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Banned
Except that would require of them to change memory controller, which is inside norhtbridge, which is inside APU. Making changes inside APU is a very risky business. I dont know of any console that had changes inside its main chip ahitecture after it was released.
X360 simplified its motherboard by moving several chips onto one chip socket, but every chip remained the same. Bringing of X360 CPU and GPU closer toghether messed up communication timings between them, so MS added throttling between them so that perfect compatibility can be retained.
Yes, they will have to be very careful if they make a change like that. The downside if they don't make the change is that DDR3 is not going to get cheaper, it is already at base cost. The reason monolithic 8Gbit GDDR5 chips make sense is because there is demand for them outside of Sony. Nvidia's board partners are probably salivating at the thought of 16GB graphics cards and I'm sure Nvidia themselves will be happy to get 8GB reference cards for Maxwell on a 256bit bus. That kind of demand for low bandwidth RAM doesn't exist, which means the market is going to transition to DDR4 sooner rather than later and Microsoft will have to make the move as well.
Also, I know that DDR3 and GDDR5 chips are physically the same, it's just that selling the chips as GDDR5 gives Samsung and Hynix a far greater ROI. 8x 8Gbit DDR3 chips would be more costly than 16x 4Gbit DDR3 chips (no one would buy them) but 8x 8Gbit GDDR5 chips would start off around the same cost as 16x 4Gbit GDDR5 and over time they would go down in cost, and by around 2016/17 Sony will have to look moving to the new GDDR standard that comes with DDR4 or they will have to bear cost rises as GDDR5 demand decreases.
Because both console manufacturers have gone in at 16 of the most dense chips available on the very latest technologies that are close to being EOL'd, it will mean they both have to look at changing their APU mid-generation. Sony will just have to do it a bit later.
The problem for MS is that they couldn't wait for 8Gbit DDR4 chips to mature as that would take them deep into 2014. There would have been immediate advantages though, Samsung are planning 16Gbit DDR4 chips and they supposedly have 32Gbit chips on their roadmap, plus 2133MHz is the cheapest and most low end version of DDR4, while it is the highest binned version of DDR3. MS will have to make the move if they want to reduce costs, and I'm sure they will work with AMD and Samsung/Hynix to ensure compatibility is maintained properly.