A silly question on PCI Express

By sc055
May 10, 2009
  1. If I add a Pci Xprss 2.0 x16 graphics card into Pci Xprss 1.0 x16 slot..what is gonna happen....does da card gonna work or not??

    I know this is a silly qstn..but jst want to know wat's gonna happen...plz reply..

    Tx :)
  2. red1776

    red1776 Omnipotent Ruler of the Universe Posts: 5,219   +157

    Hi sc,
    not a silly question at all, pcie gen 2 cards are backwards compatible with pcie 1.0, so it will work just fine. if this is a newer motherboard, you may be able to activate your pcie slots to gen 2. as sometimes they come defaulted to pcie 1.0, just something to check.
  3. Matthew

    Matthew TechSpot Staff Posts: 5,261   +92

    Not to mention the fact that whatever PCI-E 2.0 card you'll be using in a 1.0 slot won't saturate the bandwidth anyway. It is indeed backward compatible as noted by red1776 - and there's plenty of headroom in 1.0, so go for it.
  4. sc055

    sc055 TS Rookie Topic Starter

    Tx for da reply......

    My motherboard is Foxconn MCP61SM2MA..its kinda old has x16 do I know i can upgrade its slot to x16 Bios upgrade?

    Another question... If i install how can figure out which Graphics card needs how much power there any software or something like this out there...?
  5. Matthew

    Matthew TechSpot Staff Posts: 5,261   +92

    Whether or not "upgrading" to 2.0 is a feature of your motherboard is irrelevant - like I said, even if you install a 2.0 card it won't saturate a 1.0 slot's bandwidth. Either way... take a look in your motherboard manual (which can be found on the manufacturer's website, if you don't have a physical copy).

    To figure out the power requirements of a video card, check out its manufacturer's website, or run a Google search (e.g. GeForce 8800GT power requirements). I'm sure you'll get more than enough information - otherwise, feel free to post the card here.
  6. red1776

    red1776 Omnipotent Ruler of the Universe Posts: 5,219   +157

    put it this way, pcie 1.0 is 250 gb/s pcie 2.0 is 500 gb/s and i believe that the biggest of cards (the gtx 295) is pushing 222 gb/s a sec, so just something to keep in mind for if you get a monster card next year when the new ones come out pushing 250gb/s + or get a newer board. yours is only capable of pcie 1.0 though
  7. klepto12

    klepto12 TechSpot Paladin Posts: 1,115   +9

    you cant update and get 2.0 it is hardware based not software but any card you get now will be fine on 1.0 spec.
  8. Matthew

    Matthew TechSpot Staff Posts: 5,261   +92

    I don't think anyone is arguing that. Red1776 suggested that the original poster's motherboard might feature an option to enable and disable the PCI-E 2.0 (Gen 2) speeds. This is indeed an present among some boards.

    If it was aimed at me for saying, "Whether or not "upgrading" to 2.0 is a feature of your motherboard is irrelevant" - please note the quotes around "upgrading" and how the post prior to mine referred to the possible enabling/disabling of PCI-E 2.0 as an "upgrade".

    Thanks for the rere..reconfirmation that PCI-E 2.0 is backward compatible with 1.0.
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