Reading the BeOS Bible talking about that is quite a throwback:
> As described elsewhere in this book, BeOS uses multiple processors with incredible efficiency. If you'll be running BeOS most of the time, you'll get more bang for your buck by getting two (or more) older processors than by installing one superfast CPU. Last year's 266 MHz CPUs will always be dirt cheap compared to today's 450 MHz CPU. Thus, when running BeOS, you could have 532 MHz for less than the cost of a single 450 MHz processor. The catch is that if you'll be dual-booting into operating systems that won't recognize a second CPU (such as Windows 95/98), you'll end up with half of your processor speed being wasted until you reboot into BeOS. Chance are that once you start using BeOS regularly, you won't want to use anything else, and you won't regret buying a multiprocessor machine.
> As described elsewhere in this book, BeOS uses multiple processors with incredible efficiency. If you'll be running BeOS most of the time, you'll get more bang for your buck by getting two (or more) older processors than by installing one superfast CPU. Last year's 266 MHz CPUs will always be dirt cheap compared to today's 450 MHz CPU. Thus, when running BeOS, you could have 532 MHz for less than the cost of a single 450 MHz processor. The catch is that if you'll be dual-booting into operating systems that won't recognize a second CPU (such as Windows 95/98), you'll end up with half of your processor speed being wasted until you reboot into BeOS. Chance are that once you start using BeOS regularly, you won't want to use anything else, and you won't regret buying a multiprocessor machine.
https://birdhouse.org/beos/bible/bos/ch_hardware1.html