Corsair

ONE i300

CPU i9 12900K

GPU 3080

Max RAM 64GB

Drives 2

From $3,020

Seller Corsair

The Corsair ONE i300 is a mini PC powered by the Intel i9 12900K (12th gen). It features 8 performance cores and 24 threads and a LGA1700 socket. Graphics are handled by the discrete NVIDIA 3080. Supports up to 64GB of RAM across 2 slots at 4800 MT/s. Storage capacity of up to 2 drives including 1 NVMe, 1× 2.5" SATA. Connectivity includes USB4 40Gbps, HDMI 2.1. Networking features 1 Ethernet port (up to 2.5G). Dimensions: 380 × 200 × 173mm (13.15L). Uses a SFX PSU (750W).

CPU & Performance

CPUi9 12900K

Generation12th

P-Cores8

Threads24

Single-core82

Multi-core61

SocketLGA1700

GPU

GPU3080

Discrete GPUYes

Integrated GPUYes

eGPU supportNo

RAM

Max RAM64GB

RAM slots2

Max speed4800 MT/s

ECC supportNo

Storage

Max drives2

NVMe slots1

Gen4 x41

2.5" SATA1

SD cardNo

Ports & Connectivity

HDMI 2.11

USB4 40Gbps2

Max displays6

Network

Max Ethernet1G

2.5G ports1

vProN

Physical

Dimensions380 × 200 × 173 mm

Volume13.15L

Fan size120mm

Warranty2 yr

Power

PSU typeSFX

PSU750W

Additional

Recommended for gaming, GPU-accelerated creative work, 3D or graphics-heavy tasks, and larger multitasking workloads. Consider Corsair ONE i300 if you want a larger performance-focused mini PC built around its listed Intel i9 12900K processor and NVIDIA 3080 discrete GPU plus integrated graphics. It is performance-oriented rather than ultra-compact, so it is better suited to users who can accept a larger mini PC chassis.

Corsair ONE i300 features Intel i9 12900K with NVIDIA 3080 discrete GPU plus integrated graphics, offering 1× 2.5G Ethernet and USB4 and HDMI 2.1. CPU details include 12th CPU generation, 8 performance cores, and 24 threads. Memory support includes up to 64GB RAM across 2 slots at 4800 MT/s. Storage support includes up to 2 storage drives including 1 NVMe SSD slot, 1× PCIe Gen4 x4 NVMe, and 1× 2.5-inch SATA bay. Display support includes support for up to 6 displays. Port connectivity includes 2× USB4 40Gbps, 1× HDMI 2.1, and 1× PCIe x16 expansion slot. Networking includes 1× 2.5G Ethernet. Physical design includes a 380 × 200 × 173 mm chassis (13.15L). Cooling information lists 120 mm main fan. Power information lists SFX power supply rated at 750W. Lifecycle information lists 2-year warranty.

Based on its overall score of 191.0, Corsair ONE i300 is positioned as a mainstream mini PC entry in this dataset; compare it against alternatives by CPU class, GPU type, memory ceiling, storage expansion, LAN, and port selection.

Verdict

Best for

compact gaming, GPU-accelerated creative work, heavy multitasking, VM-heavy workflows, larger multitasking setups.

Avoid if

you want a silent, ultra-low-power office box; you need multiple high-speed LAN ports for router or NAS duty; you need a truly tiny mini PC.

Alternatives

Pinova P1 — better value at comparable performance
Lenovo P3 Ultra 13900 A5500 — higher performance ceiling
GMKtec/Morefine Nucbox K11 4090M — adds OCuLink for external GPU expansion

Review

The Corsair ONE i300 is a desktop-replacement mini PC built around Intel i9 12900K and NVIDIA 3080 discrete graphics. With a listed price around $3,020, it is aimed at buyers looking for compact gaming, GPU-accelerated creative work, heavy multitasking, VM-heavy workflows, larger multitasking setups. The core spec sheet is solid for its class: up to 64GB RAM across 2 slots at 4800 MT/s, up to 2 drives, including 1 NVMe slot (1 PCIe 4.0 x4 NVMe, 2.5-inch SATA), 1×2.5GbE, and 2 USB4 40Gbps, 1 HDMI 2.1. The 191.0 overall score suggests a more specialized or entry-level role, so it should be judged by fit-for-purpose features rather than raw benchmark ambition. The main reason to pause is fit: avoid it if you want a silent, ultra-low-power office box; you need multiple high-speed LAN ports for router or NAS duty; you need a truly tiny mini PC. Overall, the Corsair ONE i300 makes the most sense when its CPU/GPU balance, port selection, and expansion profile match your workload; otherwise, compare it against similarly priced mini PCs with better networking, quieter cooling, or stronger upgrade paths.