip-Chip packaging technology, where the processor die was mounted upside down on the top of the plastic package, but on Tualatin Celerons the die was covered by integrated heatsink. Like the Pentium III Tualatin CPUs, the Celerons used new bus interface, and, though the Celerons could fit into older socket 370 motherboards, the processors couldn't work in them. It was still possible to use special Tualatin socket 370 adapters to run Tualatin Celeron processors in old motherboards.

Intel Celeron 1600 - RK80531RC025128

Intel Celeron Willamette processors were the first Celerons based on NetBurst micro-architecture. Willamette Celeron CPUs featured 400 MHz Front-Side Bus, long 20-stage pipeline, SSE2 instructions and enhanced branch prediction. These Celeron processors were produced using 0.18 micron technology and had the same voltage as Pentium 4 Willamette processors. Level 2 cache size on the Celeron microprocessors was twice smaller than on Pentium 4, which resulted in about 10% lower performance of Celeron processors. Smaller L2 cache was the only difference of these CPUs from Pentium 4 processors with the same core.

Intel Celeron 2100 - RK80532RC045128 (BX80532RC2100B)

The next generation of Celeron-branded microprocessors was based on Pentium 4 Northwood core. These Celerons were produced on 0.13 micron technology, and had almost the same microarchitecture as Pentium 4 Northwood microprocessors with a few exceptions. Even though the size of L2 cache was doubled on Pentium 4 Northwood processors, Northwood Celerons had the same 128 KB L2 cache as their predecessors - Willamette Celeron. Front Side Bus frequency of Celeron processors was also unchanged. Celeron microprocessors didn't include Hyper-Threading technology that was present on all Pentium 4 Northwood CPUs with 800 MHz FSB. On a plus side, the Northwood Celerons had lower core voltage than their Willamette processors, as a result Northwood processors ran cooler. The Celeron CPUs were packaged in 478-pin FC-PGA2 package with integrated heatsink, and required socket 478 motherboards.