The TCL 75P7K and TCL 75P8K are nearly identical on paper when it comes to their displays: both are 74.5″ QLED LED-backlit LCD panels running at 4K (3840 x 2160) resolution, with the same 59 ppi pixel density, 10-bit color depth, 1.07 billion colors, 350 nits typical brightness, full HDR suite support (HDR10, HDR10+, Dolby Vision, HLG), AMD FreeSync, anti-reflection coating, ambient light sensor, and wide 178°/178° viewing angles. In almost every display dimension, these two TVs are carbon copies of each other.
The single — but meaningful — differentiator is the refresh rate: the P7K runs at 60Hz, while the P8K steps up to 144Hz. In practice, a higher refresh rate produces noticeably smoother motion in fast-paced content. For everyday TV watching and movies (which are mastered at 24–30fps), the difference is negligible. However, for sports, action-heavy programming, and especially gaming, 144Hz translates to much crisper motion and significantly reduced motion blur. Paired with AMD FreeSync, the P8K's higher refresh rate also makes it a far more capable gaming display, as FreeSync can operate across a wider and more effective range at 144Hz.
The P8K holds a clear edge in this group solely because of its 144Hz refresh rate. For a pure movie-watching household, the gap matters little; but for gamers or anyone sensitive to motion smoothness, the P8K is the more capable panel. All other display attributes being equal, the refresh rate is the deciding factor here.