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x16/x4 Crossfire

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  • 25-10-2009 9:34pm
    #1
    Leman_Russ
    Closed Accounts Posts: 680 ✭✭✭


    So, I am wondering if anyone knows a RECENT review of how much performance is killed using x16/x4 vs x8/x8.

    I have looks extensively, but can only find stuff from early 2008, which we all know is obsolete and useless now :D

    I have heard though it's no more than 20% from x16/x16 to x16/x4...


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    #2
    Effluo
    Registered Users Posts: 1,890 ✭✭✭Effluo


    Leman_Russ wrote: »
    I have looks extensively, but can only find stuff from early 2008, which we all know is obsolete and useless now :D

    ?

    I wouldn't be so dismissive of those results. 20% difference in performance? Very unlikey!

    If you could find that test from 08 plz post it up


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    #3
    Leman_Russ
    Closed Accounts Posts: 680 ✭✭✭Leman_Russ


    http://www.ocforums.com/showthread.php?t=571156

    I only mention it because it is using old Chipsets and old GPUs, while I'll be using 5850s and P55 (which has the onboard PCIe controller) :D


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    #4
    astrofool
    Registered Users Posts: 16,688 ✭✭✭✭astrofool


    Which also means you'll be using PCI-E 2.0 which, so an x4 port will give x8 PCI-E 1.0 performance.

    I thought the P55 boards get configured as x8/x8 in CF or SLI mode?

    The difference would be negligible in either case, I'd reckon, max maybe 5% at high res/high settings.


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    #5
    Leman_Russ
    Closed Accounts Posts: 680 ✭✭✭Leman_Russ


    P55 can indeed do 8x/8x, but it's still limited to the mobo, some can't do two x8 eletrical lanes.


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    #6
    farna_boy
    Registered Users Posts: 1,766 ✭✭✭farna_boy


    Recent review of PCI-E scaling from techpowerup for a 5870. Not sure how this translates to other (older) graphics cards though.

    http://www.techpowerup.com/reviews/AMD/HD_5870_PCI-Express_Scaling/1.html


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    #7
    Leman_Russ
    Closed Accounts Posts: 680 ✭✭✭Leman_Russ


    farna_boy wrote: »
    Recent review of PCI-E scaling from techpowerup for a 5870. Not sure how this translates to other (older) graphics cards though.

    http://www.techpowerup.com/reviews/AMD/HD_5870_PCI-Express_Scaling/1.html

    You sir are Epic Win.

    Have a Cake (it is still a lie though :P)

    I am planning on 5850s, so this is as close as I'll get without actually doing it myself :D

    Wow, holy hells bells. Just read it, the Hit from x4 is nowhere near as bad as I thought. I guess 2x 5850s at 16x/4x crossfire will be fine :D


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