docs(tech): add hardware inventory, fix DDR5->DDR4 error in health doc

- New docs/tech/hardware-inventory.md with full hardware specs:
  CPU (Ryzen 7 2700X), RAM (64GiB DDR4-2666, 4x16GiB), storage
  (512G NVMe PM9A1 + 500G SATA 840 EVO), GPU (GTX 1050 Ti),
  networking (Realtek 1Gbps + Tailscale), USB peripherals, chipset
- Fix workstation-health.md: DDR5-3200 was incorrect, actual DDR4-2666
- Note: primary disk at 93% usage (34G free)

docs/tech/hardware-inventory.md

@@ -0,0 +1,232 @@
+---
+description: >-
+  Complete hardware inventory for mw-pfeddersheim-workstation, gathered from
+  live system inspection on 2026-04-02.
+tags:
+  - hardware
+  - inventory
+  - workstation
+  - tech
+last_updated: '2026-04-02'
+---
+
+# Hardware Inventory: mw-pfeddersheim-workstation
+
+## System Overview
+
+| Field | Value |
+|-------|-------|
+| **Hostname** | mw-manjaro-pf |
+| **OS** | Manjaro Linux (kernel 6.12.77-1-MANJARO) |
+| **Architecture** | x86_64 |
+| **Desktop** | KDE Plasma 6.5.6 |
+| **SMBIOS** | 3.3.0 |
+
+## Motherboard & BIOS
+
+| Field | Value |
+|-------|-------|
+| **Manufacturer** | Gigabyte Technology Co., Ltd. |
+| **Model** | AX370M-DS3H-CF |
+| **Chipset** | AMD X370 Series |
+| **Form Factor** | Micro-ATX |
+| **BIOS Vendor** | American Megatrends International, LLC. |
+| **BIOS Version** | F53 |
+| **BIOS Date** | 2025-10-28 |
+| **ROM Size** | 16 MiB |
+| **Platform FW Rev** | 5.17 |
+| **UEFI** | Supported |
+
+## CPU
+
+| Field | Value |
+|-------|-------|
+| **Model** | AMD Ryzen 7 2700X Eight-Core Processor |
+| **Microarchitecture** | Zen+ (Pinnacle Ridge) |
+| **Family/Model/Stepping** | 23/8/2 |
+| **Cores/Threads** | 8C/16T |
+| **Base Frequency** | 3.7 GHz |
+| **Max Boost** | 3.9 GHz |
+| **Min Frequency** | 2.2 GHz |
+| **Frequency Scaling** | Enabled (77%) |
+| **L1d Cache** | 256 KiB (8x 32 KiB) |
+| **L1i Cache** | 512 KiB (8x 64 KiB) |
+| **L2 Cache** | 4 MiB (8x 512 KiB) |
+| **L3 Cache** | 16 MiB (2x 8 MiB) |
+| **NUMA Nodes** | 1 |
+| **Address Sizes** | 43-bit physical, 48-bit virtual |
+| **Virtualization** | AMD-V (SVM) supported |
+
+## Memory
+
+| Field | Value |
+|-------|-------|
+| **Total Installed** | 64 GiB (4x 16 GiB) |
+| **Total Online** | 66 GiB (includes reserved) |
+| **Type** | DDR4 |
+| **Speed** | 2666 MT/s |
+| **Voltage** | 1.2 V |
+| **Max Capacity** | 128 GiB (4 slots) |
+| **ECC** | None |
+| **Swap (zram)** | 16 GiB |
+
+### DIMM Layout
+
+| Slot | Channel | Size | Manufacturer | Part Number | Serial |
+|------|---------|------|-------------|-------------|--------|
+| DIMM 0 | P0 Channel A | 16 GiB | Kingston | 9905701-006.A00G | 9513FB63 |
+| DIMM 1 | P0 Channel A | 16 GiB | Samsung | M378A2K43CB1-CRC | 90D1E34A |
+| DIMM 0 | P0 Channel B | 16 GiB | Kingston | 9905701-006.A00G | 91131164 |
