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ACER XG270HU Maximmum 120hz at 1440p

post #1 of 11
Thread Starter 
I have a problem with my graphics card, i cannot get 1440p at 144hz, i cannot create a custom resolution of 1440p 144hz (2560x1440), i can test te resolution using NVIDIA CONTROL PANEL, but it won't save, i cannot use it.

My graphics card is a Gigabyte GTX 670 Windforce OC 2 GB, and my monitor is ACER XG270HU.

I have already tried, installing the acer driver, reinstaling the NVIDIA drivers with safe mode uninstaling, twice, and tried forcing custom resolution with CRU program, and still, nothing seems to work.
post #2 of 11
you're creating an invalid refresh rate that falls out of specification.
144hz uses reduced vertical blank. You can GPU scale it if you're using proper timings, but you cant use normal timings. Reduced Vblank only (reduced VT).

If you're using the Nvidia control panel, make sure you select "reduced blanking" or "CVT reduced" or "LCD Reduced." I don't have an Nvidia card nor do I use the Nvidia control panel so I don't know what the options are.

In toastyX CRU its called LCD Reduced.

Attempting to create a normal 144hz refresh rate on monitors that not overclock with normal timings will show an out of range error.

Some monitors can use the 144hz reduced blanking timings all the way up to 200 hz (a few Qinx monitors that are not firmware locked).
(e.g. http://www.ebay.com/itm/Perfect-Pixel-QNIX-QX2414-144Hz-24-LED-1920x1080-Full-HD-FPS-Gaming-PC-Monitor-/121696946784
and http://www.ebay.com/itm/Perfect-Pixel-QNIX-QX2414-LED-144-FHD-24-inch-Full-HD-144Hz-24-Gaming-Monitor-/111657800658 )

But those are 1080p panels.

Notice the 1098 vertical total (VT?) (This is the 144hz reduced blank for 1920x1080). These panels overclock to 180-240 hz because the firmware isn't locked to prevent it.
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post #3 of 11
Thread Starter 
Yes, but my acer is rated at 1440p 144hz from the get go.

http://www.newegg.com/Product/Product.aspx?Item=N82E16824009769

This the one, and i do not understand why it won't have a default setting of 1440p 144hz, as you see in the review posted below they were able to get 144 hz with no fuss.

http://www.tftcentral.co.uk/reviews/acer_xg270hu.htm

I use a Display Port cable, the one that was provided with the monitor, but i also tried a dual link DVI and still the same results
gara2.jpg 172k .jpg file
gara3.jpg 163k .jpg file
gara4.jpg 139k .jpg file
post #4 of 11
You can't run 144hz over dual link at 1440p. It exceeds the TMDS specifications wildly, even if you use the pixel clock patcher.
I can't even go 115hz over dual link DVI at 2560x1440; the screen simply shuts off, however over displayport, 2560x1440@115hz works no problem as an overclock (I'm using a 1920x1080 panel, btw).

Over displayport, use toastyX CRU and try creating a 2560x1440 LCD Reduced (not automatic) 144hz edid override.
You are using a gsync monitor so all resolutions lower than native will be gpu scaled.
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post #5 of 11
Thread Starter 
I will try, but my original question was, why doesn't it work out of the box, like it should, i mean, the guys in the review managed and they didnt do anything special, they just plugged it in.

It's a freesync monitor, it doesn't have gsync.

I don't understand why windows doesn't have this 2560x1440 at 144 hz by default ?
post #6 of 11
There are two main reasons this might happen.

1) you need to do a complete driver uninstall with display driver uninstaller (DDU).
http://www.wagnardmobile.com/forums/viewforum.php?f=5&sid=11dfa9fe5a253dde2408a0ffbce358ba
There HAVE Been reports of people with normal 1080p DVI systems not able to run at higher than 60hz with proper dual link cables, until they ran DDU and reinstalled (some VG248QE users who came from previous monitors had this issue, and some others).

2) the DP cable that came with the XG270HU is substandard and can't run at full link speed at 144 hz.

#2 has been a common problem with people with both Benq XL2730Z's and Asus ROG Swifts. There were a lot of reports of people who could not run at 144hz until they bought a third party cable (either a VESA certified cable 3 meters or lower, like Accel UltraAV or Cable matters. (which is a bit more hit and miss than the Accel).

http://www.amazon.com/Accell-UltraAV-B142C-007B-DisplayPort-Latches/dp/B0098HVZBE/ref=sr_1_1?ie=UTF8&qid=1444370352&sr=8-1&keywords=accel+displayport

I do remember something about the 600 series Geforce cards having some sort of issue with displayport or DVI or 4k...but I don't remember the details.

If you do the clean driver sweep (with DDU) and then use a certified displayport cable (Not the el cheapos that come with monitors) and it still doesn't work, then its 100% the video card/drivers at fault and not your monitor or cable.
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post #7 of 11
Maybe your GTX 670 display port connection is 1.1 or not 1.2a and can't handle 144Hz at 1440p? I also got a XG270HU but it worked perfectly out of the box, surprisingly well calibrated for a TN IMO.

I have a R9 290X and I used the provided cable from the monitor, just making sure here but have you disabled FreeSync from the monitor's OSD settings?
Edited by Dargonplay - 10/20/15 at 6:07pm
post #8 of 11
Can you check the BIT DEPTH selector in the NVidia control panel?
there should be a selection to change from 6 bit to 8 bit color.
This should freely adjustable at 2560x1440@120 hz.

If it is only 6 bit and 8 bit is greyed out, this means you have a displayport 1.1 connector.

Also SOME Monitors have a displayport version selection in their OSD. Please check your XG270HU to see if there is a DP 1.1 or 1.2 selection in the monitor's OSD menu.
Edited by Falkentyne - 10/20/15 at 6:41pm
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post #9 of 11
Quote:
Originally Posted by b0gd4n3l View Post

I have a problem with my graphics card, i cannot get 1440p at 144hz, i cannot create a custom resolution of 1440p 144hz (2560x1440), i can test te resolution using NVIDIA CONTROL PANEL, but it won't save, i cannot use it.

My graphics card is a Gigabyte GTX 670 Windforce OC 2 GB, and my monitor is ACER XG270HU.

I have already tried, installing the acer driver, reinstaling the NVIDIA drivers with safe mode uninstaling, twice, and tried forcing custom resolution with CRU program, and still, nothing seems to work.

I have found your problem.

the Acer XG270HU requires a pixel clock of 586MHz to run at 1440p 144Hz and in the pictures you provided combined with a little research on the GTX 670 specs I can confirm that this card runs at a maximum of 490MHz Pixel Coock speed, just enough for 123Hz at 1440p, from that generation only a 680 would run at the necessary pixel clock speed.

Sorry, I know its a bummer frown.gif
post #10 of 11
Thread Starter 
@Falkentyne

Bit depth is at 8 bit, and i can't choose anything but 8 bit, also i have checked the DP version from the OSD and it's set at 1.2.
What i couldn't find is freesync, on or off, there is no such option, or maybe it has a different name, i don't know.

@Dargonplay

Where did you find that info ? I'm curious, because i heard about pixel clocks, but i didnt think it would have any impact on my setting, can you fetch me the links ?
And you are right, i could only get it to 133HZ from NVIDIA control panel, and i could easily save the settings biggrin.gif
Thank you !!

Thank you all guys biggrin.gif

I guess i need a new GPU.
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