Well, if you look at the overall system it has (like I posted earlier)
:arrow: 800 Mhz front side bus
:arrow: RAID0 hard drive set up with (2) 7,200 rpm drives
:arrow: 4 gigs of RAM
:arrow: Is 64 bit
:arrow: Has a 3.4 Ghz CPU
:arrow: It's an "Extremem Edition" CPU
:arrow: Has a dual lamp LCD
:arrow: The GPU is upgradable
:idea: The weak link is the video card, would be nice if it had the DELL's 512 MB Quadro card, but it is what it is.
Just because you have (2) 32 bit logical cores, doesn't mean you can overcome the simple facts that you are running
:arrow: 1 Gig of RAM
:arrow: A single 5,400 rpm hard drive
The original post was editied to include a new selection and drop the last notebook presented. The original last notebook was a Turion, now it is something different. I am not going to comment on that because we can keep changing the spec's forever to make everything written moot.
The 64 bit makes the 650 P4 the most futureproof of the bunch, the RAID0 and 4 gigs of RAM put it over the top of a T2400 core duo, if that is in fact what it is, he posts Centrino Duo and I am assuming that is what he means.
The T2xxx series was designed to take on the Turion notebook chip, I would say a T2400 can beat out maybe an ML-44 2.4 Ghz, maybe, it certainly can't take out another 1 Ghz on top of that... no way.
He states he uses it mostly for CAD and rendering. Anyone who has rendered huge files doesn't sit there "multi-tasking", you leave the thing, it churns away at it for hours, you certainly aren't going to risk crashing your project after 2 hours of rendering to post something on Tom's forum or check your email or run a virus scan.
A P4 650 can take on PLENTY of apps, I know, I had a 660 with 4 gigs of RAM in a take along CUBE system and it will smoke a T2400 if we're in the "real" world and not in the spirit world or something.
I guess at some point you just have to trust the person with the experience, or buy them both and see for yourself and show me I don't know what I am talking about.