There is a lot of spec weirdness on "usb3" cables. You have to carefully read the description on the cable, and sometimes the reviews. I have seen usb3 charging cables (data is usb2). I have seen usb3 charging (3A or 5A) + 5G, and usb3 charging + 10G. So usb-c to usb-c any length longer than a meter or 2 would need to be an active USB3 cable, and there are different power (3A/5A), and then usb2 speed, 5G or 10G. And they all say usb-c since that connector is on both ends. On Thu, Dec 7, 2023 at 11:57 PM <fedora@xxxxxxxxxxxxxx> wrote: > > A while back I acquired a NVMe caddy but did not get to use it. I now did as I got an NVMe disk. > > The caddy is > https://www.aliexpress.com/item/1005001346524009.html > Color: 10Gbps M2PV C3 > The disk is > 1TB WD Blue SN580 NVMe WDS100T3B0E (PCie v4) > > I expected to see 1GB/s speed. > > Read [X=Y] cable from USB-X to USB-Y. Caddy on left, machine on right. > > 1) Directly connecting the caddy to the machine (caddy-[C=C]-socket) I see 36MB/s. So USB-2? speed. > 2) Using a caddy-[C=USB3M]-socket I get 442 MB/s. So USB-3.0 speed. This is expected. > 3) The kicker: caddy-[C=USB3M] then [FUSB3=C]-socket (two cables) I get the expected 1000MB/s. > > I tried a few C=C , no change. Two different machines. same. > > What I want, of course, is good speed with a straight C=C cable. > > TIA > > -- > Eyal at Home (fedora@xxxxxxxxxxxxxx) > -- > _______________________________________________ > users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx > To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx > Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx > Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue -- _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
