3 ms·4K is 2160p. Digital theater 4K is 4096x2160 but UHDTV 4K is 3840x2160. 8K is 4320p. UHD 8K is 7680×4320.by ianburrell 10y ago4K is 2160p. Digital theater 4K is 4096x2160 but UHDTV 4K is 3840x2160. 8K is 4320p. UHD 8K is 7680×4320.