Slow USB Speeds (Limited to USB 2.0) on Thunderbolt Ports – ROG Strix Scar 16 (2025)

[SleepySpider]

Was there a solution to this?
I cannot comment on the previous post where another user had this issue. It was locked.

I can use the USB 3 port to get the appropriate speeds, but not the thunderbolt ports for some reason.

My enclosure is a sabrent enclosure and an M.2 and it can achieve the 3.0 speeds I expected (~1000MB/s) using the USB 3 port and also with other computers.

[Falcon2_ROG]

@SleepySpider 
May I ask for the full model name of the laptop you are using?
[Windows 11/10] How to check the model name and BIOS version 
Please help provide the currently used BIOS version, system version, OS build version. Additionally, please help provide the brand and model of the external device you are using, as well as a photo of it connected to the laptop, to confirm the connection method. We apologize for any inconvenience this may cause.

[SleepySpider]

I will post the information in a few days. I do not have it with me at the moment.

[SleepySpider]

I finally got the information...

Model: ROG Strix SCAR 16 G635LW_G635LW
Operating System: Microsoft Windows 11 Pro 64-bit 10.0.26100
Firmware: Release Date 20250725 | Version G635LW.325

Intel Core Ultra 9 275HX
32 GB Ram
nVidia GeForce RTX 5080 16GB

[SleepySpider]

The enclosure is the Sabrent EC-SNVE.

The M.2 is the Samsung 970 EVO Plus 1 TB

[SleepySpider]

I forgot the photo...

[SleepySpider]

bump

[SleepySpider]

@Falcon2_ROG bump

[Falcon2_ROG]

@SleepySpider 
Could you please provide a screenshot of the USB speed test result showing the slower speed, so I can help you verify the issue? Sorry for any inconvenience it may be caused. 

[SleepySpider · Accepted solution]

@Falcon2_ROG After updating Windows 11 to 24H2 (26100.5074) and possibly updating the Intel dTBT Firmware Update (Driver Date: 8/4/2025, Driver Version: 10.1.2.2, FW Version: 622) through MyAsus, the issue seems to have "magically disappeared" as confirmed using CrystalDiskMark. My speeds are currently in the 1000MB/sec range, which is roughly the max speed of my m.2 drives, so I can't test anything faster than that.

Thank you for your assistance in getting this resolved! I am deeply greatful!!