How much would it cost to throw a cell in PS4?

[GameAnalyser]

Sal.Paradise said:

The viability all depends on how easy it will be to bring PSN games to PS4 without using integrated hardware.

Having to spend ~$40 for cell integration would pay off quickly if that meant the thousands of games already on PSN available for download to PS4 customers over its lifetime, and there was no other way to achieve this. As well as the extra consumers it would incentivise to upgrade to PS4 as it will play their PS3 games.

But if, say, ~80/90% of PSN's library can be ported over to PS4 either through PC versions, Gaikai streaming or software emulation, that ~$40 upfront hit seems like a less desirable route to take. 

Streaming or software emulation seems the ideal bet.