Will 295x2 works on a PCI 2.0 x16 slot?

Discussion in 'Videocards - AMD Radeon' started by Alpin_fresh, May 21, 2014.

  1. Alpin_fresh

    Alpin_fresh Active Member

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    Hello,

    question is in the tittle, thanks.

    Regards,

    Alpin
     
  2. Agent-A01

    Agent-A01 Ancient Guru

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  3. Alpin_fresh

    Alpin_fresh Active Member

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    No performance lost?

    Thanks Agent-A01

    I am getting quite lost on new tech since 2012.
     
  4. Rich_Guy

    Rich_Guy Ancient Guru

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    There is, but its that slight, you won't notice any difference :)
     

  5. Cyberdyne

    Cyberdyne Ancient Guru

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    I'm assuming that it's not going in your sig rig, your mobo has 3.0 slots. The real issue you should worry about is since it's obviously a dated setup, CPUs that come to mind with a PCI-E 2.0 motherboard would most likely heavily bottleneck that GPU. I know you were not asking that, but a dated CPU will hold back a GPU much more then the slot speed will.
     
  6. ---TK---

    ---TK--- Ancient Guru

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    It will bottleneck slightly but I wouldn't worry about it. I have 780ti sli with a 2600k at 4.7 and get great performance. Going to do a full cpu mb upgrade anyway.
    You need an ib cpu you get 3.0 on that mb.
     
  7. Cyberdyne

    Cyberdyne Ancient Guru

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    If he is using a 2600k for that GPU I would have not bothered to say anything. He would also have PCI E 3.0, since his motherboard has it. As in (like I pointed out) it's doubtful that we are talking about his sig rig. And nvm, if you need ivy bridge then for 3.0 to work then obviously we are talking about his own rig. Yeah it'll be fine, sorry for the confusion, just wasn't very clear.
     
    Last edited: May 22, 2014
  8. Fox2232

    Fox2232 Ancient Guru

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    As Agent-A01 and Rich_Guy wrote. You will be just fine with your mobo/CPU.

    While PCIe2.0 will take based on game 1-6% of performance with r9-295x2.
    You will not need to change your CPU for long time.
    Clock to clock 4770k comes between 0-10% better than 2600k based on workload type. That alone says that 2600k@4.9GHz does perform same as 4770k@4.5GHz in some workloads and in others 2600k is simply faster.

    Games are not one of those workloads where you necessarily need even 2600k over 4.0GHz and your bottleneck right now is HD7970. And once you buy r9-295x2, you will still be bottlenecked by GPU.

    Especially if you play at 60Hz, CPU exchange makes no sense. If you demand 120/144Hz then 4GHz 2600k is still enough for most of games.
    http://www.ocaholic.ch/modules/smartsection/item.php?itemid=1164&page=11
    This is worst case scenario from games which matter. Heavy on GPU and on CPU too. With that card in your mind you can do around 100fps maxed details.
    But even if you set low graphics details your 4.9GHz will not get you further than 145-150fps as well as 4770k @4.5GHz.

    What does this mean? It means that if you have 60Hz screen, you do not need to care about lowering graphics details for long time.
    If you have 120Hz you may time to time sacrifice something to get there but CPU will not be limiting factor in 98-99% of cases and if it was then 4770k would not solve it for you anyway.
    At 144Hz you may found few CPU over-extensive games which were designed with only 60Hz in mind and therefore not possible to reach 144fps no matter what CPU you get.

    But to sum it up, buying new GPU for 1500$ = average gaming performance upgrade +120%.
    Buying 3770k which works with your mobo and kind of benefits only from PCIe 3.0 and not by much better IPC for 300$ = average gaming performance upgrade 2% (if you get it to same clocks ~=4.9GHz).

    And as that being said I do not believe you want to have 3770k @4.9GHz.
     
    Last edited: May 22, 2014
  9. Alpin_fresh

    Alpin_fresh Active Member

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    I am talking about my sig rig.

    I tought it was pci 2 only as i have cf on pcie 2 x 8.0

    I am playing on 3 *1920*1080 @120Hz (5760.1080)

    Thanks for your comments.
     
    Last edited: May 22, 2014
  10. Fox2232

    Fox2232 Ancient Guru

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    Nice setup. At that resolution you would need 4GPUs to see at least some CPU bottleneck and even there I am not quite sure as 4GPU scale up around 2.8x ~ 3.2x only.

    As a test of bottleneck on that screen setup you can easily do some gaming bench:
    Test your current setup at your 4.9GHz. Retest @4.0GHz, @3.5GHz, @3.0GHz, @2.5GHz.
    Then you will get simple graph where at some point fps will go down fast at very noticeable point and that is frequency where CPU bottleneck starts/ends for given game.
     

  11. ---TK---

    ---TK--- Ancient Guru

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    Excellent link there comparing those cpu`s. My 3 year old 2600k at 4.7 still gives great performance and is able to feed 2 780ti just fine. OP 2600k at 4.9ghz is very good for that dual gpu amd 295 x2
     
  12. sykozis

    sykozis Ancient Guru

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    Intel put the PCIe controller on the CPU. The 2600K only has a PCIe 2.0 controller onboard so it doesn't matter that his motherboard supports PCIe 3.0. Unless the motherboard is using a PLX chip for all it's slots, he's still stuck with PCIe 2.0 just like I am....
     
  13. Valken

    Valken Ancient Guru

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    Curiously related but would I see 90%+ benefit going from my sig rig to a 295x2 or 2x 290/290x from my current setup? I've been looking at 4k monitors for desktop work but would like to play games on it too yet know my current gpu setup will be hard to get 60 FPS on it, even with no AA.

    I'm waiting for Haswell-E to come out before the next cpu/mb/ram upgrade but figure I could jump on the 4K / gpu upgrade if its down in price enough.
     
  14. Fox2232

    Fox2232 Ancient Guru

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    To be honest, I do not believe you should go with AMD GPU atm. if you want 4k Screen.
    As 4k are limited to 60Hz and if that particular screen does not support Free/GSync you would still get better gaming experience from 120/144Hz screen.

    And why not AMD for 4k? Because while I believe someone will make 4k Freesync screen, we already have confirmed 4k-GSync screen in production and in sales soon.
    (and that Freesync may come even next year)

    Therefore with GSync screen you will have better experience with nV GPU around 45-50fps than with AMD GPU 55-60fps.

    If I was into 4k for gaming purpose I would:
    - Wait for time when GSync 4k is available, if at least 4k Freesync gets announced I would wait for that and go with AMD
    - but if there are no Freescreen announced at time GSync 4k is available for purchase, I would just switch to nVidia
     

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