Resolve Hyper Transport Sync Flood Error

The ‘Hyper Transport sync flood error’ occurs during the initial startup screen, immediately after the user starts up the PC. The booting sequence then completes normally using the default values and it works fine with the only problem being that the date & time is reset after each system startup.

What’s causing the ‘Hyper Transport sync flood error’?

  • Faulty CMOS battery – In the vast majority of cases, this issue will occur due to an old or faulty CMOS battery that is unable to store the information in between system startups. If you notice that your date & time gets reset at every startup, you should be able to fix the issue by cleaning the CMOS battery or by replacing it with a brand new one.
  • Unstable overclocked frequencies – This particular error can also occur in instances where signals on the HT bus are in a state of instability that makes normal operations impossible. If this scenario is applicable, you should be able to stop the error from ever occurring again by returning all overclocked frequencies and voltages to the default.
  • Insufficient power supplied by PSU – If you’re operating with overclocked frequencies or you’ve recently added a more power-demanding component, it’s also possible that your current PSU is unable to supply enough power. In this case, you can resolve the issue by disconnecting non-essential components and devices or by upgrading to a more powerful PSU.
  • BIOS Glitch – As it turns out, this issue can also occur due to an improper BIOS version or a glitch that is currently affecting your system’s stability. ASUS had a BIOS issue that triggered this problem with certain configurations. In this case, you can fix the problem by installing the latest BIOS version according to your motherboard and manufacturer.

Method 1: Clearing / Replacing the CMOS battery

If you notice that the date & time is reset after each computer startup, the first suspect that you should have in mind is the CMOS battery. This small but important component is located on the motherboard and is typically a CR2032 button cell.

The CMOS (Complementary Metal Oxide Semiconductor) battery (also known as RTC or NVRAM) is responsible for storing information ranging from time and date to system hardware settings. An inconsistency caused by this component is typically signalled by the computer’s inability to maintain the date & time between startups.

If this scenario is applicable to your current scenario and you suspect that you’re dealing with a faulty CMOS battery, you should be able to fix the issue by clearing the CMOS battery or replacing it altogether in case the issue repeats.

Here’s a quick guide on doing this:

Note: The steps below should be applicable regardless of your Windows version or your PC configuration.

  1. Turn off your computer completely and ensure that it’s not currently plugged into a power outlet.
  2. Next, remove the side cover and equip your main hand with a static wristband (if you have one). This will ground you to the frame of the computer and evens out the electrical energy, which ensures that you don’t produce any damage to your PC’s components.
  3. Take a look at your motherboard and identify the CMOS battery. It should not be hard to spot. Once you see it, use your fingernail or a non-conductive screwdriver to remove it from the slot.
    Removing the CMOS battery

    Note: If you have a spare CMOS battery laying around, replace the current one to ensure that you’re not dealing with a faulty battery. If you don’t, clean it thoroughly to ensure that there’s no dirt inhibiting the connectivity with the motherboard.

  4. Wait for a couple of minutes before putting it all back together and powering your computer again. Next, do two consecutive restarts and see if the date & time is preserved and you’re still encountering the same ‘Hyper Transport sync flood error’ error.

If you did this and you’re still seeing the ‘Hyper Transport sync flood error’ error at every system startup, move down to the next potential fix below.

Method 2: Disable Overclocking (if applicable)

In other cases, the sync flood error will be initiated in instances where the signals on the HT bus are in a state that makes the normal operations impossible to perform. As you can imagine, there can be many hardware faults that might cause this problem.

But in reality, in most cases, it will occur if the BIOS has configured the CPU or chipset incorrectly – most likely due to exaggerated overclocked frequencies that are causing general system instability. It’s also possible that due to your overclocking, your PC is unable to supply enough power.

A couple of affected users that were also dealing with this problem have reported that the issue was finally resolved after they reduced their overclocking frequencies for both their CPU and GPU. For starters, reverting to the default values will allow you to figure out if the problem is indeed occurring due to overclocking.

Adjusting overclocking frequencies

Once you manage to reset the overclocked frequencies to the default, do a couple of consecutive restarts and see if the ‘Hyper Transport sync flood error’ error is still occurring.

In case the same error message is still occurring at every system startup, move down to the next method below.

Method 3: Replacing the PSU

If you can’t do without overclocked frequencies and you previously confirmed that the issue is no longer occurring while you revert back to the default values, it’s almost certain that you need to upgrade to a more powerful PSU.

In case the current PSU is under-powered, you will keep encountering the ‘Hyper Transport sync flood error’ error. This happens because your system needs more power than your PSU is capable of supplying.

Under-equipped PSU

One potential way of fixing the issue without having to upgrade to a better PSU is to remove all devices that are not essential to the functioning of your PC (non-critical peripherals, additional HDDs, optical drives, etc.). Also, try to slightly bring the voltages down if you have overclocked your GPU or CPU and see if the issue goes away.

If this doesn’t work, you have no choice but to upgrade to a more powerful PSU that is capable of supplying enough power to your system.

In case you’re still encountering the issue or this method wasn’t applicable in your case, move down to the next method below.

Method 4: Updating to newer BIOS version

As it turns out, this particular issue can also occur due to an improper or glitched version of your BIOS. ASUS had a BIOS issue of this kind that will ultimately end up triggering the ‘Hyper Transport sync flood error’ error at every system startup, even though the CMOS battery was perfectly healthy.

It’s entirely possible that your current BIOS version is causing the problem. If a new version is available, you should update it to the latest and see if the same problem is still occurring. But keep in mind that the steps of updating your BIOS version will be different depending on your manufacturer.

Typically, every manufacturer has its own proprietary software that needs to be used when updating BIOS. Asus has E-Z Flash, MSI has MFlash and the examples can continue.

Updating your bios version

If you want to update your BIOS version, start by looking for specific steps related to your particular model. But if you’re not confident in your technical abilities, the best way to go is to take it to an IT technician so you don’t run the risk of bricking your system.

Kevin Arrows
Kevin is a dynamic and self-motivated information technology professional, with a Thorough knowledge of all facets pertaining to network infrastructure design, implementation and administration. Superior record of delivering simultaneous large-scale mission critical projects on time and under budget.

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Resolve Hyper Transport Sync Flood Error

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