+| DIMM 1 | P0 Channel B | 16 GiB | Samsung | M378A2K43CB1-CRC | 90D1E345 |
+
+## Storage
+
+### Primary: NVMe SSD
+
+| Field | Value |
+|-------|-------|
+| **Device** | /dev/nvme0n1 |
+| **Model** | Samsung MZVL2512HCJQ-00B00 (PM9A1) |
+| **Capacity** | 512 GB |
+| **Interface** | PCIe NVMe 1.3 |
+| **Firmware** | GXA7401Q |
+| **Serial** | S675NF0R703667 |
+| **Utilization** | 436 GB used (85% of NAND) |
+| **Warning Temp** | 81 C |
+| **Critical Temp** | 85 C |
+
+#### Partition Layout
+
+| Partition | Size | FSType | Mount Point | Usage |
+|-----------|------|--------|-------------|-------|
+| nvme0n1p1 | 512M | vfat | /boot/efi | 1% |
+| nvme0n1p2 | 476.4G | ext4 | / | **93%** (34G free) |
+
+### Secondary: SATA SSD
+
+| Field | Value |
+|-------|-------|
+| **Device** | /dev/sda |
+| **Model** | Samsung SSD 840 EVO 500GB |
+| **Capacity** | 466 GB |
+| **Interface** | SATA |
+| **Mount** | /home/mw/models |
+| **FSType** | btrfs |
+| **Usage** | 6% (28G used, 437G free) |
+| **Quirks** | noncqtrim, zeroaftertrim, nodmalog (expected for 840 EVO) |
+
+### ZRAM
+
+| Device | Size | Use |
+|--------|------|-----|
+| zram0 | 16G | Swap (zstd/zsmalloc, 30% pool) |
+
+## GPU
+
+| Field | Value |
+|-------|-------|
+| **Model** | NVIDIA GeForce GTX 1050 Ti |
+| **PCI ID** | 10de:1c82 (rev a1) |
+| **PCI Bus** | 08:00.0 |
+| **VRAM** | 4096 MiB |
+| **Driver** | 575.64.05 |
+| **GPU Temp** | 47 C (at scan time) |
+| **Power Draw** | N/A (not reported) |
+| **Audio** | GP107GL HD Audio Controller [10de:0fb9] |
+
+## Networking
+
+### Physical Ethernet
+
+| Field | Value |
+|-------|-------|
+| **Interface** | enp5s0 |
+| **Controller** | Realtek RTL8111/8168/8211/8411 |
+| **PCI ID** | 10ec:8168 (rev 0c) |
+| **MAC** | e0:d5:5e:69:6f:c5 |
+| **Speed** | 1000 Mb/s (1 Gbps) |
+| **Status** | UP |
+
+### Virtual/Software Network
+
+| Interface | Type | Status | Purpose |
+|-----------|------|--------|---------|
+| tailscale0 | Point-to-point | UP | Tailscale VPN mesh |
+| docker0 | Bridge | DOWN | Docker default bridge |
+| br-1ba9d2122bb7 | Bridge | UP | Docker network |
+| br-87dbe859ba36 | Bridge | UP | Docker network |
+| br-1f223e02995b | Bridge | UP | Docker network |
+| br_vm_internal | Bridge | DOWN | libvirt VM network |
+
+## Audio
+
+| Device | PCI ID | Description |
+|--------|--------|-------------|
+| AMD HD Audio | 1022:1457 | Family 17h on-board audio |
+| NVIDIA HD Audio | 10de:0fb9 | GP107GL HDMI/DP audio |
+
+## USB Peripherals
+
+| Bus | Device | ID | Description |
+|-----|--------|----|-------------|
+| 001 | 002 | 0b0e:0422 | Jabra SPEAK 510 USB (speakerphone) |
+| 001 | 003 | 05e3:0727 | Genesys Logic microSD Reader/Writer |
+| 003 | 002 | 093a:2510 | Pixart Imaging Optical Mouse |
+| 003 | 003 | 0c45:636b | Microdia Terra HD1080PC Webcam |
+| 003 | 004 | 046a:00b0 | CHERRY Mechanical Keyboard |
