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Soundwave said:

It could literally just be a second GPU or something, much like a streamlined version of Crossfire setups on PC. 

If you have a home NX maybe SCD upgrades the graphics to 2K-4K resolution. 

If you have a portable NX, maybe buying a SCD upgrades the system to home NX quality so you don't neccessarily have to buy the console. 

...This sounds like science fiction. I'm going to learn what this is more because I clearly don't understand this thing enough.