<< It will surely be very fast, considering it will essentially have a GeForce3 built into it, but the fact is that I believe it still uses a UMA (unified memory architecture) and that will kill the performance down to GeForce2MX levels.
Perhaps with an add-on AGP card, it will be like the i815 and play well, but we can't be sure about that without seeing numbers. Remember, this is their first try at a mainstream chipset. >>
it does not have a geforce 3 built into it, that would take up too much transistor space. it has a geforce 2 mx built into it. i think you're confusing crush with the xbox northbridge, which does have a gf3 built into it essentially. anyhow, on the video performance, its likely to be even lower than geforce 2 mx levels since the clock is probably sync'd to the FSB (133MHz) and it has less available bandwidth (best case 2.1 GBps on the crush 12, much less than that on the crush 11).
but video performance is not why people are wanting to buy it (at least, i hope not, cuz the video will suck, even compared to my mx equivalent geforce 256). they want to buy crush because nvidia has more experience making DDR controllers than anyone else, so if anyone can build a good one, they can. plus 4.2GBps of theoretically available bandwidth is very attractive. plus the hypertransport between north and south bridge to get your hard drive off the saturated PCI bus, plus the kick@ss audio of the southbridge.