LG 34GK950G, 3440x1440, G-Sync, 120Hz

[PCM2]

I've been trying to test this myself, and I was wondering how you verify that the monitor is actually refreshing at 120 Hz?

• You can set the refresh rate to 120 Hz in Windows, because this is what the monitor reports to the driver as being supported - but that doesn't tell you what rate your monitor is actually refreshing at.
  
• You can use an FPS counter which reports how quickly the GPU is generating images - but that doesn't tell you what rate your monitor is actually refreshing at either.

The only simple way I'm aware of to verify this, is for the monitor to have a built FPS counter (and I don't have such a monitor).

What are your thoughts?

The monitor itself will usually report the refresh rate it's running at. If that or indeed the refresh rate selected in Windows matches up with what is reported on TestUFO and there is no frame skipping, that's the refresh rate. Plus you can usually set it to a lower refresh rate and see a difference or capture it with pursuit photography. And you can feel a difference if you're sensitive enough (I certainly can).

In this case, it's an AOC AG352UCG6 and there is no disputing it is working correctly at 120Hz. This isn't just some hopeful user-end overclock.

 

[Manne]

Thanks for all the info. @Stu you should update the first info page to that it has 120Hz native right?

 

[Stu]

Thanks for all the info. @Stu you should update the first info page to that it has 120Hz native right?

Already did that yesterday

Update - I missed a couple of bits yesterday, so I've just tidied it up further.

 

[Daniel - LG]

Glad I could help

 

[ChrisPyzut]

Heard somewhere that Nvidia won't authorize use of their DP1.4 module unless the monitor is HDR10 certified or something like that. Could be why the UM5 won't have DP1.4.

Would be nice if Nvidia could let this one slide and let us have it in the 950G

 

[a5cent]

The monitor itself will usually report the refresh rate it's running at. If that or indeed the refresh rate selected in Windows matches up with what is reported on TestUFO and there is no frame skipping, that's the refresh rate. Plus you can usually set it to a lower refresh rate and see a difference or capture it with pursuit photography. And you can feel a difference if you're sensitive enough (I certainly can).

In this case, it's an AOC AG352UCG6 and there is no disputing it is working correctly at 120Hz. This isn't just some hopeful user-end overclock.

Okay, that was very helpful. Thank you very much!

 

[a5cent]

The formula I have seen is resolution x refresh rate x 3 x color depth = bandwidth. So it would be 3440 x 1440 x 120 x 3 x 8 = 14.27 GB/s without any overhead.

This is well below the 17.28 GB/s that VESA states. However is that formula correct?

Hey ChrisPyzut

I was really tired last night and probably shouldn't have been posting in that state.

With the exception of the unit (Gbit/s), that formula tells you how much bandwidth your video payload requires. As such it is correct. However, it doesn't account for the additional stuff DP piggy-backs ontop of that payload, specifically HBI (horizontal blanking interval) and VBI (vertical blanking interval).

AFAIK, for DP 1.2 HBI is always 80, but VBI varies, based on vertical resolution and refresh rate. For 3440x1440@120Hz, VBI = 85, so

(3440 + 80) x (1440 + 85) x 120 x 3 x 8 = 15.46 Gbit/s

On Wikipedia you can find a list of DisplayPort resolution and refresh frequency limits. There you can find an entry for 2560x1440@120Hz, which has the same VBI. Plug in in the numbers and you get:

(2560 + 80) x (1440 + 85) x 120 x 3 x 8 = 11.59 Gbit/s = same as the bandwidth listed in that table

 

[a5cent]

While we're at it, for 3440x1440@144Hz, VBI = 103, so:

(3440 + 80) x (1440 + 103) x 144 x 3 x 8 = 18.77 Gbit/s

Which is why LG is correct to say that we can't reach 3440x1440@144Hz using DP 1.2 (as that is limited to 17.28 Gbit/s).

 

[ChrisPyzut]

As long as I can do 120hz with no issues, I'm set for now.

Thanks for that detailed explanation, a5cent

 

[ChrisPyzut]

https://www.tweaktown.com/news/62226/amd-radeon-rx-680-navi-10-gpu-gddr6-2019/index.html

"Well, the Radeon RX 680 according to my sources will be powered by the Navi GPU architecture and feature 8GB of GDDR6 memory, with the performance of the GTX 1080 to GTX 1080 Ti or so. We should expect a price of somewhere in the $299-$399 range, and will battle the GTX 1080 Ti at higher resolution games because of its faster GDDR6 RAM. I talked to some industry sources over the last few months, and then some new ones at Computex 2018 that told me Navi wouldn't be here until at least half way through 2018."

Just in time for the 950F Lol. Might honestly hold out, though I've had a bad experience with Freesync and my MG279Q.

 

[Stu]

Heard somewhere that Nvidia won't authorize use of their DP1.4 module unless the monitor is HDR10 certified or something like that. Could be why the UM5 won't have DP1.4.

