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How to overclock G-Sync (Bonus: Unlocked Glitch State)

Talk about overclocking displays at a higher refresh rate. This includes homebrew, 165Hz, QNIX, Catleap, Overlord Tempest, SEIKI displays, certain HDTVs, and other overclockable displays.

How to overclock G-Sync (Bonus: Unlocked Glitch State)

Postby lexlazootin » 16 Oct 2016, 01:52

I was having trouble getting this to work but i finally nutted it out.

Standard G-Sync Overclocking

When overclocking G-Sync on my XL2420G (Maybe all 1080p G-Sync monitors) there are only three things you have to look at, the Refreshrate, Total Horizontal Pixels and the Pixel Clock. The Front porch and Sync width can be what ever they like as long as they are low enough to not steal all the bandwidth and the Vertical Total HAS to be Active Vertical +18.

Now when adjusting the timings to get a new refreshrate you need the pixel clock to be BETWEEN

319.5 - 329.5

if it goes outside of any of these variables the monitor will simply black screen. So what you have to do is lower your Horizontal Total and raise your Refreshrate trying to stay BETWEEN those variables.

http://i.imgur.com/F9RewNt.png

This alone i was able to get 153hz before frame skipping. I'm able to crack it to 198hz using this technique.

http://imgur.com/HuMxPL1

I left the Vertical Timings 3 and 5 because G-Sync wasn't working correctly when they were left at 1. I don't understand why, but adjusting the Active Horizontal and Vertical didn't let me get any higher of a overclock, it would just frame skip at 154hz again.

Unlocked Glitch State

Imagine what if we could adjust the Vertical Total and go WAY above the pixel clock. Well you can, sort of. To enter this 'Glitch' state you need a few things set in the timings.

The resolution NEEDS to be:

800 x 600 to 610
or
1024 x 768 to 778

And the Pixel clock need to be OUTSIDE of the standard Pixel clocks i mentioned earlier.

-230
240 - 280
290 - 319.5
+329.5

It will look something like this: http://imgur.com/xXeQBo8

I get 196hz before it craps out. Again i use 3 and 5 for G-Sync and i raised the Vertical total because there was a tearline going through my screen and raising by that much fixed it, it's dependent on the Refreshrate and the Active Pixels.

So i hope you found that interesting and wasn't too hard to follow! I really want to find more resolutions that work, i need one that's close to 1080.
Last edited by lexlazootin on 16 Oct 2016, 20:32, edited 2 times in total.
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Re: How to overclock G-Sync (Bonus: Unlocked Glitch State)

Postby Falkentyne » 16 Oct 2016, 02:11

May I ask a question?

Are you able to do anything like this with the classic (Mstar) Scaler ? E.g. regular Z series stuff...

Because I swear anything above 145 hz just black screens no matter what I do...but I haven't tried your tricks yet...
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Re: How to overclock G-Sync (Bonus: Unlocked Glitch State)

Postby lexlazootin » 16 Oct 2016, 03:03

I'm pretty sure the classic board has it's own criteria for overclocking, i was only able to get 146 from my short play with it.
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Re: How to overclock G-Sync (Bonus: Unlocked Glitch State)

Postby AustinClark » 16 Oct 2016, 15:43

Interesting. This is the first time I've heard about G-Sync overclocking (beyond the factory-enabled stuff).

I have a 1440p 144Hz G-sync monitor. Are the 1080p monitors different somehow? I thought I tried overclocking it once before, but couldn't get it to budge at all.
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Re: How to overclock G-Sync (Bonus: Unlocked Glitch State)

Postby lexlazootin » 16 Oct 2016, 20:34

AustinClark wrote:Interesting. This is the first time I've heard about G-Sync overclocking (beyond the factory-enabled stuff).

I have a 1440p 144Hz G-sync monitor. Are the 1080p monitors different somehow? I thought I tried overclocking it once before, but couldn't get it to budge at all.


Idk, but you should give it ago. with all the extra bandwidth you get i'm really curious on what the results will be.
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Re: How to overclock G-Sync (Bonus: Unlocked Glitch State)

Postby lexlazootin » 19 Oct 2016, 07:22

Ah nuts, It looks like the overdrive is incorrect when it's overclocked. I might have a bit more of a play with it.
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Re: How to overclock G-Sync (Bonus: Unlocked Glitch State)

Postby click4dylan » 08 Jan 2017, 19:50

My XB240H works at 153 Hz as well (and 154 hz with frameskipping). The monitor itself says 144hz though in the menu. So I'm not sure what to believe. The 198hz has always worked when using 'CVT Reduced Blank' which then the monitor DOES say 198hz in the menu
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Re: How to overclock G-Sync (Bonus: Unlocked Glitch State)

Postby daninthemix » 05 Sep 2017, 11:04

Don't suppose you have any advice for overclocking a 60hz g-sync display do you? :D

It won't even accept a custom res of 61hz using the automatic settings...
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Re: How to overclock G-Sync (Bonus: Unlocked Glitch State)

Postby lexlazootin » 05 Sep 2017, 12:18

daninthemix wrote:Don't suppose you have any advice for overclocking a 60hz g-sync display do you? :D

It won't even accept a custom res of 61hz using the automatic settings...


Yea, i saw your post. It's a 4k right?

Without specifics it's hard to help someone do this. It's a bunch of problem solving, figuring out why something can change and what you need to change to go further. Although the OP was poorly written you can still get some info from it to try.

I did some further overclocking with my 240hz G-Sync, you can read it in this thread, it's almost the same as this one with some variables switched around. (what's locked and not locked.)

viewtopic.php?f=2&t=3490
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Re: How to overclock G-Sync (Bonus: Unlocked Glitch State)

Postby kalston » 05 Sep 2017, 20:31

Huum, wondering if this could me help create a custom 90hz refresh on my Rog Swift? I'll have to try when I get home.

This is purely to achieve perfect sync with my Oculus Rift when using Virtual Desktop. I've had no luck so far and I'm a sucker for perfect smoothness (g-sync user since day one) so when VD is capturing my monitor running at 144/120/100/85/60hz and turning it into 90hz it bothers me.
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