Mini DisplayPort to DisplayPort not outputting more than 85hz on a 165 hz monitor.

[abdulazizalkuwari]

I connected my Asus Laptop (https://www.cnet.com/products/asus-rog-g701vi-xs78k-17-3-core-i7-7820hk-64-gb-ram-512-gb-ssd-2x/specs/)

To this monitor (https://www.amazon.com/PG278QR-2560x1440-G-SYNC-Gaming-Monitor/dp/B01N4ENDXR/ref=sr_1_1?ie=UTF8&qid=1526336556&sr=8-1&keywords=165+hz+monitor)

Using a mini displayport to displayport cable similar to this (https://www.amazon.com/DisplayPort-Moread-Gold-Plated-Thunderbolt-Resolution/dp/B01N5RY8D7/ref=sr_1_1_sspa?s=electronics&ie=UTF8&qid=1526336648&sr=1-1-spons&keywords=mini+displayport+to+displayport+cable&psc=1) but by a different company called "Hay Cable" and it is made in China.

The screen turns black intermittently sometimes and it fails to display more than 85 hz, showing me "DisplayPort No Signal". I was wondering how can I fix this? I'm hoping to be able to use this cable to hook up my laptop to a 240hz monitor, would that work?

 

[jacobweaver800]

I connected my Asus Laptop (https://www.cnet.com/products/asus-rog-g701vi-xs78k-17-3-core-i7-7820hk-64-gb-ram-512-gb-ssd-2x/specs/)

To this monitor (https://www.amazon.com/PG278QR-2560x1440-G-SYNC-Gaming-Monitor/dp/B01N4ENDXR/ref=sr_1_1?ie=UTF8&qid=1526336556&sr=8-1&keywords=165+hz+monitor)

Using a mini displayport to displayport cable similar to this (https://www.amazon.com/DisplayPort-Moread-Gold-Plated-Thunderbolt-Resolution/dp/B01N5RY8D7/ref=sr_1_1_sspa?s=electronics&ie=UTF8&qid=1526336648&sr=1-1-spons&keywords=mini+displayport+to+displayport+cable&psc=1) but by a different company called "Hay Cable" and it is made in China.

The screen turns black intermittently sometimes and it fails to display more than 85 hz, showing me "DisplayPort No Signal". I was wondering how can I fix this? I'm hoping to be able to use this cable to hook up my laptop to a 240hz monitor, would that work?

I just did a bit of research and it looks as if it is a mini displayport limitation, there is no proof but it looks as if Mini DP just can't push that res and refresh rate. The only time I have seen Mini DP in use is on 60hz displays so I think we are looking at a limitation if Mini DP even though it's uped to DP I don't think the port is capable of pushing that amount of data.

 

[boju]

Mini Dp is just a different form factor, the cable itself isn't limiting, the DP version is however. There are an abundance of cheap improper made cables out there not made to spec. Need to know the exact cable you bought because a cable that looks similar will be different inside and how many of the copper wires are connected to the ends to support higher bandwidths.

Accell is a Vesa certified brand.

https://www.amazon.com/Accell-DisplayPort-Cable-Locking-Latch/dp/B00A7R9I22

DP version 1.2/1.2a can support 1440p @ 165Hz or 1080p 240Hz RGB uncompressed video. Your laptop's GPU has DP 1.4 so it has the bandwidth to run a 1440p @ 240Hz monitor. These monitor's dont exist yet but are coming.

1080p 240hz monitors out now are DP 1.2a, DP 1.4 will be used in 1440p 240Hz and 4K 120Hz displays in near future but expect them to be expensive.

 

[jacobweaver800]

Mini Dp is just a different form factor, the cable itself isn't limiting, the DP version is however. There are an abundance of cheap improper made cables out there not made to spec. Need to know the exact cable you bought because a cable that looks similar will be different inside and how many of the copper wires are connected to the ends to support higher bandwidths.

Accell is a Vesa certified brand.

https://www.amazon.com/Accell-DisplayPort-Cable-Locking-Latch/dp/B00A7R9I22

DP version 1.2/1.2a can support 1440p @ 165Hz or 1080p 240Hz RGB uncompressed video. Your laptop's GPU has DP 1.4 so it has the bandwidth to run a 1440p @ 240Hz monitor. These monitor's dont exist yet but are coming.

1080p 240hz monitors out now are DP 1.2a, DP 1.4 will be used in 1440p 240Hz and 4K 120Hz displays in near future but expect them to be expensive.

Interesting, I have looked around quite a bit and couldn't find any of that information, but good to know. At this point it is most likely the cable, like stated above.

 

[boju]

Here's some info https://www.displayport.org/cables/how-to-choose-a-displayport-cable-and-not-get-a-bad-one/

 

[boju]

Also see

https://en.m.wikipedia.org/wiki/DisplayPort

Good read and more specifically see section, Connectors and pin configuration.