Besides the slightly beefier heatsink, I think that big capacitor gained some weight. I'm looking at the proportion of space between it and surrounding components. I wonder if the ratings are different.
The fans in Zalman's past power supplies have not been especially quiet, but this 120mm NMB-MAT fan is one of the smoothest power supply fans we've heard. In fact, at its lowest speed, it was smoother and quieter than the Seasonic S12. Considering that the S12s have the top spot for quiet fan-cooled PSUs, that's quite a compliment...
In spite of the almost identical circuit design and fan controller, the Zalman was clearly quieter than the Green PS. The difference is due almost completely to the different fan that Zalman has used.
This Zalman seems pretty nice and with sleeved cables as well.
Zalman ZM460-APS Power Supply $91 at eWiz
FSP Group FSP400-60GLN $47 at eWiz
OMG, the Fortron dropped in price. Both are in stock right now. I paid $51 for it at eWiz. If anyone wants to buy these, remember to search for it at Froogle and click through - you'll save a buck or two.
So the Zalman is quieter and more pimp while the Fortron is cheaper. The SPCR review also said that at lower power draw the lower wattage Fortron was more efficient since PSUs reach peak efficiency towards their maximum output, or something like that.
I've never owned a Zalman PSU but this one looks pretty nice. I do own one of the Fortron GLN units and though SPCR said it is noisier than the Zalman and Seasonic, I thought it was pretty darn quiet. For it to be the noisiest part of a system, the stock CPU, video and Northbridge fans would have to be replaced prior.