They have to be the same GPU, and they have to have the same amount of video RAM.įor example, if you had a GTX 1070 TI 8GB made by Asus, and another of the exact same specs, but made by MSI, it would still work. The first thing you need to know is what graphics cards will pair together not just any two cards will work. But then again, it never is… Two (or more) of a Kind Compatibility and IssuesĪlright, so all you need to do is buy two graphics cards? Do I just slap any two Nvidia cards into my motherboard and call it a day? Unfortunately, it’s not that simple. Anti-aliasing helps fix this by sampling pixels around the problem area and then filling in the best approximate guess. Keyword: Anti-aliasing – Computer pixels are made of squares, which can result in round images looking jagged around their edges. Using this mode can unlock higher anti-aliasing modes within games (such as SLI 8x, 16x, and even 32x on quad-SLI systems). It works to split the anti-aliasing workload between the cards, increasing the overall quality of your image.
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This mode allows for better image quality, as opposed to pushing higher frame rates. If the cards are not synced up properly, or they don’t have enough information to guess the next frame that needs to be rendered, then you will see a delay. Keyword: Micro Stuttering – This it when you see visual stutters on your screen caused by a discrepancy in frame rendering times between cards. This is often considered more effective than SFR for achieving higher frame rates, but it can also cause issues such as micro stuttering. So, if you are running 2 cards, then one would be responsible for even-numbered frames while the other would be responsible for odd-numbered frames. In this mode, the frames are queued up and each card renders a full-frame. (Note: these percentages are just vague examples, not concrete numbers.) Alternate Frame Rendering (AFR) So, the card responsible for the upper portion of the screen may receive about 60% of the screen real estate while the card responsible for the bottom will only have to process the bottom 40%. It can split the frame how it sees fit based on what’s in the frame.įor example, if the frame contains a mostly empty, static sky in the top half of the frame (less resource intensive), but moving characters in the bottom half (more intensive), then it will determine that one card would be doing more work if it is merely split 50/50. This method takes the frame that needs to be rendered, analyzes it, and then splits up the frame horizontally into as many pieces as there are cards, and sends the workload between them. You can select and change these modes in the Nvidia Control Panel, which should have been installed onto your computer when you installed your video card drivers.
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Nvidia graphics cards will work together in SLI in three main modes: SLI anti-aliasing, SFR, and AFR.
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It achieves this by using a parallel processing algorithm, which takes the information, breaks it down into smaller pieces, and allows for multiple pieces to be worked on at once by multiple cards.
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In 2004, Nvidia re-released SLI with updates to allow it to work with the then-current technology of PCIe buses.Īlthough there are compatibility concerns (discussed below), associated with running multiple GPU setups, SLI will allow the use of two to four cards at once. This technology was first used by the company 3dfx on their Voodoo2 graphics card line in 1998, but later the company was bought by Nvidia and the technology was shelved for a while. So what is SLI? And what does SLI do, or more specifically: how does it help me run multiple graphics cards to improve my gaming? Scalable Link Interface (SLI) is a little gem given to use by the masterminds over at Nvidia in 1998.