+
+## Chipset Summary
+
+| Component | PCI ID | Description |
+|-----------|--------|-------------|
+| Host Bridge | 1022:1450 | AMD Family 17h Root Complex |
+| IOMMU | 1022:1451 | AMD Family 17h IOMMU |
+| PCIe GPP | 1022:1453 | AMD PCIe GPP Bridge |
+| USB 3.1 xHCI | 1022:43b9 | AMD X370 Chipset USB |
+| SATA | 1022:43b5 | AMD X370 Chipset SATA |
+| SATA (FCH) | 1022:7901 | AMD FCH SATA AHCI |
+| SMBus | 1022:790b | AMD FCH SMBus |
+| PSP | 1022:1456 | AMD Platform Security Processor 3.0 |
+| ISA Bridge | 1022:790e | AMD FCH LPC Bridge |
+| NVMe | 144d:a80a | Samsung PM9A1/PM9A3/980PRO |
+
+## Onboard Devices
+
+| Type | Description | Status |
+|------|-------------|--------|
+| Video | To Be Filled By O.E.M. | Enabled |
+| Ethernet | Broadcom 5762 | **Disabled** (Realtek used instead) |
+
+## Disk Usage Summary
+
+| Mount | Device | Total | Used | Free | Use% |
+|-------|--------|-------|------|------|------|
+| / | /dev/nvme0n1p2 | 468G | 411G | 34G | **93%** |
+| /boot/efi | /dev/nvme0n1p1 | 511M | 328K | 511M | 1% |
+| /home/mw/models | /dev/sda1 | 466G | 28G | 437G | 6% |
+
+## Observations
+
+1. **Primary disk at 93%** - consider cleanup or expansion. Only 34G free on root.
+2. **DDR4 not DDR5** - previous `workstation-health.md` incorrectly listed DDR5-3200. Actual: DDR4-2666.
+3. **Mixed RAM kits** - 2x Kingston + 2x Samsung modules. Both rated 2666 MT/s, dual-channel active.
+4. **GPU aging** - GTX 1050 Ti (2016 architecture) with 4GB VRAM. Adequate for dev work, not for ML.
+5. **Samsung 840 EVO quirks** - Known SATA quirks for this older SSD model (non-critical).
+6. **BIOS up to date** - F53 from 2025-10-28 is recent.
+7. **No ECC memory** - Non-ECC unbuffered DIMMs.
+
+## Data Collection Method
+
+```bash
+lscpu                              # CPU details
+sudo dmidecode -t memory           # DIMM info
+sudo dmidecode -t baseboard        # Motherboard
+sudo dmidecode -t bios             # BIOS/firmware
+lsblk -o NAME,SIZE,TYPE,FSTYPE,MOUNTPOINT,MODEL,TRAN
+lspci -nn                          # All PCI devices
+lsusb                              # USB peripherals
+nvidia-smi --query-gpu=...         # GPU status
+smartctl -a /dev/nvme0n1           # NVMe health
+df -h                              # Disk usage
+ethtool enp5s0                     # Ethernet speed
+ip link show                       # Network interfaces

docs/tech/workstation-health.md

@@ -14,7 +14,7 @@ last_updated: '2026-03-17'
 ## System Specifications
 
 - **CPU**: AMD Ryzen 7 2700X (16 threads) @ 3.9GHz max
-- **Memory**: 62 GiB DDR5-3200 MHz
+- **Memory**: 64 GiB DDR4-2666 MT/s (4x 16 GiB, 2x Kingston + 2x Samsung)
 - **Primary Disk**: 512 GB NVMe SSD (Samsung MZvl2512HCJQ)
 - **Secondary Disk**: 500 GB SATA SSD (Samsung 840 EVO) -> `/home/mw/models`
 - **OS**: Manjaro Linux (Kernel 6.12)