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At this juncture, we had to switch sources in order to get native 4K. This was served up by an ASUS gaming PC containing a Radeon HD 7970 -- AMD's flagship graphics card that can throw a 4K signal out of its HDMI 1.4 port. According to the rep, NVIDIA's GeForce GTX 680 can't quite manage this out of the box. In the close-up shots, the impact of going native is obvious compared to upscaled, and it was also very apparent when sitting three meters away from the screen. When viewing from six meters away, the difference between native and upscaled was there but it was subtle -- it was just a sense of the image being sharper and more natural at the edges of objects. The difference between native 1080p and native 4K at six meters, however, was more marked -- it could only be described as 'subtle' at a distance of nine meters from the screen.