Is it possible to achieve a refresh rate of 240Hz on an external monitor connected to a laptop?
Is it possible to achieve a refresh rate of 240Hz on an external monitor connected to a laptop?
I just acquired a gaming notebook and a 240HZ external display. However, the laptop lacks a DP port, while the monitor does. I’m investigating what cable or adapter I require to operate my external screen at 240Hz, as HDMI 2.0 doesn't appear capable of achieving this refresh rate.
Items Purchased:
https://www.amazon.com/gp/product/B07SN3..._qh_dp_hza
https://www.amazon.com/gp/product/B06WRP...UTF8&psc=1
You won’t discover this information directly, as they typically only state the maximum supported resolution and the corresponding refresh rate it allows. Therefore, you must perform calculations yourself.
Bandwidth calculation:
1080p @ 240Hz 8-bit:
channel bandwidth – 5.94 Gbps
total signal bandwidth – 17.82 Gbps
1080p @ 240Hz 10-bit:
channel bandwidth – 7.13 Gbps
total signal bandwidth – 21.38 Gbps
1080p @ 240Hz 12-bit:
channel bandwidth – 8.32 Gbps
total signal bandwidth – 24.95 Gbps
DisplayPort 1.4:
maximum channel bandwidth – 8.1 Gbps
maximum total signal bandwidth – 32.4 Gbps
As you can see, this configuration operates without requiring DSC compression. If you select a different cable (such as USB-C to DisplayPort) ensure it supports DisplayPort 1.3 or 1.4; otherwise, a DP 1.2 cable will only handle 8-bit 1080p @ 240Hz (with a maximum bandwidth of 21.6 Gbps).
You’ll require a USB-C to DisplayPort adapter: https://www.amazon.com/Cable-Matters-Dis...B01K51GM46
Is it possible to achieve a 240Hz refresh rate on the monitor despite the cable stating “supporting 60Hz”?
The cable supports 8K resolution at a refresh rate of 60Hz. DisplayPort 1.4 is capable of handling 1080p displays with a 240Hz refresh rate.
I apologize, but I don’t observe any mention of 240Hz within this link?
You won’t discover this information directly; they typically only state the maximum supported resolution and the corresponding refresh rate it allows. Therefore, you must perform calculations yourself.
Bandwidth calculation:
1080p at 240Hz 8-bit:
channel bandwidth – 5.94 Gbps
total signal bandwidth – 17.82 Gbps
1080p at 240Hz 10-bit:
channel bandwidth – 7.13 Gbps
total signal bandwidth – 21.38 Gbps
1080p at 240Hz 12-bit:
channel bandwidth – 8.32 Gbps
total signal bandwidth – 24.95 Gbps
DisplayPort 1.4:
maximum channel bandwidth – 8.1 Gbps
maximum total signal bandwidth – 32.4 Gbps
As you can see, this is sufficient without requiring DSC compression. If you select a different cable (such as USB-C to DisplayPort), ensure it supports DisplayPort 1.3 or 1.4. A DP 1.2 cable can only handle 8-bit 1080p at 240Hz (with a maximum bandwidth of 21.6 Gbps).
A Thunderbolt 3 connection offers speeds of 40Gbps, making it unnecessary for most users.
You mentioned compatibility with both USB-C to DP or Thunderbolt 3 connections.
ASUS laptops are renowned as the premier portable computers, known for their portability, durability, and ample performance for demanding tasks and media enjoyment.
Explore information about DisplayPort Alternate Mode on startech.com’s blog: “Tech Talk: Using USB-C and DisplayPort over Alt Mode.”