Why did Sony use the Cell processor in the PS3?

[rocketpig]

MikeB said:

Without using the SPEs at all the PS3 can produce games about on par with the current XBox 360 games library.

Um... No. The 360 has a better video card, more flexible RAM usage, and the tri-core CPU is vastly more powerful than the PS3's CPU minus the SPEs. What on Earth gave you that idea?