Is gaming in DX12 really a concern? & How quickly will prices fall for RX-480 and GTX-1070?

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At the moment, no not really. It's a new standard and will take some time for developers to use as their default. This assumes of course they don't just skip it like they have with previous DX versions or that they will actually implement the features in DX12 that make it better than DX11. When done right performance does increase. AMD seems to get a bigger boost but Nvidia cards are father ahead to begin with so it does not make the AMD cards better than Nvida cards.

As for prices, supplies seem to keep being low so they keep selling above MSRP. Frankly do not expect them to dip under MSRP with any regularity until after the next gen comes out a year from now. Even then the prices won't dip that much judging by the price drop in...
And cards have hardware that dx12 benefits very well. Async compute I believe. I don't know all the details. It's makes the last gen look very good against the 970/980 gpus. I think the 1070/1080 have enough power it doesn't matter as much to be honest. The 490 may change all that.
 
At the moment, no not really. It's a new standard and will take some time for developers to use as their default. This assumes of course they don't just skip it like they have with previous DX versions or that they will actually implement the features in DX12 that make it better than DX11. When done right performance does increase. AMD seems to get a bigger boost but Nvidia cards are father ahead to begin with so it does not make the AMD cards better than Nvida cards.

As for prices, supplies seem to keep being low so they keep selling above MSRP. Frankly do not expect them to dip under MSRP with any regularity until after the next gen comes out a year from now. Even then the prices won't dip that much judging by the price drop in the Nvidia 900 series these days.
 
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