Eh, you do know that GDDR5 is currently used by a huge number of graphics card and that Sony and MS will not order hundreds of million of these chips?

hm.. depends

afaik the PS4 needs 16 x 521MB GDDR5 chips, so if they want to produce more than 6(.25) million PS4s they need more than 100million of the chips

hundreds! :) yes but in relation to graphic cards this would only add a little bit. the memory-price will most likely get lower if more graphic cards get sold and I think this will happen as pcs will have to have better specs to run the new games. it will most likely always be "special" memory.

Are you sure computer discrete graphics cards (that use gddr5 no less) sell that much? You might be right but would love to see data to help me process. But yeah. I agree with you. At the very least it would drive the total market up, as pc sales would increase too. Can't hurt right? 

http://www.tomshardware.com/news/GPU-fourth-quarter-discrete-embedded-graphics-market,21194.html

"A report released by Jon Peddie Research on Tuesday states that during the fourth quarter of 2012, only 28.8 million discrete GPUs were shipped. Compared to third quarter numbers, shipments dropped 16-percent while year-to-year (4Q12 to 4Q11) shipments dropped 9.7-percent. Nvidia suffered the most damage, feeling a 16.7-percent drop in quarter-to-quarter discrete GPU sales."

So one quarter with 28.8 million discrete gpus... PS4 and NextBox won't do this in one year ;) I don't want to look up how many of them use GDDR5 but I think it's safe to say that discrete gpus are sold very often.

But you are forgetting that most of those graphics cards use 1 or 2 GB, while the PS4 and the Nextbox (if the rumor is true) will use 8 GB.

Sure, they won't sell as many consoles as graphics cards, but each console sports 4x times as much RAM than a graphics card, so they will have an impact on the production of GDDR5 RAM, hopefully a good one.

Eh, you do know that GDDR5 is currently used by a huge number of graphics card and that Sony and MS will not order hundreds of million of these chips?

Expect to see the ram-size increased in the next years, also let's just do some math with easy numbers. It will have an impact, yes, but remember that if NextBox doesn't use GDDR5 (which I expect) Sony alone will use GDDR5-chips. And who knows how long GDDR5 will be the best tech for gpus. In 2 years it could be graphics-specific ram based on DDR4. But anyway, consoles always used expensive tech and it was almost always good that they did so.

Number of 4GBit GDDR5 chips currently used in graphics cards: ZERO
And lol at people who think Durango has GDDR5 chips...

True, but most of those 28.8 mil cards sold were by OEM PCs, which usually go with the lower models, so I wouldn't expect them to start using cards with more than 2GB anytime soon.

And who knows which kind of memory they come up next! We should be using DDR4 by now, yet the next Haswell CPUs will still use DDR3 (as far as I know).

Tech doesn't improve as fast as before, or at least it is less noticeable.