So I think people are getting way to caught up with numbers for numbers sake here. Let's not forget that the Switch is running on a completely different architecture than both the PS4 and XbOne. Let's also consider that most of the nvidia cards run better than AMD equivalents while using less ram and less memory bandwidth.
If the Switch uses a breakdown of 800MB for OS and 3.2GB dedicated to games, that would put the Switch at having almost the same amount of RAM as a GTX 970. Now I know they don't have the same memory bandwidth, but considering that this is only aiming for 1080p gameplay, it should be more than enough for the hybrid.
Nvidia seems like they went all in on customized software for this SoC, so I'm sure it contains all of the wizardry of compression techniques needed to maximize the available bandwidth. This is really starting to remind me of the GameCube days of a well thought out system that has specs that can truly be tapped into. The GC put visual effects on screen that on paper it shouldn't have been capable of doing and I think the Switch will do likewise...