A few words on why the P4 comes in SDRAM flavour motherboards.
1: Remember that corporations try to sell - selling something that costs LESS is easier.
2: Remember that 90% of users DON'T need powerhouses. Sure, having a P4 1.5 GHz is nice, but if they're using their system mostly for www-browsing, Word-processing and the odd game, there's not much point in spending the additional money for a high-spec system.
3: DDR seems to be an interesting contender to RDRAM. From what I've seen, RDRAM may be the better option overall, but DDR is definately a very good "go between" for the more performance aware users. Remember again, that most people aren't.
SDRAM is nice & cheap - so are the boards. Intel, no doubt, would like to see the P4 instead of the P3 across its entire range (there being high-end, medium, and low-cost ranges). Obviously, you can't get an RDRAM based system as easily into say a 600$ price range (or whatever) as you can get a system with SDRAM.
Equally, a 600$ system won't be coming with a GF3, but a GF2 MX200 or MX400 - which should be enough for occasional gaming.
I hope this lights up why there are SDRAM mobo's out there for P4. They're not supposed to be a CONTENDER for RDRAM-based P4. They're doing their job quite well though - lowering the total cost of a P4 system for more cost-concious users (i.e.: SDRAM == cheaper).
It's all down to marketing, and selling different "solutions" for the different product ranges.
Hope this makes sense & explains things 🙂.
