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Does Iracing Support Sli

Does iRacing support SLI? Clear answer and quick steps for iRacing drivers to fix performance or stutter issues fast. Use one GPU, disable SLI, update drivers.

If your question is “does iracing support sli”, short answer: no — iRacing does not officially support NVIDIA SLI. You’re in the right place to fix any related stutter, poor frame pacing, or crashes. Below is a direct explanation and simple steps to resolve it fast.

Quick Answer: does iracing support sli

No. iRacing does not have official, reliable support for NVIDIA SLI (multi-GPU linked mode). The sim is designed to run on a single, strong GPU. Trying to force SLI usually causes microstutter, poor scaling, or instability.

What’s really going on

SLI (Scalable Link Interface) splits work across two or more NVIDIA GPUs. Many modern games and sims no longer support it because developers and GPU vendors moved away from multi-GPU profiles. iRacing’s renderer and current drivers expect one GPU to handle the workload. If SLI is enabled, the driver may try alternate-frame rendering or a fallback that produces uneven frames, visual glitches, or little to no performance gain.

If you see odd frame timing, stuttering, or lower-than-expected GPU utilization, SLI is a likely culprit. Laptops with integrated and discrete GPUs can show similar problems if the wrong GPU is used.

Step-by-step fix

  1. Open NVIDIA Control Panel and disable SLI (set “Maximize 3D performance” off). Restart Windows if prompted.
  2. In Windows Settings → System → Display → Graphics settings, set iRacing.exe to “High performance” so the dedicated GPU is used (important for laptops).
  3. Update NVIDIA drivers to the latest Game Ready or Studio drivers, then reboot. Old drivers can mis-handle multi-GPU configurations.
  4. In iRacing, use a single display adapter and test at your normal settings. Lower render quality or resolution if you’re CPU-limited.
  5. Monitor with MSI Afterburner or GPU-Z during a session: check GPU utilization and frame times. If one GPU is doing all the work and frames are smooth, you’re fixed.
  6. If problems persist, turn off any driver-level SLI/affinity settings and remove any third-party multi-GPU tools. Contact iRacing support only if you have a professional multi-GPU workstation — consumer SLI is unsupported.

Extra tips / checklist

  • Use one powerful GPU rather than two weaker ones for smoother frame pacing.
  • For VR, multi-GPU rarely helps; focus on a single high-end GPU and lowering expensive settings (shadows, reflections).
  • If your CPU is maxed out, SLI won’t help; check CPU and VRAM usage too.
  • Disable overlays (Steam, Discord) when testing — they can affect frame timing.
  • Keep iRacing and graphics drivers current; performance patches happen regularly.

FAQs

Q: Will SLI increase my FPS in iRacing?
A: Almost never. You may see small FPS changes, but frame timing and stutter usually get worse.

Q: Can I use NVLink or professional multi-GPU setups with iRacing?
A: iRacing does not officially support common multi-GPU modes. Enterprise/pro setups may behave differently; discuss with iRacing support for rare pro configurations.

Q: Is AMD CrossFire supported?
A: No. CrossFire and similar multi-GPU consumer tech are not supported and are generally deprecated.

Q: My laptop shows low GPU usage — is SLI the issue?
A: More likely the system is using the integrated GPU. Force iRacing to “High performance” GPU in Windows Graphics settings and update drivers.

Wrap-up

iRacing runs best on one strong GPU. Disable SLI, make sure iRacing uses your dedicated card, update drivers, and monitor performance. If you still see issues, post your hardware and screenshots on the iRacing forums or contact support for targeted help.