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PCI-SIG Finalizes PCI-Express 3.0 Specifications

Discussion in 'News' started by btarunr, Nov 18, 2010.

  1. btarunr

    btarunr Editor & Senior Moderator Staff Member

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    The PCI-SIG finalized the specifications of PCI-Express 3.0 bus, the latest version of PCI. Like PCI-Express 1.x and PCI-Express 2.x, PCI-E 3.0 is designed to be backwards-compatible with devices that use older versions of the bus. Keeping up with the major version trend, PCI-E 3.0 doubles the theoretical bandwidth. PCI-Express 3.0 can push 1 GB/s per lane, per direction, double that of PCI-E 2.0. A PCI-Express 3.0 x16 slot would hence have its cumulative bandwidth at 32 GB/s.

    Apart from pure bandwidth increases, PCI-Express also uses the new 128b/130b data encoding scheme, which reduces protocol overhead significantly, allowing near-100% utilization of available bandwidth. To put this into perspective, PCI-Express 2.0 had a data-rate of 5 GT/s, but with its overhead, could only effectively transfer 4 GT/s. The new scheme allows utilization of all 8 GT/s of the bandwidth PCI-Express 3.0 has, resulting in a data-rate of 1 GB/s per lane, per direction. The PCI-E specification document is available to PCI-SIG members. It is expected that the first PCI-Express 3.0 compliant devices will come to be in 2011.
     
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  2. dir_d

    dir_d

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    Did they increase the power of the PCI-E slot? I also wonder if that 300 watt rule will go away once 3.0 comes to motherboards. It would be time to get rid of the retro limitations.
     
  3. WhiteLotus

    WhiteLotus

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    Be pretty sweet if we could do some real benches with this. Same card at same clocks, just all at different bandwidths.
     
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  4. W1zzard

    W1zzard Administrator Staff Member

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    whatever that means
     
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  5. dlpatague

    dlpatague

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    I don't think this will do anything for video cards in terms of greater performance in the immediate future. Video cards don't saturate the x16 PCI-E 2.x slots right now. Right now you can get the same performance out of an x8 PCI-E 2.x slot as you can from the x16 slot. I think the PCI-E 3.0 spec will more benefit PCI-E SSDs, SATA addin cards like RAID cards, or USB 3.0 addin cards, for now. It will be a while before a video card will be able to take advantage of the PCI-E 3.0 spec because they just don't move enough data yet. Of course this is all just my opinion and I may be wrong. Non the less it is always good to see technology advance and performance improved.
     
  6. Batou1986

    Batou1986

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    Looks to me like they are saying it will follow the previous standards without any new improvements :ohwell:
     
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  7. Bo$$

    Bo$$ Lab Extraordinaire

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    300W from a PCI-e slot?? it is 75W max now....
     
  8. inferKNOX

    inferKNOX

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    FINALLY.
    I look forward to buying an AM3+ mobo with PCI3.0, then Bulldozer and top it with a HD7000 cherry... *sigh*
     
  9. EarthDog

    EarthDog

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    The current bandwidth isnt even choking out dual GPU cards, so this isnt going to help a bit.

    Exactly. I had some trouble figuring out the power at the slot. MANY websites reported 150W but that appears to be wrong? Im still not sure. :slap: :D

    1-2% according to this sites review on a 5870. ;)

    It would be nice to see that same article but with a 5970, or a 580 to see if performance drops more.
     
  10. Mussels

    Mussels Moderprator Staff Member

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    the PCI-E specs include the power connectors, of course.

    300W would be from slot and two 8 pin connectors.
     
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  11. bear jesus

    bear jesus New Member

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    I have to agree on the graphics card part, but i would love to see what kind of insane speed would be possible with a pci-e 3 x16 ssd card.
     
  12. TAViX Guest

    Yep, PCI-EX 3.0 would be ideal for SSDs drives. 32GB/s ? I wish they could make optical network adapters that fast ;)
     
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  13. Drone

    Drone

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    2011 seems to be a good year. now I only wait for ddr4
     
  14. mlee49

    mlee49

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    Yeah! I'm stoked about this! Glad to see it being finalized and improved.
     

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