Pentium-E? -B? -EB? What?
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Dear CPU Scorekeeper

I have a question regarding some CPU's that I have run across, but for which you folks seem to have no performance evaluations currently. I am not sure if I have the actual descriptions right, but they are Intel processors with the following names:
bulletIntel P4 1.5 GHz EB
bulletIntel Xeon 3 1 GHz EB
bulletIntel P3 1 GHz EB
bulletIntel Xeon 3 1 GHz EB
bulletIntel P3 1 GHz EB
bulletIntel Xeon 3 933 MHz EB
bulletIntel P3 933 MHz EB
bulletIntel P3 866 MHz EB
bulletIntel P3 733 MHz EB

Would you be able to give me some sort of indication as to how these processors would perform relative to the ones you have on your site? What does the EB stand for?

- - Fred, February 2002

See the questionCPU Scorekeeper Responds

The whole E/B/EB naming convention was Intel's way of telling the difference between their original Pentium-III's (introduced in February 1999) and the various flavours of their second-generation 'Coppermine' Pentium-III's (introduced in September/October 1999) that happen to share the same clock speed.

The original Pentium-III's were built using the industry standard manufacturing process at that time, based on a 0.25 trace size. Times changed and the denser, more energy efficient 0.18 size became the new standard for all the 'Coppermine' series Pentium-III's and Xeons. As the first of these 0.18 processors operated at the same clock speed (500 MHz) as the older 0.25 chips, the 'E' distinguished the newer, slightly faster CPUs:

bulletPentium III 500: Old (0.25)
bulletPentium III 500E: New (0.18)

The 'B' designation identified pre-Coppermine Pentium-III's (built using the older 0.25 process) that ran on a 133MHz system bus, rather than the original 100MHz bus:

bulletPentium III 600: Old (100MHz bus)
bulletPentium III 600B: New (133MHz bus)

So, of course, 'EB' refers to the newer Coppermine Pentium-III's that run on a 133MHz bus.

As the Pentium-III increased in speed and standardised on the 133 MHz bus and the Coppermine architecture, the 'EB' designations became redundant and are normally dropped when referring to these faster chips. That's why the P3 733 and the 733 EB are actually the same CPU, as all 733 MHz Pentium-III's are Coppermines running on a 133 MHz bus. Similarly for the P3 866, 933, and the rest of the Xeon and desktop Pentium-III processors (mobile Pentium-III's are another story...) you inquired about. In our  CPU Scorecard lists, we have dropped the redundant 'EB' designation for these chips, for clarity and brevity.

The P4 'EB' is a myth, as Pentium 4's are neither Coppermines nor do they run on a 133 MHz bus. However, Intel does use the designation 'A' to distinguish between their original 'Willamette' and newer 'Northwood' Pentium 4's that happen to share the same clock speed (as in Pentium 4  2.0A).

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