I'm looking at buy this network card (EXPI9400PTBLK) for use in my server that only has a PCI Express 2.0 8X slot available. Will this card work in this slot? I've tried another, much cheaper desktop card without success. According to what I can find reading various articles on PCI specs, PCI devices/slots are supposed to be forward and backward compatible.
Neither the EXPI9404PT or the EXPI9404PTBLK will work in the PCIe 2.0 slot unless you have a BIOS that allows you to set the PCIe version to emulate the older 1.0a version.
However, EXPI9404PTLBLK and EXPI9404PTL, http://www.intel.com/products/server/adapters/pro1000pt-quadport-low-profile/pro1000pt-quadport-low-... Intel® PRO/1000 PT Quad Port Low Profile, which are PCIe version 1.0a, had a hardware change that made them forward compatible.
You might want to consider http://www.intel.com/Products/Server/Adapters/Gb-EF-Dual-Port/Gb-EF-Dual-Port-overview.htm Intel® Gigabit ET2 Quad Port or http://www.intel.com/Products/Server/Adapters/esa-i340/esa-i340-overview.htm Intel® Ethernet Server Adapter I340, which are PCIe version 2 adapters.
You can see a comparison of the current adapters at http://download.intel.com/network/connectivity/products/prodbrf/252454.pdf http://download.intel.com/network/connectivity/products/prodbrf/252454.pdf.
@mashime - Thank you for your post. I realize that I was not speaking about the right adapter when I answered. Everything I posted was about the quad port adapters.
@ithank - I am sorry that I did not address your question properly. The single port http://www.intel.com/products/server/adapters/pro1000pt/pro1000pt-overview.htm Intel® PRO/1000 PT Server Adapter, EXPI9400PT and EXPI9400PTBLK, are forward compatible with PCIe 2. However, that compatibility also depends on the motherboard. I can think of a couple of things that might help you get the adapter to work.
Thanks for both of your answers. I ended up ordering the card before your first reply based on both Intel tech support chat and server mfr stating it was compatible. I have a flexible riser card coming that will allow me to install it in a PCIe 1.0 slot if nessary.