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Shinobi-san said:
From the spec sheet doc:

"The Graphics Processing Unit (GPU) has been enhanced in a number of ways,
principally to allow for easier use of the GPU for general purpose computing (GPGPU) such as
physics simulation. The GPU contains a unified array of 18 compute units, which collectively
generate 1.84 Teraflops of processing power that can freely be applied to graphics, simulation
tasks, or some mixture of the two.
PS4 is equipped with 8 GB of unified system memory, easing game creation and
increasing the richness of content achievable on the platform. GDDR5 is used for this memory,
giving the syste"


They actually used a full 8GB of GDDR5. That's insane, I tought it would be 4GBs of GDDR5 and the other 4GBs would be DDR3 for the OS. If the price is similar to the rumored $429 then it's gonna be incredibly cheap for that kind of hardware.