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Intel: DirectX 12 yields big gains on tablets, other thermally constrained devices

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"We already know that DirectX 12 will reduce CPU utilization in games by cutting API overhead. The performance benefits of this approach on desktop PCs are self-evident, but as Intel showed at Siggraph this week, DX12 will pay particularly strong dividends on thermally constrained devices like tablets.

On those devices, cutting CPU utilization will free up part of the limited power and thermal budget so that it can be spent on graphics. The result, then, won't just be better performance with lower-clocked CPUs. Users will also get to enjoy stronger overall GPU performance.


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Intel's Andrew Lauritzen demonstrated those gains using a Surface Pro 3 tablet and a specially crafted software demo. The demo, pictured above, renders a scene with "50,000 fully dynamic and unique asteroids," and it can switch from DX11 to DX12 mode "at the tap of a button." The demo also shows CPU and IGP power consumption in a graph at the bottom right.

In DX11 mode, the Surface Pro 3 runs the demo at a sluggish 19 FPS. As the graph shows, the CPU eats up a sizeable chunk of the power budget. But in DX12 mode, the IGP gets a larger piece of the pie, and the frame rate climbs to a much more fluid 33 FPS. That works out to a 74% jump in rendering performance.

"The main takeaway," Lauritzen explains, "is that power and performance are inseparably linked. Conventional notions of 'CPU vs. GPU bound' are misleading on modern devices like the Surface Pro 3. An increase in CPU power efficiency can be used for more performance even if an application is not 'CPU bound'."

That observation doesn't just apply to tablets. One can easily see how, by cutting CPU usage, DX12 could enable faster graphics performance on a mini-PC like Gigabyte's Brix Gaming BXi5G-760, which frequently buts up against its thermal ceiling. DirectX 12 will also run on smartphones, where working around thermal and power constraints will be particularly important."


http://techreport.com/news/26916/in...n-tablets-other-thermally-constrained-devices
 
It will also mean that on Desktops you can spend less on CPU's to spend more on descrete GPU's ending up with a better result.

Can't see Intel bragging about that. :)
 
It will also mean that on Desktops you can spend less on CPU's to spend more on descrete GPU's ending up with a better result.

Can't see Intel bragging about that. :)

It could however allow Intel to dedicate more die space to the IGP and push up into midrange territory.
 
It will also mean that on Desktops you can spend less on CPU's to spend more on descrete GPU's ending up with a better result.

Can't see Intel bragging about that. :)

Thats what I was hoping for.

My 4770k crapped itself so went and bought a 4690k instead as it was cheaper and I believed (or hoped) that in the future Mantle and DX12 will help.

Mantle does to a certain extent in BF4 however the memory bug in it is killing me at the moment
 
It also means AMD does better too,since they tend to have weaker CPUs and much more powerful GPUs. Their CPUs also tend to be more thermally constrained than Intel ones too.

This release is designed to resolve the performance deficit between the ps4 and Xbox one.

You could argue that there is a bigger gap than expected between these two consoles as the ps4 is running a flavour of mantle and the Xbox is running a version of Dx based on dx11.

The Xbox one ticks all the big boxes for the use cases of dx12 namely, thermally constrained environment, multiple cores and CPU limited throughput.

Whether it can deliver the 20% performance increase required to level the game with the ps4 will be interesting to see. I can imagine the Xbox team taking a risk with dx12 before it's ready for windows 8.
 
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This release is designed to resolve the performance deficit between the ps4 and Xbox one.

They won't achieve that without a hardware recall, the deficit is more like 50% on the GPU side which is why PS4 is generally pushing 50% more pixels (900P 1.4M pixels v 1080P vs 2.1m pixels).

I would expect that Xbox One will gain little from it anyway as it should already have low level support.
 
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