PC Drivers & Software

[fatp1ngu]

Hello,

I have been experiencing issues with very high CPU load on one core/thread and its constantly pinned to almost 100% in Task Manager:

I was able to use Process Explorer to see what was running on the core to cause the constant load. This showed me it is System Interrupts:

Tried updating drivers, removed all USB devices one at a time to see if went down but nothing. Ran Windows Performance Recorder and then Windows Performance Analyser which shows that rcbottom.sys is the one causing the interrupts:

I do not use RAID (at least not consciously, I've never set it up) and my specs are:

Type Hardware

CPU	AMD Ryzen 5900X
Memory	4x8GB Corsair Vengeance LPX DDR4 3200 MHz C16
Motherboard	Gigabyte B550 AORUS ELITE
GPU	EVGA RTX 3080 FTW 3 Ultra 10G
PSU	Corsair RM850 (2021) - 850W
Main boot drive	Kioxia LTC10Z480GG8 EXCERIA 480 GB 2.5 Inch SSD
HDD Storage	Seagate BarraCuda 2TB 7200 RPM
NVME (for games)	Kingston 1TB A2000 M2 NVMe SSD
Operating System	Windows 11 Pro - Version 21H2
	OS Build: 22000.739

The question I have is - can I remove rcbottom.sys or can I update it? I installed the AMD RAID Utility from my Motherboard's drivers here: https://www.gigabyte.com/Motherboard/B550-AORUS-ELITE-rev-10/support#support-dl-driver

I hoped that would update the driver maybe, but nothing has improved.

I have tried to stop it from running at boot but it then causes a BSOD error with Stop Code: INACCESSIBLE BOOT DEVICE. Windows repair gets it to boot, but it re-activates this so makes no difference.

The constant load is hurting in games, temps etc. so if I could fix it, it would be great. Any help is much appreciated.

[fatp1ngu · Accepted solution]

This is now resolved. Feel stupid at how easy it was in the end.

In Device Manager saw that the Storage Controller was a StoreMI one. Went to Update Driver > From Local Files > Selected the Standard AHCI one and thats it.

Reboot and fixed. 

[Nafryti]

I have no idea when this StoreMI driver was installed, but I ended up needing to do this after attempting to run Prime95 and a BSOD happening on rcbottom.sys 

I'm also noticing lower CPU temps at idle in ambient room temps as well.  Would seem the StoreMI driver needs a lot more testing before it's a stable alternative to the old standard driver.

UPDATE: I ran P95 for a solid minute without any hiccup in performance or BSOD.  This is blatantly a StoreMI issue, will hope AMD fixes their driver.