Sapphire Radeon HD 5870 1GB GDDR5 Review

by Michael "SKYMTL" Hoenig     |     September 22, 2009

A Focus on DX11

It has been a hair under three years since the release of Windows Vista and with it the DirectX 10 API. In that amount of time, a mere 33 DX10 games were released. That isn’t exactly a resounding success considering the hundreds of titles released in that same time. Let’s hope DX11 does a bit better than that.

DX11 is focused on taking the lessons learned from the somewhat inefficient DX10 and shaping them into a much more efficient API which will demand less system resources while being easier to develop for. In addition to the usual 3D acceleration, it will also be used to speed up other applications which in the past have not been associated with the DirectX runtime. This may be a tall order but with the features we will be discussing here, developers have already started using DX11 to expand the PC gaming experience. It is an integral component in Windows 7 and according to Microsoft, will also be adopted into Windows Vista through a software update.

Let’s scratch the surface of what DX11 can bring to the table.

Unlike past DirectX versions, DX11 endeavours to move past the purely graphics-based uses of the API and push it towards being the lynchpin of an entire processing ecosystem. This all begins with the power which DirectX Compute will bring into the fold. Not only can it increase the efficiency of physics processing and in-game NPC intelligence within games by transferring those operations to the GPU but it can also be used to accelerate non-3D applications.

Through the use of Compute Shader programs in Shader Model 5.0, developers are able to use additional graphical features such as order independent transparency, ray tracing, and advanced post-processing effects. This should add a new depth of realism to tomorrow’s games and as mentioned before, also allow for programs requiring parallel processing to be accelerated on the GPU.

For the majority of you reading this review, it is the advances in graphics processing and quality that will interest you the most. As games move slowly towards photo-realistic rendering quality, new technologies must be developed in order to improve efficiency while adding new effects.

Some of the technologies that ATI is championing are DX11’s new Depth of Field, OIT (or Order Independent Transparency) and Detail Tessellation. While the pictures above do a good job of showing you how each of these works, it is tessellation which ATI seems most excited about. They have been including hardware tessellation units in their GPUs for years now and finally with the dawn of DX11 will these units be finally put to their full use. OIT on the other hand allows for true transparency to be added to an object in a way that will be more efficient resource-wise than the standard alpha blending method currently used.

Let’s talk about DX11 games. As you would expect, due to the ease of programming for this new API and the advanced tools it gives developers, many studios have been quite vocal in their support. Even though some of the titles listed above may not be high on your list of must have games, A-list titles like the upcoming Aliens vs. Predator from Rebellion and DiRT 2 are sure to get people interested. What we like see is at least three DX11 games being available before the Christmas buying season even though BattleForge is already available and will have DX11 support added through a patch.

Another exciting addition to the list is EA DICE’s FrostBite 2 Engine which will power upcoming Battlefield games. Considering the popularity of this series, the inclusion of DX11 should open up this API to a huge market.


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