A serious unknown error

ok so after using speedfan for a while, I haven't heard any sound crackling while playing games now.
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Acer M802
OS
Win 7 & 10 x64
CPU
Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66GHz (4 CPUs), ~2.7GH
Motherboard
MB.SCQ07.002 MB KIT G43 ICH10R HMII EUPLOT6 ECS R
Memory
8GB DDR2
Graphics Card(s)
HD 6970 2 GB
Sound Card
Realtek ALC 888s
Monitor(s) Displays
AOC
Screen Resolution
1920x1080 60hz
Hard Drives
WD Black 1 TB

WD My Book Essential 1 TB external HDD
PSU
Corsair TX650m
Case
CM 690 II Advanced mid tower
Cooling
fan
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