I have Comcast Gigabit Pro, fiber into the house connected to a Juniper ACX2100-AC provided by Comcast. Have 1 SFP + port and 1 ethernet port. Both have static IP's as part of Pro service.Bought my first PEX10000SFP Nov 5, 2015 because it was on the list of acceptable cards to connect to the Juniper. It was set up and working when my service was activated and I have one W10 workstation with this NIC connected to the SFP + adapter in one of the Juniper ports.Worked just OK for two years but during that time every few days all W10 icons on the desktop would flash and I lost internet on the SFP + port. Disable and re-enable the PEX10000SFP adapter fixed the problem. Finally got so fed up I contacted Tehuti.The result was I bought another PEX10000SFP March 29, 2018 and hoped this new card would fix my problem. No go. Would not link to Juniper.Figured card was bad so I got another one March 30, 2018. Same problem no link to Juniper.So I switched to a different NIC, First of all I bought this Network card for our application where we streaming 10 Gb/s UDP packets to server (directly connected), After spending month on this module we where not able to achieve required performance 1-2% packet loss (Core i( CPU, Windows Server 2012 R2), also when you open configuration menu minimum help, description, also some text is bigger then viewable area and you can not resize viewable area. Then we decided to buy Intel X520-DA1 Network card, and whoa-la out of box 10 Gb/s is achieved and I am not talking about documentation in configuration menu that is detailed and well written. And the worst part that this card is twice more expansive than lintel one.Was worried about brand and price but it worked great. Was a great cost effective option for test equipment.DO NOT BUY. This cards does not support linux by default. You have to compile the driver yourself. and IF you running Kernel version 3 or higher. It will crash your system. The company has no plans to update the driver and states that the card is compatible with kernel version 2.6-3.5 but if you install on anything other then 2.6 it will crash your system. IT IS A NO GOStar Tech products always work great. This fiber card does what it is supposed to.Item was not compatible with my OM3 connection. Purchased a different one by intel and it worked with no issues.It was too late for me to return.Purchased 2 of these which both died literally a week apart. Lasted 3 years. These were in a data center with proper cooling and power.Works great as expected. Full 10gb line speeds.great service exactly as describedInstalled the network card in a sinnet tech SE II thunderbolt adapter, downloaded the akitio thunder bolt 10 gbit network drivers installed these on my apple osx 10.10 and presto a 10 gbit network connection for less than 500 pounds!After buying and returning two other adapters, I'm glad to finally have found one that actually works with my Nokia GPON SFP module and Linux.Funciona correctamente con windows 10. Lo mejor es que sólo necesita un puerto pcie x4. Todas las demás opciones necesitan un pcie x8.La tarjeta PCIe x4 10G de StarTech es eficiente y fácil de configurar. Muy importante el cable de fibra óptica 10G.