Linux desktop running Slackware64 15 (kernel 5.15.38) with ZFS-on-Linux :
This PC is meant as a testbed for Linux and ZFS related experiments and is also used as a desktop machine

Mainboard : Asrock B365M Pro4, MicroATX, socket 1151, 2 PCIe 3.0 x16, 1 PCIe 3.0 x1
6x SATA3, 2x Ultra M.2 ((PCIe Gen3 x4 & SATA3), 2x USB2.0, 4x USB3.0, 1x USB3.1 gen1 type C, Intel i219v GB lan
Graphics Output Options: D-Sub, DVI-D, HDMI 1.4
- 2 x PCI Express 3.0 x16 Slots (PCIE1: x16 mode; PCIE4: x4 mode)
- 1 x PCI Express 3.0 x1 Slots (Flexible PCIe)
Intel i3-9100 base 3.6GHz/turbo 4.2GHz Coffee Lake
6MB L2 cache, Socket 1151
4 cores 4 threads, TDP 65W
Intel® HD Graphics 630, DirectX 12. Resolution : 4k @60Hz
16GB : 2x 8GB 3200MHz CMK16GX4M2B3200C16
Corsair Vengeance LPX DDR4-3200 memory
Noctua NH-L9x65 Semi-Low profile CPU cooler
For boot :
Crucial RealSSD C300 128GB
• 128GB SATA 6Gb/s
• Sequential READ: up to 355MB/s
• Sequential WRITE: up to 140MB/s
• Random 4k READ: 60K IOPS

HighPoint RocketRaid 2720SGL
PCI-E 8x 2.0
2 sf8087 / 8sata interfaces
In the 1st PCI-E 16x slot with 8 lanes
Harddisks :

1x 128GB SSD Crucial C300 boot.
12x 3T Seagate ST3000DM001 SATA

Linux ZFS Raid Z2 filesystem (2 disk redundancy)
(12x3TB disk RAIDZ2 36TB bruto +-30TB netto)
Lian Li PC60 PlusII case
Lian-Li 3-in-3 Hotplug sata drive cage
LianLi EX-H33A
Lian Li cage EX-36A2
Iiyama B2712HDS 27inch LCD widescreen monitor
1920x1080 (HDMI + DVI + DSUB)
Corsair RM550x 550Watt (2018)
Semi passive, 80plus Gold certified power supply
Network Card : Intel X550-T1 :
10 Gbe over UTP / RJ45
ZFS-on-Linux / OpenZFS 2.1 on Slackware64 15, kernel 5.15.38 with

Inside view of this PC (one extra 4x3 Lian Li bay on the bottom of the cage :

With Highpoint Rocket 2720 card with 8 extra sata connections (via 2x SF8087 minisas breakout cable) :