Custom Resolution Utility (CRU)

[dinsum]

(06-15-2015 10:28 PM)ToastyX Wrote:  

(06-14-2015 05:28 PM)dinsum Wrote:  Hi,

Im using this program to try and get 120hz refresh rate with my LG 49UB8500 TV @ 1080P resolution, I have a r9 290x videocard with a $2 HDMI cable 6 feet long

75hz works good, i tried 92hz and 100hz, both didn't work, tv said invalid format, I tried setting it to 120hz and it works but only uses a 1/4 of the screen, i attached a picture to show what I mean, you can see there is weird artifacting on some parts of the screen as well

I unlocked my drivers for 300mhz pixel clock

Even though it only fills the top left of the screen it is actually displaying at 120hz, it feels very snappy and games run at 120fps with vsync on

I also attached a picture showing the settings I choose when I made the custom resolution, i basically left everything default but just changed the refresh rate, is there more that I need to do or things I can try to get it to fill the screen properly? Could it possibly be my cheap HDMI cable causing the problem?

Thanks for any suggestions!

Those are the standard HDTV timing parameters for 1920x1080 @ 30/60/120 Hz. You shouldn't need the patch with HDMI. Are you using the default extension block? If you're using a custom extension block, you need to add an HDMI support data block in the extension block. If that doesn't help, then the TV probably doesn't support 1920x1080 @ 120 Hz.

Yeah im not using a custom resolution block so I guess im out of luck, one thing to point out though is to get 4k@60hz 4:4:4 color with this TV you need to turn on Deep Colour but it does not allow me to turn it on because I currently don't have an hdmi 2.0 videocard or because of this cheap hdmi cable, i remember reading in the manual for the tv if you plan on turning on deep colour you should use the high quality hdmi cable that comes with the tv but since i got the tv refurbished there was no hdmi cable, I think maybe with deep colour on it allows more bandwidth for the tv which might allow me to choose 120hz

I've read reports of the lower model LG 40ub8000 tv being able to do 120hz@1080p and that tv cant even do 4k@60hz 4:4:4, it drop it down to 4:2:0

Ill do some tests in the future when im able to turn deep color on to see if I can get the 120hz working