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How to Force 64 Bit Iracing

Learn how to force 64 bit iracing: check Windows is 64-bit, run the 64-bit executable, update the launcher, and fix memory or performance issues fast for iRacing drivers.

If you want to force iRacing to run in 64-bit mode, the short answer is: run the 64-bit client executable (iRacingSim64.exe), make sure your Windows is 64-bit, and update the iRacing launcher. You’re in the right place — below are clear, actionable steps so you can fix this fast.

Quick Answer: how to force 64 bit iracing

Most of the time you force 64-bit by launching iRacing with the 64-bit executable (iRacingSim64.exe) or letting the official launcher update itself. Also ensure your PC runs a 64-bit Windows build; 64-bit iRacing won’t run on 32-bit Windows.

What’s really going on

iRacing provides a 64-bit client that can use more memory and avoid crashes or out-of-memory errors in big sessions. If you end up running a 32-bit process you’ll see limits (and sometimes stability or performance problems). Windows marks 32-bit apps as “*32” in Task Manager; 64-bit apps don’t carry that suffix. Forcing the 64-bit client ensures the sim can use more RAM and modern CPU features.

Step-by-step fix

  1. Check Windows: open Settings → System → About and confirm “System type” says 64-bit operating system. If not, you can’t run 64-bit iRacing until you upgrade Windows.
  2. Update the launcher: open the iRacing launcher, let it fully update, then click Launch. The launcher installs the correct client automatically in most cases.
  3. Run the 64-bit exe directly: go to your iRacing installation folder (commonly C:\Program Files (x86)\iRacing), find iRacingSim64.exe and double-click it to start the 64-bit client.
  4. Verify in Task Manager: while iRacing runs, open Task Manager → Details tab. If the process name is iRacingSim64.exe and there’s no “*32” suffix, you’re running 64-bit.
  5. Repair or reinstall if needed: if you only see a 32-bit executable or the 64-bit exe won’t start, run the launcher’s Repair option or reinstall iRacing from your account downloads.
  6. Check add-ons/plugins: remove or update old third-party plugins that might be 32-bit only. They can sometimes interfere with the client starting properly.

Extra Tips / Checklist

  • Always run the launcher as your regular user (no need for admin unless installing).
  • Keep graphics drivers up to date—driver issues can look like 64-bit crashes.
  • If you get “out of memory” errors, 64-bit will usually fix that; if not, check for memory leaks in mods.
  • Don’t try compatibility-mode tricks in the exe properties — they can break the 64-bit launch.
  • If you use multiple monitors or overlays, disable them briefly to confirm they’re not forcing a fallback.

FAQs

Q: How do I know iRacing is running 64-bit?
A: Open Task Manager → Details. If the process is iRacingSim64.exe and it doesn’t have “*32” next to it, it’s 64-bit.

Q: Can I force 64-bit if Windows is 32-bit?
A: No. You must install a 64-bit version of Windows to run the 64-bit iRacing client.

Q: The launcher still starts a 32-bit process — what now?
A: Update the launcher, run Repair, then run iRacingSim64.exe directly. If the 64-bit exe is missing, reinstall iRacing.

Q: Will 64-bit fix crashes and memory errors?
A: Often yes—64-bit lets the client use more RAM, which fixes many out-of-memory crashes. If crashes persist, check drivers and mods.

Short wrap-up

Forcing iRacing to 64-bit is usually just running iRacingSim64.exe and keeping the launcher updated. Confirm Windows is 64-bit, verify the process in Task Manager, and repair/reinstall if necessary. Next session: test a long practice or large field race to confirm stability.