Sounds like a lot of confused terminology.
All Pentium 4 chipsets have a quad-pumped FSB, meaning that data is sent 4 times per clock cycle. With the base clock rate of 100MHz, it results in a 400MHz FSB, or a 533MHz FSB with a base rate of 133MHz.
There are several versions of the i845 chipset, differing in the type of RAM supported and FSB supported.
The idea that "built for low price, sold for low price" doesn't really apply, except for the most basic of the i845 variants, which supports SDR SDRAM. This is the one to avoid. Apart from that, the i845 chipset using DDR SDRAM is a very good solution that is stable and performs well.