2026 SFF PC - Ryzen AM4 Build

2026_sff_build.md

2026 SFF PC - Ryzen AM4 Build

I've been wanting to do a small form factor build for a while. Since I already had a spare 5800X3D, RAM, and storage sitting around, it felt hard to justify not putting them to use. With hardware prices where they are today, investing in a case, PSU, and mini-ITX motherboard seemed like a much better value than letting those parts collect dust.

Components

• CPU: AMD Ryzen 7 5800X3D
• CPU Cooler: Thermalrlght AXP120-X67 Low Profile
• Motherboard: Gigabyte B550I AORUS PRO AX
• GPU: ASUS Dual Radeon RX 9070 XT 16GB
• RAM: G.SKILL Ripjaws V Series 32GB
• Storage
  • Samsung 990 PRO 1TB
  • Samsung 970 EVO 2TB
• Case: Fractal Design Terra Jade - Wood Walnut
• PSU: Cooler Master V850 SFX Gold 850W
• OS
  • Bazzite Linux

Issues & Resolutions

• WiFi IWD disabled by default
• WiFi Lag & Latency

Images

Bazzite Immediate Wake from Suspend (Gigabyte B550I AORUS PRO AX + Samsung 980 Pro)

Symptoms

systemctl suspend immediately resumed.

Logs showed:

• PM: suspend entry (deep)
• ACPI: PM: Waking up from system sleep state S3
• xhci_hcd 0000:02:00.0: xHC error in resume, USBSTS 0x401, Reinit

Root Cause

The AMD PCIe root bridge (0000:00:01.1) associated with the Samsung 980 Pro NVMe (0000:01:00.0) was configured as a wake source, causing immediate resume from S3.

Temporary Fix

Disable wake on both the PCIe bridge and NVMe device:

echo disabled | sudo tee /sys/bus/pci/devices/0000:00:01.1/power/wakeup
echo disabled | sudo tee /sys/bus/pci/devices/0000:01:00.0/power/wakeup

Verify:

cat /sys/bus/pci/devices/0000:00:01.1/power/wakeup
cat /sys/bus/pci/devices/0000:01:00.0/power/wakeup

Both should report:

disabled

Result

Suspend works normally.

• USB mouse wake continues to function.
• No kernel parameters required.
• No need to disable XHC0.
• No need to enable ErP.
• Persistent Fix

Create /etc/systemd/system/disable-pcie-wakeup.service:

[Unit]
Description=Disable wakeup on AMD PCIe bridge and Samsung NVMe
After=local-fs.target

[Service]
Type=oneshot
ExecStart=/usr/bin/sh -c 'echo disabled > /sys/bus/pci/devices/0000:00:01.1/power/wakeup'
ExecStart=/usr/bin/sh -c 'echo disabled > /sys/bus/pci/devices/0000:01:00.0/power/wakeup'
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

Enable:

sudo systemctl daemon-reload
sudo systemctl enable disable-pcie-wakeup.service

SteamOS Suspend Issue Resolution

Create /etc/systemd/system/disable-wakeup.service:

[Unit]
Description=Disable problematic wake sources
After=multi-user.target

[Service]
Type=oneshot
ExecStart=/bin/sh -c 'echo GPP0 > /proc/acpi/wakeup; echo XHC0 > /proc/acpi/wakeup'
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

sudo systemctl daemon-reload
sudo systemctl enable disable-wakeup.service
sudo systemctl start disable-wakeup.service