[SOLVED] How To Get From 100hz to 120hz on AW3420DW?

[slyseparator]

I have an MSI R9 390 but the monitor came today and I am using the provided DP cable. I can't find documentation on max refresh rates with this card at max resolution. Just wondering if I am missing something here, as there is no option in the menu concerning refresh rate. I am upgrading cards in September but was hoping to hit 120 before then

 

[rgd1101]

hdmi or dp connection? what cable version?

 

[slyseparator]

hdmi or dp connection? what cable version?

DP connection. I am using the one the cable they gave me out of the box. Maybe it's cheap? DP 1.2

 

[slyseparator]

another piece of info - just got off the phone with a tech person from Alienware who told me my GPU's max refresh rate was 100Hz....i suppose that is possible at max resolution? I just didn't know the gpu would matter for refresh rate...

 

[Glenwing]

The R9 390 should support 120 Hz at 3440 × 1440. You may need to set a custom resolution. Use the instructions in section 6.3 here: https://forums.tomshardware.com/threads/how-to-connect-to-a-120-hz-display.3268285/

 

[slyseparator]

The R9 390 should support 120 Hz at 3440 × 1440. You may need to set a custom resolution. Use the instructions in section 6.3 here: https://forums.tomshardware.com/threads/how-to-connect-to-a-120-hz-display.3268285/

So I changed the timing standard to CVT - Reduced Blanking, the refresh rate to 120Hz, and kept the resolution at 3440x1440. When I set it from 100 to 120 in an attempt to make a custom resolution it changes the G Pixel Clock kHz value from 543600 to 652320. I cannot apply the setting as there is an exclamation point beside 652320 (below)

https://imgur.com/v3Ns2bk

View: https://imgur.com/v3Ns2bk


The only way I could save the custom resolution profile was to revert that number back to 543600 while keeping 120Hz in there. It saved the resolution setting in windows but the screen stayed black so I had to wait for it to revert to 100Hz to get my screen back again. I am at a loss, I really think it might be the cable that came with the AW3420DW at this point although that would be disappointing.

 

[Glenwing]

So I changed the timing standard to CVT - Reduced Blanking, the refresh rate to 120Hz, and kept the resolution at 3440x1440. When I set it from 100 to 120 in an attempt to make a custom resolution it changes the G Pixel Clock kHz value from 543600 to 652320. I cannot apply the setting as there is an exclamation point beside 652320 (below)

https://imgur.com/v3Ns2bk

View: https://imgur.com/v3Ns2bk


The only way I could save the custom resolution profile was to revert that number back to 543600 while keeping 120Hz in there. It saved the resolution setting in windows but the screen stayed black so I had to wait for it to revert to 100Hz to get my screen back again. I am at a loss, I really think it might be the cable that came with the AW3420DW at this point although that would be disappointing.

As far as I know the R9 390 supports up to 720 MHz pixel clock (720,000 kHz), so I'm not sure what the issue is here.

If the cable was limiting you it would be brought down to 360 MHz since a DisplayPort link only operates at discrete speeds.

 

[rgd1101]

try using dp.
look like the hdmi on the gpu is 1.4a

 

[drivinfast247]

Did you overclock the monitor in its settings menu?

 

[slyseparator]

Did you overclock the monitor in its settings menu?

There is no overclock on the 3420DW menu - it is 120Hz native. Only on the 3418DW model is the overclock option there under "game"

 

[drivinfast247]

There is no overclock on the 3420DW menu - it is 120Hz native. Only on the 3418DW model is the overclock option there under "game"

I see. Did you try using a (different) displayport cable?

Edit.

 

[Glenwing]

I see. Did you try using a displayport cable?

According to previous posts, yes.

 

[drivinfast247]

According to previous posts, yes.

Typo. Thank you.