I've read and read and read on the subject, and watched many videos about upgrading the 1,1. 5365s are fairly cheap on ebay so I'm very, VERY tempted to get a pair and finally do it. My current model is a factory dual-core 3.0 bought in late 2006, or early 2007 I'm not sure... 16GB ram, Apple-sold HD5770 (purchased a couple years later) + SSD 250GB (purchased late 2015). This mac runs great, I've installed all OS iterations from 10.5 to 10.11x. on it. Upgrading the CPUs might be a nice (and only ) way to give it a proper speed boost right now. But few things are worrying me, mostly these 3: - power consumption (150W per CPU from what I've gathered - should I worry?) - temps - I'm guessing they will go higher after the upgrade? - since the 1,1 heatsinks were designed for slower CPUs, could it be an issue? I'm maniac about my temps, even with the stock CPUs I'm regularly checking istatsmenus when encoding a video for example, or when I'm working on a heavy ProTools project etc... This is a mac I use daily, I work on it too. I'm very comfortable with taking its insides apart, I've done it for years on all my Macs, though never replaced CPUs except on my old G4... So.....Am I safe to consider upgrading this puppy in 2016?