Power Supplies Sizes?

[Kroze]

Are all of the power supplies sizes the same? I'm planning to upgrade my 300 watt to something higher. Maybe 430.

 

[Uthiroid]

yes, but there are some differences in the number of fans and their placement. for instance, some of the enermax ps's have a fan on the bottom that is good for cooling but is partially obstructed in some cases. I also don't know but assume that the redundant power supplies are huge.