"The MAIN difference between the DigiDoc 3 and the DigiDoc 5 is the size of fan they can swing. The DigiDoc 3 was limited to 2.4 Watts Per fan of Power. That's just big enough to power some 92mm fans but NO 120mm fan would fit under that limit. The DigiDoc 5 can power WAY more... How much more?.. I dunno. As this is a VERY early review of the device, all the info and not even a manual are out for it! So.. I thought let's hook up 2 of the biggest 120mm's I have laying around and see how it fares "
FULL STORY @ PROCOOLING (http://www.procooling.com/html/digidoc_5.shtml)