Core i7 4790K Processor Review - Performance - DXVA MKV 1080P & Ultra HD Video Playback

Accelerating & Enhancing Video

CPU with integrated GPU based platforms are a lot about additional features and performance on top of regular processing. So another key feature is of course the embedded GPU with video processor. The combo of the video processor and some additional shader processors inside that chipset allows for high-definition 1080P content playback, acceleration, and though limited... enhancement of overall picture quality. For those that use other content like the immensely popular MKV / x.264 container formats, please download Media Player Classic Home Cinema. This free open source software will DXVA accelerate and enhance your MKV content at 1080P or even higher. We have written an article on Media Player Classic Home Cinema and how to set up that software to make this happen, please read that here. 
 

Above an example of 1080P, a concert from Muse in MKV x.264 format - there is no dedicated graphics card installed, so this is the Intel 4600 iGPU at work here and quite frankly it does the job extremely smooth. You'll notice a CPU load of up-to 2% here, power consumption at this stage was roughly 55~65 Watts for the entire PC. We have some extra shaders enabled like complex Image Sharpening. Perfect playback. But let's disable DXVA and try Ultra HD playback.

In the above example we tested Ultra HD content playback. Above the 4K resolution Elysium trailer, here we have an MP4 H.264 file and you can see that the CPU load is 16% with one to two cores showing more utilization. Unlike many APUs we recently tested, Ultra HD video-playback did not result into stuttering, and that is a good thing. Here as well we have additional shaders enabled like image sharpening and darkened black levels. These shaders run over the iGPU.

Normally the reason why we notice stuttering is that the trailer is not DXVA encoded, or DXVA at 4K does not yet work. So then the processor cores will kick in and only IF they can handle the content fast enough this will be a successful mission. The Core i7 4970 was plenty fast for this job, as expected.