Pixel-shifting technology developed by Texas Instruments, called DLP Real 4K UHD Technology, allows projectors to reach true 4K resolution with 8.3 million individual pixels.
Moreover, the number of native pixels on the DMD chip is irrelevant to the genuine 4K resolution that XPR Technology achieves.
On the other hand, 4K-Enhancement Technology is quite limited and only produces 4.1 million pixels. It achieves this by doubling the base 1920×1080 pixel resolution. If you are paying hundreds of thousands of dollars, you might want to go for True 4K tech for a better experience.