New 4k tv accepting 4k 60hz from my gtx 770?

cinnamonandgravy

Limp Gawd
Joined
Jan 4, 2011
Messages
268
went to best buy to help my parents buy a new 4k tv (their old rear-projection based mitsubishi finally died).

best buy had a 43" sharp 4k tv with hdmi 2.0 for $425. i thought... 43" 4k @ $425?! :eek: and i bought it.

so i hook it up to my pc (gtx 770 which supports up to hdmi 1.4a) and lo and behold, i can enable 4k @ 60hz at YCbCr 4:2:0. no custom resolutions or anything. sure, im not getting full color, but when'd this happen? I thought 1.4a couldnt do 4k @ 60hz at all.

is the 770 actually outputting 60hz? i can select 30hz as well, but 60hz definitely feels much better (which makes me think it might actually be outputting 60hz).

what wizardry is this?
 

NickJames

Supreme [H]ardness
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Apr 28, 2009
Messages
6,679
Newer 4K displays can adjust the resolution and give u 60hz at 4:2:0 instead of 30hz 4:4:4 on HDMI 1.4. I think it was supported on a recent Nvidia Driver. Something about freeing up bandwidth on the HDMI 1.4 spec by downclocking the color profiles or something.
 

magnetik

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Staff member
Joined
Jun 6, 2000
Messages
5,803
went to best buy to help my parents buy a new 4k tv (their old rear-projection based mitsubishi finally died).

best buy had a 43" sharp 4k tv with hdmi 2.0 for $425. i thought... 43" 4k @ $425?! :eek: and i bought it.

so i hook it up to my pc (gtx 770 which supports up to hdmi 1.4a) and lo and behold, i can enable 4k @ 60hz at YCbCr 4:2:0. no custom resolutions or anything. sure, im not getting full color, but when'd this happen? I thought 1.4a couldnt do 4k @ 60hz at all.

is the 770 actually outputting 60hz? i can select 30hz as well, but 60hz definitely feels much better (which makes me think it might actually be outputting 60hz).

what wizardry is this?

NVidia driver finagling drops to 4:2:0 if on 1.4a. I own the same monitor I think. Another thing to try on that screen is overclocking. I am able to get mine up to 135-140hz @ 1080p.
 

cinnamonandgravy

Limp Gawd
Joined
Jan 4, 2011
Messages
268
good to know. definitely a nice surprise since 30hz is basically unusable for games.

hopefully i can get full 4:4:4 when i get a GPU with hdmi 2.0.

im already spoiled with 4k though. dont want to do 1080p, even with aggressive downsampling. if anything i need (somehow) to reduce input lag. even in game mode with all post-processing disabled its very high (~70ms or something).

im used to CRTs and plasmas (<1ms). but eh, for ~$400, maybe ill just use it for slower paced games.

ps its the sharp 43" UB30.
 
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