*SIGH*
Well, some of what they point out (though not at the beginning) is that "green" is both power savings, plus ROHS ("cleaner" manufacturing).
Okay, so the PSU is 80+. Still, even thinking that you will need 650W for an energy efficient computer is just being retarded. Alright, that's already been beat to death by all the above posters.
The green PC uses all lead-free components, starting with the Antec SOLO case. Made mostly from plastics, this light-as-a-pillow case uses the ATX form factor
W... T... F... I have that case, and while it isn't as heavy as the Antec 1080AMG that I had a few years ago, it is far from being "light-as-a-pillow." Has this author even hefted the case and compared it to others?
unlike some Zalman fans I've tried, the Big Typhoon really is whisper-quiet
What? Sure, the Big Typhoon can be quiet with an undervolted 120mm fan, but I've never thought Zalman fans were noisy - I've always used the included Fan Mate (and now just "Smart Fan" in BIOS).
I chose the Intel Core 2 Duo E6700 processor. This CPU runs 42 percent faster (per SYSmark 2004 SE scores) than the Intel Pentium D 960 yet consumes 40 percent less energy... it consumes only 65 watts
Not that they are easily available, but there are AMD x2 chips that are 35W rated.
I also chose the matching Intel DG965SS motherboard...
The Intel board has integrated 3D graphics and surround sound, which means you can skip those expansion cards and save more energy.
Okay, using IGP?
Total: 168 watts
Note: The watts listed are the highest for normal operation when the component is active.
Okay, so they added up the "rated" peak wattage for that number. What? They didn't actually measure REAL power draw from the wall?
Their power usage conclusion makes the choice of a 650W PSU even more dumb.
Their "online extra" said to use a desktop board that takes a mobile CPU.
My take is that for the super energy conservationist with modest PC needs, get a VIA solution using one of their newer C7 chips, combine with an efficient PicoPSU and a notebook HDD. Voila, a computer that will draw less than 50W from the wall, and probably closer to 25W.
For a more mainstream setup, probably a lower end C2D or A64 on an overclockable motherboard so that it can be undervolted (or use software controls). A 7600GT video card will probably be a good balance between performance and low power draw. Fortron makes a 300W "Green" PSU that is supposedly 80+, and costs only $32 at Newegg.