[citation][nom]mitch074[/nom]Two years after it single-handedly swept the market, the 4850 is still a recommendation.Long term investment usually doesn't rhyme with It, but dang, is it reaching for the name of '440BX of GPUs'!(note: the 440BX, although limited in tech, was sold en masse for more than 3 years after it came out due to its unparalleled performance and incredible stability - even on a +70% overclock)[/citation]
The 440BX was nothing special, it was just a 100 MHz version of the 440LX, and a slightly emasculated 440GX. What made it sell was not what it was, but due to Intel. Ironically, it was not due to Intel's successes, but to their failures.
Rather than following the 440BX with a part that was better, they tried to force RDRAM on the market and came out with the i820, which was faster at 133 MHz than the BX was at 100 MHz, but actually slower at 133 MHz. RDRAM was poorly suited for Pentium III, and extremely expensive at that time. So, 440BX wasn't a great choice, especially since you were running AGP at 89 MHz if you ran the processor at 133 MHz, but, it was better than the super expensive i820 with RDRAM.
Intel did come out with the i840 as well, which was even more expensive and needed two channels of memory installed, but was very fast and a fine product. It was never sold into the mainstream.
VIA sold a SDRAM version, but it was dreadfully slow, and well, VIA. It actually sold pretty well just because the BX sucked by that time, and other Intel solutions were too expensive.
Eventually Intel released the i815, but naturally degraded performance so it would not be too attractive vis-a-vis the i820. Strangely, it ran faster at 100 MHz than the 440BX, but slower at 133 MHz. It did overclock better, and had better features, but Intel made sure to impose a limitation of 512 MB on it, just so the i820 would have a reason to exist. But, the i815, even though marginalized, was enough to kill the 440BX.
Intel did release SDRAM conversions for the i820 and i840, the MTH, but they were slow (especially on the i820), and had problems that created a fiasco for Intel.
By the time RDRAM came down in price, no one cared, and it died. It's kind of ironic that it was the best memory for the Pentium 4, and by that time was no more expensive than DDR, but the market had just come to hate RDRAM and wouldn't buy it anyway.
Anyway, the moral of this story isn't that that 440BX was so great that it lasted forever, it's that Intel orchestrated a move to an expensive technology that made no sense for the platform, and by doing so created a situation where there weren't good replacements for it, artificially extending its lifetime by their blundering.