Comment Re:what? (Score 2) 42
Except that hothardware being tech geeks confuse cause and effect. The estimated cost of the 8GB of GDDR5 in the PS4 is ~$100, the hardware costs are almost the same and the "extra validation" mainly involves staying a little conservative with clock speeds and code optimizations. The real reason is market differentiation and if there is none you create one like with student and senior citizen discounts even though they all take up one seat. That lets you set entirely different prices based on the willingness to pay in workstation markets as opposed to gamer markets.
Of course to make it work, you must make sure that the workstation market won't use the gaming card so you make sure those features are absent or not working or not tested/validated/supported on the consumer cards. It's the same reason Intel won't give you ECC on a consumer motherboard/CPU like AMD does, it would be beneficial and cost next to nothing but it'd encourage penny-pinchers to use them as poor man's servers. It's all about steering customers to the "right" product, the rest is implementation details.