What is IMP-CAL-FAIL?
Memory calibration failure on PC startup ranks as a critical-severity system memory (RAM) issue in our database. The motherboard is stuck in a loop while calibrating the memory signal impedance. The usual suspects are poor quality CPU controller, frequency too high and dust in slot. Follow the steps below to fix it.
Common Causes
- Different modules in one board
- Poor quality CPU controller
- Frequency too high
- Dust in slot
Step-by-Step Fix Guide
-
1
Disable XMP profile in BIOS
Begin with Disable XMP profile in BIOS; it's the step that resolves IMP-CAL-FAIL for the largest share of reported cases.
-
2
Clean the RAM contacts with a school eraser
Repeat occurrences typically trace back to less obvious ram instability factors, addressed in the steps ahead.
-
3
Update BIOS for better compatibility
For lingering IMP-CAL-FAIL cases, "Update BIOS for better compatibility" is worth running through.
Commands & Diagnostics
mdsched.exe
wmic memorychip get capacity
Frequently Asked Questions
IMP-CAL-FAIL is most often triggered by different modules in one board. Other reports point to poor quality CPU controller, frequency too high and dust in slot as contributing factors.
Try "Disable XMP profile in BIOS" first — it resolves most IMP-CAL-FAIL cases on its own. Only work through the rest of the guide above if it comes back.
IMP-CAL-FAIL is rated critical severity in our database. It's worth acting on quickly rather than letting it recur.
You shouldn't need to. Work through the guide above first — a reinstall is only worth considering if none of those steps help.
MemTest86 is strongly recommended if IMP-CAL-FAIL occurs repeatedly. It runs overnight and tests all RAM slots independently. Even a few errors in MemTest indicate faulty RAM that should be replaced.
Still Need Help?
Search our full database of 535+ documented PC errors for more solutions and step-by-step repair guides.
Search Error Database