Forum Discussion
windows 11 thunderbolt 4 bug
Projectik I have opened a case with MS for a very similar issue with the Intel 12 gen Windows 11 USB4 issue. I have a Dell Vostro 7620. I purchased a Sandisk extreme pro external SSD. The external SSD device has advertised transfer speed support up to 2000 mbs, However, when connected by the USB 4 (thunderbolt 4) it only transfers at a capped 1096 mbs on crystalmark speed tests, and around 600 mbs ish realtime. When I looked in devices it appears to be recongnised as a USB3.0 device (not USB 3.2 2x2). The same issue happens on a windows 10 windows to go install with it speeds capped at 1096 mbs. But, this is the thing - The Windows 10 Thunderbolt driver runs 10 - 20% quicker 700+ mbs. This means the USB4 implementation on Windows 11 is A: not as quick as using the thunderbolt driver on Windows 10 and B: windows OS 10 & 11 doesn't run the SSD with the supported USB 3.2 2X2 functionality. I know this is not strictly a Thunderbolt issue. but the fact the thunderbolt drivers on Windows 10 run more efficently than the Win 11 USB 4 implementation is worth noting.
Kowleone Lenovo finally got around to telling me that I needed to upgrade firmware. I did that and it solved the problem. I still think that it's a pretty sorry state of affairs when MS breaks hardware simply by updating their OS, and doesn't bother to say anything about it. 😞
JTF
johnt69 I Totaly agree ! It appears that MS roll out changes on there OS without any decent change control or quality assurance testing nowadays. If they use TB drivers on Windows 10 and the TB drivers works more efiifenty than the new MS USB4 implementation then there is something wrong with there planning and implementation process. I'm glad you managed to sort your issue out in the end though.
- the external SSD support USB3.2 gen2x2 (20gbps), but I'm pretty sure that your thunderbolt port only support thunderbolt device or USB 3.2 gen2 (10gps). There is no LAPTOP support USB3.2 gen2x2 (20gbps) in the current market
Hi Mason, On the official Dell specs PDF for the Dell Vosto 7620 it states that the Thunderbolt 4 port supports up to 40 GB transfter speed and is backwards compatible with USB 3.2, 2.0 and Thunderbolt 3:
4. Thunderbolt 4.0 port with Power Delivery and DisplayPort
Supports USB4, DisplayPort 1.4, Thunderbolt 4 and also enables you to connect to an external display using a display adapter.
Provides data transfer rates of up to 40 Gbps for USB4 and Thunderbolt 4.
If the above is true from Dell official specifications I would expect the the external SSD to run in USB 3.2 2x2 on the USB4 implentation on Windows 11. However, Dell won't support 3rd party products. MS will blame Dell, and Sandisk will blame Microsoft. I'll see what they say on the case I have opened. Hopefully it's just an OS bug that will be resolved in the future.
Also if you are correct, which you probably are (and I appreciate your input and the reply), If the thunderbolt 4 conncector I have only supports 3.2 gen 2, then SSD only runs at about 2000 mbs max which is less than a quater of the (10 gbps) supported by 3.2 gen 2.Thunderbolt 4/ Thunderbolt 3 not compatible with USB3.2 gen 2x2(20gbps). You can use thunderbolt SSD enclosure though. Attached is my SSD enclosure speed test
