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[Solved] Sudden FPS Drop in LoL: i3-4160, GTX 750 Ti, MSI H81M-P33, Corsair VS450, 4GB RAM, Win7

dawid2111 20754 14
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  • #1 17420412
    dawid2111
    Level 9  
    Hello, let me introduce my PC hardware first:
    Motherboard: MSI H81M-P33 (MS-7817)
    Processor: i3-4160 3.6GHz
    Graphics: NVIDIA GForce gtx 750 ti, memory size 1024MB
    Power supply: CORSAIR VS450
    4GB RAM memory 1 chip

    Windows 7

    Well, after a few days of not using the computer (the computer was on for 2 days) something happened to fps.
    Playing League of Legends I have an average of 45 fps, where previously I was 75. I used to have a similar problem, but after resetting the BIOS everything is back to normal, but now it did not help. I scanned Malwarebytes (I cleared the bugs), HD tune showed everything ok in health. I also noticed a lot of hardware errors in the resource monitor.

    I have a HWinfo log and some afterburner screenshots.
    Attachments:
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    • test233.rar (24.28 KB) You must be logged in to download this attachment.
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  • #2 17421032
    enhanced
    Level 43  
    The CPU drops to 800MHz under load and hence such a weak FPS. Why I do not know - you did not combine in the power profile? Reset bios and possibly insert photos from bios settings.
  • #3 17421075
    dawid2111
    Level 9  
    As for the power profile, I did nothing. It happened overnight. I did a BIOS reset. But it didn't help.
    Attachments:
    • Sudden FPS Drop in LoL: i3-4160, GTX 750 Ti, MSI H81M-P33, Corsair VS450, 4GB RAM, Win7 20180903_202924.jpg (1.45 MB) You must be logged in to download this attachment.
    • Sudden FPS Drop in LoL: i3-4160, GTX 750 Ti, MSI H81M-P33, Corsair VS450, 4GB RAM, Win7 20180903_202912.jpg (1.49 MB) You must be logged in to download this attachment.
  • #4 17421083
    enhanced
    Level 43  
    Provide a screen with hardware errors.
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  • #5 17421095
    dawid2111
    Level 9  
    screen, I don't know if I did it right
    Attachments:
    • Sudden FPS Drop in LoL: i3-4160, GTX 750 Ti, MSI H81M-P33, Corsair VS450, 4GB RAM, Win7 123333.png (113.66 KB) You must be logged in to download this attachment.
  • #6 17421111
    enhanced
    Level 43  
    It's probably from using Swap on HDD.

    Fire up the throttlestop and set its multiplier to the max, save and turn on. Fire up the built-in TSBench and see if it will keep the timing or it will immediately drop to 800. All power cables will be properly connected to the motherboard?
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  • #7 17421141
    dawid2111
    Level 9  
    Could you tell me where this multiplier is?
  • #8 17421146
    enhanced
    Level 43  
    You give the multipler set to the maximum and mark the bird next to it. THIS is in the main TS window.
  • #9 17421155
    dawid2111
    Level 9  
    I did as you said and it hasn't gone down to 800 not once
  • #10 17421161
    enhanced
    Level 43  
    Try playing with TS running in the background. Possibly make logs in hwinfo.
  • #11 17421199
    dawid2111
    Level 9  
    Now the fps was a steady 75 and the game ran smoothly. But why without a throttle the foot drops?
    Attachments:
    • nelow.rar (16.71 KB) You must be logged in to download this attachment.
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  • #12 17421248
    enhanced
    Level 43  
    I do not know. Maybe the sensors are cheating on the temperature and the board is limiting the CPU power.

    Do you have the latest bios version? Maybe it's worth uploading the newest one or re-uploading it when it's already the newest?
  • #13 17421252
    dawid2111
    Level 9  
    The last time, probably a year ago, I did a bios update, I will try to update.
    Is it safe to use the throttlestop?
  • #14 17421352
    enhanced
    Level 43  
    Yes, I am still riding it because I have full control over the CPU multiplier, additionally I am spinning it or doing undervolt (which in principle I do not do because lowering the multiplier is enough for me).
  • #15 17424541
    dawid2111
    Level 9  
    Even though the problem has not completely disappeared, I am using a throttlestop to compensate for the drops. Thank you very much !
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Topic summary

✨ The user experienced a sudden drop in FPS while playing League of Legends, decreasing from 75 to 45 FPS. The hardware setup includes an i3-4160 CPU, GTX 750 Ti GPU, MSI H81M-P33 motherboard, 4GB RAM, and a Corsair VS450 power supply, running on Windows 7. Initial troubleshooting included a BIOS reset and malware scans, but the issue persisted. Suggestions from the community included checking power profiles, using ThrottleStop to manage CPU performance, and ensuring proper power connections. After applying ThrottleStop, the user reported a return to stable 75 FPS, although the underlying cause of the FPS drop remained unclear. The user plans to update the BIOS as a further step.
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FAQ

TL;DR: On i3-4160/H81 rigs, FPS drops stem from the CPU downclocking to 800 MHz; “The CPU drops to 800MHz under load.” Lock the multiplier with ThrottleStop to regain smooth play. For Windows 7 gamers seeing sudden LoL FPS drops. [Elektroda, enhanced, post #17421032]

Why it matters: A locked 800 MHz clock tanks game performance; holding the proper multiplier restores smooth, consistent FPS.

