Celeron and Xeon: Intel Aims At The High/Low End
At the end of the 1990s, Intel launched two of its best-known processor brands: Celeron and Xeon. The former was aimed at the budget market and the latter at servers, and sometimes workstations. The first Celeron (Covington) was a Pentium II without a Level 2 cache, and suffered extremely poor performance, whereas the Pentium II Xeon had a large cache. Even now, both brands still exist—Celeron for the entry-level market (generally with a reduced cache and a slower FSB) and Xeon for servers (with a fast FSB, sometimes more cache, and high clock speeds).
Intel quickly added a cache to the Celeron with the Mendocino model (128 KB). The Celeron 300A is famous for its overclocking capacities, able to go 50% or more above its rated clock speed much of the time.
|Code name||Covington, Mendocino||Drake|
|Architecture||32 bits||32 bits|
|Data bus||64 bits||64 bits|
|Address bus||32 bits||36 bits|
|Maximum memory||4 GB||64 GB|
|L1 cache||16 KB + 16 KB||16 KB + 16 KB|
|L2 cache||0 KB/128 KB (internal, CPU frequency)||external, 512 KB-2,408 KB (CPU frequency)|
|Clock frequency||266-300 MHz/300-533 MHz||400-450 MHz|
|FSB||66 MHz||100 MHz|
|FPU||built in||built in|
|Fabrication process||250 nm||250 nm|
|Number of transistors||7,500,000/19,000,000||7,500,000 + cache|
|Power consumption||16–28 W||30-46 W|
|Voltage||2 V||2 V|
|Die surface area||131 mm²/154 mm²||131 mm² + cache|
|Connector||Slot1/Socket 370 PPGA||Slot 2|
Like the Pentium II, Xeon had an external L2 cache inside the processor cartridge. Its capacity was between 512 KB and 2 MB, and the number of transistors between 31 million and 124 million.