Solved

How many pcie expansion slots do i need in a case in order to have 4 way sli/crossfire ?

How many pcie expansion slots do i need in a case in order to have 4 way sli/crossfire ?
15 answers Last reply Best Answer
More about pcie expansion slots case order sli crossfire
  1. 4. May I ask why you plan to do a 4way SLI/Crossfire? What cards are you planning to use?
  2. JobCreator said:
    4. May I ask why you plan to do a 4way SLI/Crossfire? What cards are you planning to use?


    I am just asking a queston.
  3. You will need a motherboard with four PCIE 16X slots that supports four-way SLI/Crossfire.
  4. huilun02 said:
    You will need a motherboard with four PCIE 16X slots that supports four-way SLI/Crossfire.


    I know that but i mean how many pcie slots do i need in a case ?
  5. It depends on the board layout. Some boards have the first slot as PCIE X1 and others PCIE X16.

    Assuming the first slot is a full length X16, to run four two-slot cards would take up eight consecutive case slots.

    If you buy a custom PCB card they usually have a thick cooler that overhangs the third slot, making it practically impossible to install four cards in most cases.
  6. huilun02 said:
    It depends on the board layout. Some boards have the first slot as PCIE X1 and others PCIE X16.

    Assuming the first slot is a full length X16, to run four two-slot cards would take up eight consecutive case slots.

    If you buy a custom PCB card they usually have a thick cooler that overhangs the third slot, making it practically impossible to install four cards in most cases.


    So basically a mid tower case with 8 pcie slots with asus rampage iv extreme can fit 4 gpus but with the risk of bad airflow ?
  7. Yes with that board you will fill the top eight expansion slots of the case. Make sure you are using reference blower cards, or at least ones that won't block two slots below it.
  8. huilun02 said:
    Yes with that board you will fill the top eight expansion slots of the case. Make sure you are using reference blower cards, or at least ones that won't block two slots below it.


    Well two of the cards are watercooled and another 2 of them are refrence models by evga so that would work right?
  9. Should not be a problem then.

    If you don't already know, they all have to be using the same GPU. The cards must support quad SLI. When installed they will require the quad SLI bridge. I assume you have a good enough PSU with enough PCIE connectors.

    And then using an OC software like MSI Afterburner, you will have to sync them to run at the same settings.
  10. huilun02 said:
    Should not be a problem then.

    If you don't already know, they all have to be using the same GPU. The cards must support quad SLI. When installed they will require the quad SLI bridge. I assume you have a good enough PSU with enough PCIE connectors.

    And then using an OC software like MSI Afterburner, you will have to sync them to run at the same settings.


    How do i know that the gpus are running in quad sli ?
  11. If they are running in quad SLI you should be able to see all four cards in your Nvidia software and OC software like MSI Afterburner if you have it installed.
  12. huilun02 said:
    If they are running in quad SLI you should be able to see all four cards in your Nvidia software and OC software like MSI Afterburner if you have it installed.


    This is a little dumb queston but im curius would your pc work if you would have 4 gpus but 2 of the gpus are diffrerend models and the two other cards are differend models so basically the 2 other cards are in 2 way sli and the two other cards are also in 2 way sli would the computer work ?
  13. You can put different cards in SLI as long as they are using the same GPU.

    For example you can have an EVGA GTX 980 pair with a Zotac GTX 980. You can even have all four cards from different brands/models as long as they use the same GPU (but I would not recommend that)

    You will need a quad SLI bridge: http://cdn.slashgear.com/wp-content/uploads/2010/04/4waysligtx480-sg.jpg

    You cannot run two pairs of ordinary SLI.

    What are the cards that you have?
  14. huilun02 said:
    You can put different cards in SLI as long as they are using the same GPU.

    For example you can have an EVGA GTX 980 pair with a Zotac GTX 980. You can even have all four cards from different brands/models as long as they use the same GPU (but I would not recommend that)

    You will need a quad SLI bridge: http://cdn.slashgear.com/wp-content/uploads/2010/04/4waysligtx480-sg.jpg

    You cannot run two pairs of ordinary SLI.

    What are the cards that you have?


    Gtx 780s from evga.
  15. Best answer
    The GTX 780 does not support quad SLI. You can only SLI three cards max.

    http://forums.evga.com/Gtx-780-quad-sli-m1971498.aspx

    But I wouldn't worry if I were you, because you will hardly get any performance out of the fourth card. It will only eat power and generate heat, possibly make more compatibility problems.

    If you didn't already know, running multiple cards does not increase performance by 100% per card. In games that support SLI, a second card will add about 40-60%, and the third card no more than 30%. And there are many games that don't support SLI at all...

    Put the two liquid cooled cards on the top two slots. That way the air cooled one gets all the air it needs.
Ask a new question

Read More

Crossfire SLI PCI Express GPUs Cases Systems