[quote]Originally posted by KidRed:
<strong>X is multi-threaded (I hope) so it can tell the apps to use both processors as well as do background and secondary actions</strong><hr></blockquote>In the end, you have to look at the empirical results, rather than the theoretical "it's multi-threaded" promise of X. And from what I've seen, you only get a speed boost if you're using explicitly multi-threaded apps.
" target="_blank">Here's one example from MacSpeedZone.</a>
Anyway, whether a dual 800 is better than an 867 is an interesting question. But at many hundred dollars more? I doubt it. (And I say that as a dual-user). But I'd still much rather have a 1.6Ghz than a dual 800.
I've always felt like this is something that hasn't been entirely fleshed out by Mac-ers, but it's just taken as an article of faith that a dual is great. Perhaps a new thread on this sometime could get some of the experts to voice their opinion.