SLI and CrossFire — NVIDIA and AMD’s respective multi-GPU technologies letting two or more graphics cards work together — were genuinely prominent enthusiast features for over a decade before both largely, quietly faded away entirely.
What SLI and CrossFire Actually Did
Multiple identical GPUs, connected via a genuine dedicated physical bridge connector (or later, purely over the PCIe bus itself), split rendering work between them - either alternating complete frames between cards, or splitting each individual frame into sections for each card to render its own assigned portion
Why It Was Genuinely Popular for a Time
For a meaningful period, adding a genuinely identical second GPU offered real, substantial performance gains, particularly appealing to enthusiasts wanting genuinely maximum performance without waiting for the actual next full generational GPU release to become available.
Why It Genuinely Faded Away
- Inconsistent, unreliable scaling — real performance gains varied enormously by specific game, and many titles genuinely saw little to no meaningful benefit at all, or occasionally even worse performance than a single card alone
- Micro-stuttering — a genuine, real, and widely documented complaint where alternating-frame rendering produced meaningfully uneven actual frame delivery timing, feeling noticeably less smooth than the raw average frame rate number alone would suggest
- Driver support genuinely, gradually declined — as adoption meaningfully dropped, developers increasingly deprioritized multi-GPU optimization, creating a real, self-reinforcing negative cycle
- Single-GPU performance improved dramatically — genuinely reducing the real practical need for the added complexity multi-GPU setups introduced in the first place
Where Multi-GPU Genuinely Lives On Today
Multi-GPU setups remain genuinely relevant today specifically for professional compute workloads (AI training, rendering farms) where work can be cleanly, independently divided across cards without SLI/CrossFire’s specific real-time frame-synchronization challenges — the gaming-specific use case is what genuinely, largely disappeared, not the underlying multi-GPU hardware concept itself.