Iiyama GB3466WQSU-B1 Curve (1500R) 34” 1440 144Hz VA panel FreeSync Premium Pro

Pocket10s said:
Does yours make a audible kind of "whine"? I'm using the DP cable that came with the monitor; thinking to buy another.
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it’s worth a try - the audio does seem to be linked with it - as a few people here have experienced popping along with the flicker.

Worth the try, and return the cable if it doesn’t improve.
 
Hi all

I thought I'll share my experiences to help others.
I bought the monitor about a month ago and noticed the flickering in 3D games. Especially visible on the loading screens (I've tried WoW, PoE).
Based on the information in this thread it was already on the newer firmware. I've tried changing various settings like the output frequency or colour format. I've also tried a high quality cable, 1.2, 1.4 setting - nothing helped.

I called the service last week and they've told me that they have even newer firmware and will do the upgrade so I sent the monitor to the repair centre.
I received it back today. Unfortunately the flickering is still there. I think even worse than it was.

Regarding the newest firmware - the boot screen seems to be exactly the same.
I'll let you know if I find out more.
 
I do wonder about the service place — after questioning them about having the new firmware... they still wanted to take it in.

They aren't Iiyama and must surely make money on the number of units they repair/service etc
 
Robert Noguera said:
Can anyone confirm if the display port are 1.4? on displayspecifications said 1.2
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I think the included one is 1.2, i switched it out for a 1.4 and noticed some improvements. But like others in some other newer games i've tried theres flickering in the menu's mostly where the FPS is either way higher than the refresh rate or way lower..
 
Now they are telling me that the issue might be caused by a graphics card or a cable. I had tried one already and it didn't help but maybe I was just unlucky.
Can anyone recommend a good cable?

Thanks.
 
This just turned up today; looks good so far. I haven't bothered enabling Freesync in the menu settings though as it's enabled via Radeon software (has anybody else just done the same?). Also, what settings are you all using? I haven't noticed any flickering as of yet, but I guess it's early days. I didn't bother using the new cable they provided - just the old one from my AOC AG241QX
 
The Radeon software can control the monitor setting? I thought you had to turn it on in the monitor — what does the OSD say when you do that from software? (in the image adjust menu items)
 
Hey guys

thought I’d add, I’ve spoken with Iiyama and there is a fault where the monitor doesn’t allow the Xbox Series X to use 1440p resolution, only 1080p, so when you try to set the image display mode it won’t display correctly.

I know this isn’t the common use case for most of you but it’s worth knowing, as I wanted to use this monitor for my Xbox in 1440p at 120hz and it isn’t supported (assume an issue with the firmware and hdmi input)
 
jcarruthers said:
The Radeon software can control the monitor setting? I thought you had to turn it on in the monitor — what does the OSD say when you do that from software? (in the image adjust menu items)
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I think it's just in game, but I guess does freesync matter too much on the desktop? I just go onto the "Gaming" tab...AMD Freesync is on the right hand side and just set it to "On". The Freesync option on the monitor it still set to off. Tbh I don't notice a difference then whether that is set to on or off so guess Freesync is definitely working. I don't recall my AOC AG241QX having a freesync option, and never really messed about in the settings too much to find out if it did. I'm running a Sapphire Nitro+ 5700XT if that helps.

Strangely, Skyrim does have an entry, but not SkySE64/Mod organiser 2, but I don't notice screen tearing so assumed freesync was somehow enabled on that. Weird.

Ok I noticed that in Global settings that it said Freesync wasn't supported by my display until I enabled it in the OSD on the monitor. Truth be told, I don't notice a difference with it enabled or disabled on there. :\
 
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Ah I've just realised that the DP cable im using from the AOC monitor is 1.2. I'm definitely getting slight flickering when freesync is on on the monitors settings. I'll try ordering a 1.4 cable as I'm guessing 1.2 isn't enough
 
I've ordered the VESA certified KabelDirekt 8K cable and still see the flickering. It's gone when FreeSync is off.
If you want to use FreeSync - don't buy this monitor. There is something really wrong with this model.
 
I've been playing Crimes and Punishment today (with the directx9 flag added) and haven't really noticed any flickering (or it wasn't obvious if it was there), yet I did in Skyrim special edition. I've been very happy with this screen so far, but the flickering does seem random to me :\

I wonder if it's more some incompatibility or issues with Direct X or AMDs drivers? Other than that, it's a very good monitor for the price, and certainly a step up colour wise from my AOC AG241QX that I was using.
 
I don't think it's driver specific.

I found the following explanation:
https://www.displayninja.com/what-is-freesync-brightness-flickering/

AMD:
If your gaming monitor has a variable refresh rate range of 48-144Hz, it will trigger LFC (Low Framerate Compensation) once your FPS (Frames Per Second) rate hits 47FPS or less if you an AMD graphics card.
LFC multiplies your framerate in order to eliminate tearing even when your FPS dips below the monitor’s VRR range. For instance, at 47FPS, it gets tripled to 141Hz.
So, let’s say one second you have 48FPS, and therefore, 48Hz, and then, the next second, your FPS drops to 47FPS, and your refresh rate spikes up to 141Hz.
Because your monitor is brighter at higher refresh rates, brightness oscillates.
If your FPS is constantly around 48FPS, LFC rapidly goes on and off – thus causing brightness flickering.

NVIDIA:
When using FreeSync with a compatible NVIDIA graphics card via the G-SYNC Compatible mode, LFC behaves a bit differently than it does with AMD cards.
LFC gets triggered regardless of the monitor’s FreeSync range.
So, if your monitor has a 120-144Hz VRR range, and you’re getting 60FPS, the monitor’s refresh rate will change to 120Hz whereas with AMD cards, LFC wouldn’t work, and you’d get fixed 144Hz (or 60Hz if VSYNC is enabled).
Further, the LFC threshold is usually different when using an NVIDIA GPU. For instance, with many 48-144Hz FreeSync monitors, LFC kicks in at around 60FPS with NVIDIA cards!
Due to this, FPS fluctuations around the LFC threshold will cause the monitor to rapidly go up and down with refresh rates thus causing brightness flickering.
Click to expand...

That would explain why you see this in some games only.
 
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