Would be nice if Nvidia could let this one slide and let us have it in the 950G

The new GSync modules with DP1.4 are the ones in the new > £2000 monitors... I'm sure these demand a price premium, and I'm perfectly happy to accept 120Hz right now.

https://www.tweaktown.com/news/62226/amd-radeon-rx-680-navi-10-gpu-gddr6-2019/index.html

"Well, the Radeon RX 680 according to my sources will be powered by the Navi GPU architecture and feature 8GB of GDDR6 memory, with the performance of the GTX 1080 to GTX 1080 Ti or so. We should expect a price of somewhere in the $299-$399 range, and will battle the GTX 1080 Ti at higher resolution games because of its faster GDDR6 RAM. I talked to some industry sources over the last few months, and then some new ones at Computex 2018 that told me Navi wouldn't be here until at least half way through 2018."

Just in time for the 950F Lol. Might honestly hold out, though I've had a bad experience with Freesync and my MG279Q.

GTX 1080 performance for less than $400 in 2018, and from AMD... I'll only believe that when I see it!

 

[Stu]

How's the wait going guys? Alienware lands tomorrow

How is the Alienware?

 

[Panos]

The new GSync modules with DP1.4 are the ones in the new > £2000 monitors... I'm sure these demand a price premium, and I'm perfectly happy to accept 120Hz right now.
GTX 1080 performance for less than $400 in 2018, and from AMD... I'll only believe that when I see it!

The quote is wrong. Is 2H 2019 not 2H 2018.

 

[Stu]

The quote is wrong. Is 2H 2019 not 2H 2018.

So actually, AMD will release Navi in 2H 2019 with the performance of a GTX 1080 that was released in 1H 2016?

I'm not sure that there's much to celebrate here... also, I'm sure Nvidia will have new cards out in 2H 2019 to compete!

 

[Stu]

https://www.tweaktown.com/news/62226/amd-radeon-rx-680-navi-10-gpu-gddr6-2019/index.html

"Well, the Radeon RX 680 according to my sources will be powered by the Navi GPU architecture and feature 8GB of GDDR6 memory, with the performance of the GTX 1080 to GTX 1080 Ti or so. We should expect a price of somewhere in the $299-$399 range, and will battle the GTX 1080 Ti at higher resolution games because of its faster GDDR6 RAM. I talked to some industry sources over the last few months, and then some new ones at Computex 2018 that told me Navi wouldn't be here until at least half way through 2018."

Just in time for the 950F Lol. Might honestly hold out, though I've had a bad experience with Freesync and my MG279Q.

Lol, that quote changes complexion if you include the very next sentence!

Well, the Radeon RX 680 according to my sources will be powered by the Navi GPU architecture and feature 8GB of GDDR6 memory, with the performance of the GTX 1080 to GTX 1080 Ti or so. We should expect a price of somewhere in the $299-$399 range, and will battle the GTX 1080 Ti at higher resolution games because of its faster GDDR6 RAM. I talked to some industry sources over the last few months, and then some new ones at Computex 2018 that told me Navi wouldn't be here until at least half way through 2018. Another source said that it would not be that great, in the way that it will not be a successor to Radeon RX Vega at first, but rather the Radeon RX 680 powered by Navi 10.

 

[Panos]

So actually, AMD will release Navi in 2H 2019 with the performance of a GTX 1080 that was released in 1H 2016?

I'm not sure that there's much to celebrate here... also, I'm sure Nvidia will have new cards out in 2H 2019 to compete!

For the mid range prices of a GTX1060/RX580, so basically it will double the grunt power of the mid range cards, and shows actually how powerful the next gen of consoles will be.

As for Nvidia they might delay until 2019 also.
If you have someone like one of the big Taiwan 3 (Gigabyte, Asus, MSI) returning 300,000 Pascal GPUs back to Nvidia as is on the news today, having already created such a big inventory of cards that cannot be shipped, you do not churn out new products.

No wonder NV boss said that there are no new gaming cards for long time.

With just a Pascal refresh in the works, a stupid stock of GPUs and already made cards, and an even bigger stock of used cards hitting the likes of ebay, the worst business decision is to launch a new product.

Because do not expect anything better than the new GTX1180 (or what ever) be between 1080 and 1080Ti performance.

 

[ChrisPyzut]

Lol, that quote changes complexion if you include the very next sentence!

Please, just let me hope!

 

[Stu]

Acer X34P advertised for £699 elsewhere... so tempting... can't decide now that we know the 950G will have the newer panel, as the risk of buyer's remorse is there...

 

[Daftbrown]

Acer X34P advertised for £699 elsewhere... so tempting... can't decide now that we know the 950G will have the newer panel, as the risk of buyer's remorse is there...

I'm in rather the same boat.

@Daniel - LG - Any update on a release date for these monitors? Thanks.

 

[Stu]

Looking at recent trends, I suspect the X34P will hit this price again over the coming months. It really does put the pressure on the 950G, which needs to be significantly better to justify a higher price.