NZXT C1000 Gold ATX 3.1 Fully Modular 1000W Low-Noise PSU (ATX 3.1, 12V-2x6)

The essentials

If you’re building a high-end gaming PC, the power supply is the part you don’t want to think about twice. The NZXT C1000 Gold ATX 3.1 is a fully modular, low-noise 1000W unit designed around ATX 3.1 and the 12V-2x6 connector—an approach meant to support modern, power-hungry components with stable delivery and good efficiency. It’s also tuned for everyday comfort: the fan is built to stay quiet with Zero Fan Mode when load is lighter.

On paper, this isn’t a “bare minimum” PSU. It’s aimed at people who care about both performance standards (ATX 3.1 compliance) and noise experience. That said, it’s still only as good as your overall build requirements—if your system doesn’t actually need 1000W, you may be paying for headroom you won’t use.

Key features that matter in real builds

The biggest reason to look at this model is the ATX 3.1 focus. ATX 3.1 is intended to better align power delivery with newer high-performance PC components, especially when your GPU demands sudden bursts. The listing also highlights 80 Plus Gold efficiency, which generally helps keep power conversion losses down compared to lower-efficiency tiers.

Another differentiator is the 12V-2x6 connector (described as supporting up to 600W to NVIDIA GeForce RTX 40 Series). If you’re assembling around that class of GPU, having the right connector type matters more than most people expect—because it’s about reducing “adapter clutter” and matching the power path the platform expects.

Then there’s the noise behavior. NZXT calls out an ultra-low-noise 135 mm dynamic bearing fan plus Zero Fan Mode. The detail you’ll care about: it’s described as completely silent when under 50% load, which is where many gaming PCs spend a lot of time depending on the titles, settings, and resolution you play.

What you’ll notice day to day (and where it can fall short)

For many buyers, the day-to-day difference is noise first. If your workload stays below the stated threshold most of the time, the fan staying off can make the PC feel calmer, especially in quiet rooms. The fully modular design also helps with cable management—less unused cabling inside the case tends to keep airflow cleaner and makes future upgrades less annoying.

However, keep expectations realistic: Zero Fan Mode only applies under lighter loads. If you’re running sustained heavy rendering or GPU-heavy workloads, the fan will eventually spin, and your noise experience will depend on the rest of the cooling setup.

Also, this is a 1000W unit. If you’re building a simpler system, you might be better served by a lower-wattage option unless you specifically want the extra margin.

Tech specs at a glance

• ATX version: ATX 3.1
• Wattage class: 1000W
• Efficiency rating: 80 Plus Gold
• Modularity: Fully modular
• GPU connector: 12V-2x6 (listed support for NVIDIA GeForce RTX 40 Series)
• Fan behavior: Zero Fan Mode (silent under 50% load)
• Fan size: 135 mm dynamic bearing fan
• Capacitors: 100% Japanese capacitors
• Color: Black

Who it’s for (and who should skip it)

It makes sense if you’re trying to build a modern, performance-focused gaming PC and you want a PSU that’s aligned with ATX 3.1 and the 12V-2x6 connector approach. It also suits buyers who care about noise during lighter gaming or desktop use—because “silent under 50% load” is exactly the kind of promise you’ll actually feel.

It might not be for you if you’re putting together a lower-power build where 1000W is likely overkill. It may also be a less compelling choice if your priority is cost over standards compliance and low-noise behavior.

Practical setup tips before you buy

Before committing, double-check your GPU power path in the context of your case build. The listing’s emphasis on 12V-2x6 for RTX 40 Series means you’ll want to ensure your motherboard/GPU setup matches what you’re planning to connect.

Also consider cable routing needs. Fully modular is great, but it still pays to plan where each cable goes so you’re not fighting tight bends or airflow-blocking runs—especially in smaller cases.

And one more thing to keep in mind: fan silence under lighter loads is helpful, but your real noise experience will still depend on overall airflow (case fans, CPU cooler, and how hot your GPU runs in your specific games).

Is it worth it?

Worth buying if your build targets modern high-performance PC components, you prefer a fully modular layout, and you specifically want the PSU to stay quiet during lighter loads thanks to Zero Fan Mode. The ATX 3.1 focus and the 12V-2x6 connector approach are the kinds of details that can make life easier when you’re not interested in guesswork.

Better avoided if you’re building something that doesn’t need 1000W or if you’d rather spend less and accept a more basic feature set. It’s a solid “capable and quieter under light load” PSU on paper, but it won’t magically fix a mismatched power requirement or a poorly planned build.

Quick FAQ

Does this PSU support ATX 3.1?

Yes. It’s listed as an ATX 3.1 unit, intended for modern high-performance PC power needs.

Is it actually quiet?

The listing says it stays completely silent under 50% load thanks to Zero Fan Mode, using a 135 mm dynamic bearing fan.

Is it fully modular?

Yes, it’s described as fully modular, which helps with cable management.

What connector does it use for GPUs?

It uses a 12V-2x6 connector, with the listing mentioning support for NVIDIA GeForce RTX 40 Series up to 600W to the cards.

Are the capacitors Japanese?

Yes, the listing states 100% Japanese capacitors.