Comment by giobox
You are forgetting the massive price difference though. For sure a P3 was great if you had an unlimited budget, but a quick look at pricing sheets for September 1999 shows a 600mhz P3 at ~650 dollars.
The 300mhz celerons, easily over-clockable to 450/500mhz, where only ~150 dollars each. These prices are in 1999 dollars too, I haven't adjusted for inflation.
It was the value proposition, not the outright performance that made dual celeron builds attractive, especially in an age where we were having to upgrade far more often than we do today to keep up with latest trends.
In 1999 I vividly remember not being able to afford a P3 build, was largely why I ended up with the BP6. The P3 also had significant supply issues throughout its lifespan, which didn't help pricing at retail either.
I recall some kind of Intel trade show event where attendees got to buy a P3-500 and an SE440BX motherboard for $250.
It was awesome and was my main computer for years.