Many a times Nvidia's has repeated that DX10 is not needed as it's just an incremental update. But now humbled by 48XX series cards from ATI, they are having second thoughts.
TG Daily - Nvidia expected to offer DirectX 10.1 GPU in Q1 2009
A presentation slide we received, but unfortunately cannot share with you in order to protect our source, clearly states that Nvidia will offer DirectX 10.1 support with its next-generation notebook GPUs that are scheduled for a spring 2009 release. DirectX 10.1 is also likely to be offered in the next desktop GPU generation, which should debut either late in Q4 2008 or Q1 2009, with a possible ramp throughout Q1 and Q2 of 2009.
So, what does that mean? Well, it depends on your view.
What we know for sure is that with Nvidia’s decision to support DX10.1, the industry will be embracing this API.
On the very high end, it may mean that you should think twice about spending $500 or more on a DX10.0 card. DX10.1 cards may be the better value proposition, if you want to run the latest games and don’t want to buy another $500 card six months from now. Nvidia’s new GPU generation, we hear, will also be 1.5 to 2 times faster than the current technology.
... Nvidia will also switch to GDDR5 memory, most likely within 2008. As GDDR5 chips are more available, we expect first Nvidia GDDR5 cards to hit the market in Q4.
TG Daily - Nvidia expected to offer DirectX 10.1 GPU in Q1 2009