How many case fans does a gaming PC need?

A solid baseline is two intake fans at the front and one exhaust at the rear, which gives good airflow with mild positive pressure. Hot GPUs, an AIO radiator or a packed case benefit from adding a third intake or a top exhaust. More fans help only up to a point — placement and clear airflow paths matter more than sheer count.

Should fans blow in or out?

Front and bottom fans are usually intakes (cool air in); rear and top fans are usually exhausts (hot air out), since heat rises and the GPU/CPU heat exits the back. Aim for slightly more intake than exhaust for positive pressure, which helps keep dust out when your intakes are filtered.

Do I need special fans for an AIO or radiator?

Radiators have dense fins that resist airflow, so static-pressure fans (or balanced fans rated for radiators) work better there than pure airflow fans. They maintain performance against that resistance where an open-air fan would stall. For ordinary case intakes and exhausts, standard airflow fans are fine.

Are RGB case fans worth it?

RGB and ARGB fans light up your build without hurting cooling — the LEDs draw negligible power and the airflow matches the non-lit version. They cost a bit more and need an RGB or ARGB header (or a controller) for the lighting. If you want a custom-lit rig, they're worth it; for pure cooling on a budget, plain fans save money.

What's the difference between PWM and DC fans?

PWM (4-pin) fans let the motherboard control speed precisely, so they can run near-silent at idle and ramp up only when needed. DC (3-pin) fans are controlled by voltage and adjust more coarsely. For the quietest, most responsive setup, choose PWM fans and connect them to PWM fan headers or a PWM hub.

How do I make my PC fans quieter?

Run larger 140mm fans at lower speeds rather than small fans at full tilt, use PWM control so they idle slowly, and set a sensible fan curve in your BIOS or fan software. Fans with fluid-dynamic or magnetic bearings tend to run quieter than basic sleeve or ball bearings. Clean dust filters regularly so fans don't have to work harder.

Will more case fans lower my temperatures?

Up to a point — going from poor to good airflow drops temperatures noticeably, but adding ever more fans gives diminishing returns and just adds noise. Once you have balanced intake and exhaust with clear airflow paths, focus on fan placement, dust filters and your CPU/GPU coolers rather than piling on more fans.

What fan size fits my case?

Most cases take 120mm and 140mm fans, but mounting points vary, so check your case's specification for how many of each size it supports and where. Radiators also dictate fan size. When in doubt, 120mm is the most universally supported size; fit 140mm where your case allows for quieter cooling.

►Specials

►Best PC Case Deals

►Computer Cases & Chassis

►

Case Fans

PC Case Fans — Airflow & Cooling 🌀

Case fans move air through your PC: cool air in, hot air out. Good airflow keeps your CPU and GPU below their throttling temperatures, so they hold higher clock speeds under load and last longer. The most common sizes are 120mm and 140mm — larger fans move more air at lower speeds, which means more cooling for less noise.

Match the fan to the job. "Airflow" fans are tuned for open space — case intakes and exhausts — and shift the most air. "Static-pressure" fans are built to force air through restrictions like radiator fins and dense dust filters, so they suit AIO and custom-loop radiators. PWM fans let the motherboard vary their speed automatically, ramping up under load and staying quiet at idle. ARGB models add addressable lighting.

Evetech stocks case fans from quiet single units to ARGB multi-packs, with local warranty and nationwide delivery. Compare sizes, airflow and lighting below, and aim for slightly more intake than exhaust for positive pressure that keeps dust out.

How to Choose Case Fans

Choosing case fans comes down to size, fan type, how they're controlled, and how many you run for the right airflow balance. Get those right and your PC runs cooler and quieter; get them wrong and you either bake the hardware or build a leaf blower. The points below cover each decision.

140mm fans have larger blades, so they move more air at lower speeds — that means more airflow for less noise where your case has room for them. 120mm fans are the most widely supported size and fit compact cases and most radiators. Check what mounts your case and radiator accept before buying, then size up to 140mm where you can.

Airflow fans are optimised for open mounting points like case intakes and exhausts, where they shift the most air. Static-pressure fans are built to push air through resistance — radiator fins, dense dust filters, restrictive front panels. Use static-pressure fans on AIO and custom-loop radiators, and airflow fans for general case ventilation. Many modern fans balance both reasonably well.

A 4-pin PWM fan lets the motherboard vary its speed precisely, ramping up under load and dropping to near-silent at idle. A 3-pin DC fan is controlled by voltage and is usually a bit coarser. For a quiet build that responds to temperature, prefer PWM fans and plug them into PWM headers or a PWM hub.

No — the lighting on RGB and ARGB fans draws very little power and doesn't meaningfully affect cooling; a good ARGB fan moves air just like its non-lit version. The trade-off is wiring: addressable fans need an ARGB header (or a controller/hub) as well as the fan power, so plan your headers. Choose on airflow first, then lighting.

Positive pressure means slightly more intake than exhaust, so air is pushed out through every gap and dust is drawn in mainly through your filtered intakes — easier to keep clean. Negative pressure pulls more air out than in, which can cool slightly better but sucks dust in through every unfiltered gap. For most builds, aim for mild positive pressure with filtered intakes.