Maximum Resolution for prospective 'retina' screens

hope hasn't been brought before, here goes:

following assumes between , when new 'retina' displays introduced next month or so, thunderbolt spec won't updated.

maximum useful throughput (goodput) current tb spec 8gbit/s per direction/per channel (8b/10b encoding). below displayport 1.0/1.1 spec of 8.64gbit/s.

means there ceiling on size of display can driven thunderbolt cable. , seeing tb display apple's flagship external display, see updates resolution, matching, or @ least exceeding other displays available in apple's range. if apple's brand new 'universal port' spec championed, , had headstart with, couldn't work new high resolution updated tb display, why bother updating display resolutions @ all.

so, out of way, maximum resolution is:

3072 x 1728.

60 fps * (3 * 8) bit colour * 3072 * 1728 = 7.644 gbit/s.

sheer speculation, grounded in form of logic. there's nothing stopping apple using 'retina' displays in internal screens beyond size above, me doesn't sit right. suppose new mac pro released , apple sells these new 5120x2880 tb displays you're forced run them @ 2560x1440 because that's tb can supply. argue gpu's in them have own later spec displayport drive them @ full res...but no spec handles amount of data.

how data?

60 fps * (3 * 8) bit colour * 5120 * 2880 = 21.23 gbit/s. you'd need 2 hdmi 1.4 spec cables, or 3 tb cables power beast.

 

displayport 1.2 has throughput of 17.28gbps. supports 60hz * 30bpp * 3840 * 2160 = 14.9gbps. new zotac geforce® gtx 680 has displayport 1.2 output , supports 3840x2160 resolution. technically apple release 4k imac now, need add dp1.2 port or respec thunderbolt use dp1.2.

 

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