If user's don't have Vista, then that's a pretty goodly-sized pool of satisfied users.
Contrast that with the size of the pool of R600 users.
Nvidia's driver situation isn't great, but its strategic position can probably weather a snafu on a new OS. They could even try some kind of voucher or other PR reward.
Not having a new product on any OS with the clock ticking is a wee bit different. AMD can't very well make a voucher for its own card, or can it?
Contrast that with the size of the pool of R600 users.
Nvidia's driver situation isn't great, but its strategic position can probably weather a snafu on a new OS. They could even try some kind of voucher or other PR reward.
Not having a new product on any OS with the clock ticking is a wee bit different. AMD can't very well make a voucher for its own card, or can it?