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1. Games in PC alredy uses 4GB RAM today (it is System RAM and VRAM... not only the 2GB of the video card)... What make yo thing PCs will not use 8GB in games in 4-5 years... PS4 needs to live all these years without modifications.

2. The PS4 GPU is suppose to have close 100% efficiency of the raw power... PC have avg. 50% efficiency of the raw power... this close 2TFLOPS on PS4 will peeform like 3TFLOPS GPUs on PC.

3. Devs are not idiots... they asked for 8GB RAM... thd fact didn't use that today is because there is no graphical leap in PC since the first Crysis in 2007... now with PS4 the PC games will have again a big graphical leap in the next years.

4. I'm the only impressed in how AMD and Sony put a HD 7870 equivalent GPU into a APU with a 8-core CPU? An APU with low parts is easy to make but with high parts like that is really impressive... put a even bigger GPU could be near impossible in a business perspective.

Conclusion: 4GB was a big mistake from Sony... I'm glad they fixed that bootleneck early.