Quick Facts

Why did my LoL FPS drop suddenly on an i3-4160/GTX 750 Ti?

Because the CPU downclocked to 800 MHz under load, crippling game performance. As the helper put it, “The CPU drops to 800MHz under load and hence such a weak FPS.” Hold the correct multiplier to restore normal speed. This behavior explains sudden, sustained frame loss despite unchanged game settings. [Elektroda, enhanced, post #17421032]

How do I check if my CPU is stuck at 800 MHz?

Use ThrottleStop. Set the CPU multiplier to maximum, save, and enable it. Then run the built-in TSBench to watch clock behavior under load. If it immediately drops to 800 MHz, you’ve confirmed throttling. This quick test isolates CPU frequency issues from GPU or driver problems. “Fire up the built-in TSBench and see if it will keep the timing.” [Elektroda, enhanced, post #17421111]

Should I keep ThrottleStop running while I play?

Yes. Run ThrottleStop in the background so it can hold the multiplier during gameplay. Also record a session using HWiNFO logging to confirm stable clocks and temperatures. This combination makes drops visible and helps validate that the fix is sticking. “Try playing with TS running in the background.” [Elektroda, enhanced, post #17421161]

What FPS improvement did the OP see after enabling ThrottleStop?

With ThrottleStop active, the OP reported a steady 75 FPS and smooth gameplay in League of Legends. This shows that stabilizing the CPU multiplier directly restored real-world performance. It’s a clear validation that CPU frequency, not GPU settings, caused the problem. [Elektroda, dawid2111, post #17421199]

Where is the ThrottleStop multiplier setting, and how do I set it?

It’s in the main ThrottleStop window. How-To:
  1. Open ThrottleStop and stay on the main window.
  2. Set the CPU multiplier to the maximum value shown.
  3. Tick the checkbox next to the multiplier to apply it. This ensures the CPU runs at the intended performance state during load. [Elektroda, enhanced, post #17421146]

Is ThrottleStop safe for daily use?

Yes. An experienced user runs it continuously to control the CPU multiplier. They noted it provides stable control, with undervolting optional. “Yes, I am still riding it because I have full control over the CPU multiplier.” Use sensible settings and monitor temps to stay safe. [Elektroda, enhanced, post #17421352]

Will resetting the BIOS help with sudden throttling?

It helped once for the OP, restoring performance after a similar issue. However, it did not resolve the latest occurrence. That indicates BIOS reset can be a temporary fix, not a guaranteed solution. Try it once, then re-evaluate behavior under load. [Elektroda, dawid2111, post #17420412]

Should I update or reflash the BIOS if the issue persists?

Yes. Verify you have the latest BIOS. If you already do, consider reflashing it. “Maybe it’s worth uploading the newest one or re-uploading it when it’s already the newest?” Firmware fixes and recalibrations can resolve misbehavior, including misleading sensor data. [Elektroda, enhanced, post #17421248]

Could Windows power settings be the cause of the 800 MHz lock?

Check your power profile and ensure it wasn’t changed. The helper directly asked about this because restrictive profiles can limit CPU behavior. Set appropriate performance options before deeper troubleshooting. This simple step prevents unnecessary downclocking during games. [Elektroda, enhanced, post #17421032]

What do “hardware errors” in Resource Monitor mean here?

They were attributed to paging activity on the HDD, not failing parts. As noted: “It’s probably from using Swap on HDD.” That context prevents misdiagnosing routine OS behavior as hardware faults. Reduce paging by closing apps or adding RAM to lighten disk usage. [Elektroda, enhanced, post #17421111]

What physical connections should I check inside the PC?

Confirm all motherboard power cables are firmly seated. That includes the 24-pin ATX and CPU power connector. Loose connections can cause unstable power delivery and frequency drops under load. Reseating these is a fast, zero-cost sanity check before advanced steps. [Elektroda, enhanced, post #17421111]

How should I log data to troubleshoot FPS drops?

Enable HWiNFO logging while you game to capture CPU clocks and temperatures. Keep ThrottleStop running so you can correlate multiplier behavior with FPS. Logs provide objective evidence to validate fixes and guide next steps. “Possibly make logs in hwinfo.” [Elektroda, enhanced, post #17421161]

Is this a permanent fix, or just a workaround?

For the OP, ThrottleStop mitigated the issue but didn’t fully eliminate it. They continue using it to compensate during dips. That marks it as a practical workaround while you pursue root-cause steps like BIOS updates. [Elektroda, dawid2111, post #17424541]

Should I undervolt, or just control the multiplier?

Controlling the multiplier is typically enough here. The helper noted they rarely undervolt because “lowering the multiplier is enough for me.” Focus on stable, correct clocks first; consider undervolting only if needed for thermals. [Elektroda, enhanced, post #17421352]
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