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SLI

Hello,

I am trying to understand SLI. I know it is dual GPU cards. My questions are:

Is this technology only good for 2 or more monitors?

If I can use it only on one Monitor setup, will the graphics power automatically channel to my single monitor connection?

Thanks
12 answers Last reply Best Answer
More about tomshardware
  1. If you are using one monitor the graphics power will be channeled to that monitor. That does not mean that you get double the performance but a substantial increase over a single card up to about 80%.
  2. Thank you, I assume this is automatic provided I have 2 Graphics cards in their individual 2 x PCI-E x16 Slot (CFX x8 or SLI x8) ?
  3. The graphics cards have to be the same (eg. GTX260+GTX260). You cannot SLI two different graphics card (only in certain circumstances). You also need an SLI bridge connecting the two cards together. Many of the older cards do not support SLI. You also need an SLI-compatible motherboard.

    I'm not sure what you're trying to say about "automatic." SLI doesn't work just because you connect two cards into the PCIe slots. You need have an SLI bridge and enable SLI through nVidia's Control Panel.
  4. Thanks again, I think we are almost there.

    Let's say this is my motherboard:

    http://www.biostar.com.tw/app/en/t-series/content.php?S_ID=445

    What I mean by automatic is, do I need to manually connect as you say "bridge" between the cards or is it already setup on this motherboard and I just install the cards.
  5. Best answer
    No, you need an SLI bridge:

    A bridge usually comes with the motherboard, packaged separately inside the box. If a bridge was not included in your motherboard package, you can buy one from various electronics store or on eBay. The bridge is connected to the SLI ports found on the graphics cards making a connection between the two (hence the name "bridge"):


    If you're planning to buy one online, make sure you buy one that is the correct length for your motherboard. If you have some trouble figuring out the length, you can buy a long flexible bridge.

    A few questions. What are your graphics cards? What is your power supply?
  6. Best answer selected by stillupgrading.
  7. The old say, picture is worth a thousand words is true here. That helped alot.

    Also, I am shopping for a gamer computer so I am looking at one that has the motherboard link I provided above. Graphics card is GeForce GTX 250.
  8. If you haven't bought the GTS250 yet and looking for cards that perform about the same, I highly suggest looking at this article first:

    http://www.tomshardware.co.uk/best-graphics-card,review-31829-3.html

    The 5750 is a great choice for a mid-high end card. If you already have a GTS 250, they're still a great choice (perhaps second best in the same price range).
  9. Skolpo,

    The only game I started playing is X-Plane 9.45, and the only thing I could find on this site is for Flight Simulator X from Microsoft. One technician was saying that is mainly uses processing power and Graphic Card is not as priorty as the processor. That is not to say don't get a good Graphics card but that mainly for this type of game it is really about quad processing power. Also, SLI is not a factor either according to this post.

    http://www.tomshardware.com/forum/245454-33-crossfire-faqs

    Thanks on your comments.
  10. No, you need an SLI bridge:
    http://www.hardwarezone.com.au/img/data/articles/2004/1364/digital-link-bridge.jpg
    A bridge usually comes with the motherboard, packaged separately inside the box. If a bridge was not included in your motherboard package, you can buy one from various electronics store or on eBay. The bridge is connected to the SLI ports found on the graphics cards making a connection between the two (hence the name "bridge"):
    http://images.techtree.com/ttimages/story/75003_sli.jpg

    If you're planning to buy one online, make sure you buy one that is the correct length for your motherboard. If you have some trouble figuring out the length, you can buy a long flexible bridge.

    ------------------------------------------------------------------------------------------------

    I am looking at purchasing a computer. I noticed this motherboard supports SLI and crossfire at least according to the information on the site - http://www.biostar.com.tw/app/en/t-series/introduction.php?S_ID=443#

    What I like to know, doesn't it need to PCIE 2.0 slots for video cards? I see one.
  11. No, that board does not support SLI or Crossfire. It only has one PCIe x16 slot.
  12. skolpo said:
    No, that board does not support SLI or Crossfire. It only has one PCIe x16 slot.


    Thanks that is what I thought.
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