Gaming Discussions

[NongZhang]

Last week，i bought a 2k 165Hz monitor Lenovo Y27Q-30,when linked to my old PC which has been used for almost five years,there is white line flicking in screen.GPU is RX480 and has been updated graphic driver to   latest. 

https://www.amd.com/zh-hans/support/graphics/radeon-400-series/radeon-rx-400-series/radeon-rx-480

[elstaci]

How is your Monitor connected? DP or HDMI?

From https://www.displayninja.com/which-cable-do-i-need-for-144hz/

HMDI 2.0b:

HDMI 2.0 is also fairly standard and can be used for 240Hz at 1080p, 144Hz at 1440p and 60Hz at 4K.

For HDMI 2.0, you’ll need a cable rated for at least 18 Gb/s and labeled as ‘Premium Certified Cable‘ or ‘Premium High Speed.’

DP 1.4a:

DisplayPort 1.3 and DisplayPort 1.4 provide the extra bandwidth required for 240Hz at 1440p, 120Hz at 4K, 60Hz at 5K and 30Hz at 8K.

The main difference between DP 1.3 and DP 1.4 is that the latter supports DSC (Display Stream Compression), which allows it to deliver 144Hz at 4K, 120Hz at 5K and 60Hz at 8K — but with compression

For DisplayPort 1.4, look for a cable rated for 32.4 Gbps and HBR3 bit rate class. DisplayPort cables are backward-compatible as well. If you need a cable longer than 33ft (15 meters), you’ll need to look for an active cable.

According to TechPowerUp specs on the RX480 it uses HDMI 2.0b ports and DP 1.4a ports

[NongZhang]

thank,DP port is used.When i set 144Hz, 120Hz,60Hz, all is ok. It seems that RX480 cant support 165Hz, 2K.

[caerbannog]

To reiterate what @elstaci posted above:

There is a non-zero chance you are using a DP 1.2 cable when connecting your 2K 165Hz monitor to your RX 480 GPU.

https://www.cablematters.com/Blog/DisplayPort/does-displayport-support-144hz 

Quote from the article: "DisplayPort 1.2 can output 1080p and 1440p resolutions at 144Hz, while DisplayPort 1.3 and 1.4 increased bandwidth to manage up to 240Hz at those same resolutions and up to 120Hz at 4K."

Spoiler

Put this here just in case. 2K resolution is marketing speak for 1440p

 EDIT: On paper the RX 480 has uses DisplayPort 1.4a. I welcome to be proven wrong if you were to obtain a known working DP 1.4a cable and the RX 480 still gets capped at 144hz.

Post pics of your results so that your efforts can help out future people that maybe in the same situation as you are, please.

[lajmonline]

Too professional, I don't understand