What is DCH-ASYNC?
Asymmetry of two-channel memory connection ranks as a critical-severity system memory (RAM) issue in our database. Although the memories run in Dual-Channel, they are poorly matched, which limits throughput. Typical causes include different modules in one board, frequency too high and dust in slot. The steps below are ordered to resolve this efficiently.
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
The highest-success first step is Disable XMP profile in BIOS, which targets the most common trigger behind DCH-ASYNC.
-
2
Clean the RAM contacts with a school eraser
Where the fault comes back, look to the later steps — they're built around uncommon ram instability triggers.
-
3
Update BIOS for better compatibility
"Update BIOS for better compatibility" is the next step worth ruling out for DCH-ASYNC.
Commands & Diagnostics
mdsched.exe
wmic memorychip get capacity
Frequently Asked Questions
In most cases, different modules in one board is behind DCH-ASYNC. Poor quality CPU controller, frequency too high and dust in slot can trigger it too.
"Disable XMP profile in BIOS" clears up most DCH-ASYNC reports by itself. The remaining steps above cover what's left.
Yes — DCH-ASYNC is a critical-severity error and can lead to data loss or hardware damage if it's ignored. Don't put off the fix steps above.
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 DCH-ASYNC 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