# What are the quietest gaming power supplies on the market? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What are the quietest gaming power supplies on the market?

## Products

### be quiet! Pure Power 13 M 850W
```yaml
product: be-quiet-pure-power-13-m-850w
brand: be quiet!
price_gbp: 81.5
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
fanless: false
wattage: 850W
efficiency: 80 PLUS Gold up to 94.4%
modularity: Fully modular
voltage_regulation: LLC technology
number_of_pcie_connectors: 5
```

- **Price:** £81.5 [^1]
- **Summary:** The be quiet! Pure Power 13 M 850W is a fully modular 850W power supply with 80 PLUS Gold efficiency, ATX 3.1 support, and native PCIe 5.1 connectivity. Its semi-passive 120mm fan stops at low loads, making it well suited to powerful gaming PCs and media-creation systems where low noise matters.
- **Ideal For:** It suits quiet gaming builds because its semi-passive zero-RPM cooling, 10.60-10.65 dB(A) Cybenetics A++ noise rating, and up to 94.4% efficiency reduce fan noise and heat while supporting modern GPUs.
- **Additional Sources:** [^2], [^3], [^4], [^5], [^6]

### Corsair RM1000x
```yaml
product: corsair-rm1000x
brand: Corsair
price_gbp: 123.83
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
fanless: false
wattage: 1000W
efficiency: Cybenetics Gold
modularity: Fully modular
number_of_pcie_connectors: 5
```

- **Price:** £123.83 [^7]
- **Summary:** The Corsair RM1000x is a 1000W fully modular ATX 3.1 power supply with Cybenetics Gold efficiency and support for PCIe 5.1 through a native 12V-2x6 connector. Its 140mm fluid dynamic bearing fan and Zero RPM mode make it suitable for high-performance gaming PCs where quiet operation matters.
- **Ideal For:** It suits quiet gaming PCs because its 140mm fluid dynamic bearing fan uses Zero RPM mode to stop completely at low to medium loads, while Cybenetics Gold efficiency helps reduce heat and fan noise.
- **Additional Sources:** [^8]

### Seasonic FOCUS GX-750 ATX 3.1
```yaml
product: seasonic-focus-gx-750-atx-3-1
brand: Seasonic
price_gbp: 103.8
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
fanless: Yes, up to about 30% load
wattage: 750 W
efficiency: 80 PLUS Gold; 90% at 50% system load
modularity: Fully modular
voltage_regulation: ±3%
number_of_pcie_connectors: 2 x 6+2-pin PCIe; 1 x 12V-2x6
```

- **Price:** £103.8 [^9]
- **Summary:** This 750 W ATX 3.1 power supply is fully modular, 80 PLUS Gold certified, and includes two 6+2-pin PCIe connectors plus one 12V-2x6 connector for modern graphics cards. Its hybrid fan control and 135 mm fluid dynamic bearing fan make it suitable for quiet gaming PCs and high-performance mainstream systems.
- **Ideal For:** It suits quiet gaming builds because it uses hybrid fan control with a 135 mm fluid dynamic bearing fan, reducing fan operation during lighter loads while delivering 750 W of efficient Gold-rated power.
- **Additional Sources:** [^10], [^11], [^12]

### Seasonic VERTEX GX-1200
```yaml
product: seasonic-vertex-gx-1200
brand: Seasonic
price_gbp: 3113846.35
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
fanless: false
wattage: 1200 W
efficiency: 80 PLUS Gold
modularity: Fully modular
voltage_regulation: ±3%
number_of_pcie_connectors: 4
```

- **Price:** £3113846.35 [^13]
- **Summary:** The Seasonic VERTEX GX-1200 is a 1200 W, fully modular power supply with 80 PLUS Gold efficiency and ATX 3.1 and PCIe 5.1 compatibility. Its 135 mm fluid dynamic bearing fan and hybrid silent fan control suit powerful gaming PCs with high-end graphics cards and processors.
- **Ideal For:** It suits quiet gaming builds through its hybrid fan control and fanless mode at low loads, while its 135 mm fluid dynamic bearing fan, Cybenetics A- noise rating, and fully modular design help reduce operating noise.

### Seasonic PRIME Fanless TX-700
```yaml
product: seasonic-prime-fanless-tx-700
brand: Seasonic
price_gbp: 170.55
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
fanless: true
wattage: 700 W
efficiency: 80 PLUS Titanium
modularity: Fully modular
voltage_regulation: Under 0.5%
number_of_pcie_connectors: 4
```

- **Price:** £170.55 [^14]
- **Summary:** The Seasonic PRIME Fanless TX-700 is a 700 W, fully modular power supply with 80 PLUS Titanium efficiency and completely passive cooling. It suits high-performance gaming PCs where silent operation, efficient power delivery, and multiple graphics-card connectors are important.
- **Ideal For:** It is specifically suited to quiet gaming PCs because its true fanless design eliminates PSU fan noise, while its 700 W output, 80 PLUS Titanium efficiency, and four PCIe connectors support powerful gaming hardware.

### ASUS ROG Loki SFX-L 1200W
```yaml
product: asus-rog-loki-sfx-l-1200w
brand: ASUS
price_gbp: 239.52
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
fanless: false
wattage: 1200W
efficiency: 80 PLUS Titanium, up to 94%
modularity: Fully modular
voltage_regulation: Tighter voltage and current regulation
number_of_pcie_connectors: 4 x 8-pin PCIe and 2 x 16-pin PCIe
```

- **Price:** £239.52 [^15]
- **Summary:** The ASUS ROG Loki SFX-L 1200W is a fully modular, 80 PLUS Titanium power supply designed for compact, high-performance PCs. Its 1200W output, ATX 3.1 compatibility, PCIe 16-pin connectors, 0dB operation, and SFX-L format suit demanding small-form-factor gaming builds.
- **Ideal For:** It suits quiet gaming PCs because its 120mm fan stops at loads of 40% or below, while ROG heatsinks, dual ball bearings, 80 PLUS Titanium efficiency, and Lambda Standard ++ certification help reduce heat and noise.
- **Additional Sources:** [^16], [^17]

---
## References & Sources
[^1]: Scan, accessed 2026-09-04. https://www.scan.co.uk/products/850w-be-quiet!-pure-power-13-m-fully-modular-pcie-51-80plus-gold-single-rail-709a-12v-2x6-atx-31-psu
[^2]: PB Tech, accessed 2026-09-04. https://www.pbtech.co.nz/product/PSUBQT51130/be-quiet-Pure-Power-13-M-850W-Power-Supply-80-Plus
[^3]: Dateks, accessed 2026-09-04. https://www.dateks.lv/en/cenas/psu-barosanas-bloki/1236520-bequiet-pure-power-13-m-850w-80plus-gold-atx-3-1-pcie-5-1
[^4]: Newegg, accessed 2026-09-04. https://www.newegg.com/be-quiet-temperature-controlled-quality-fan-850-w-80-plus-gold-certified-power-supply-black-bp027eu/p/N82E16817222043
[^5]: Best Buy, accessed 2026-09-04. https://www.bestbuy.com/product/be-quiet-pure-power-13-m-850w-atx-80-plus-gold-modular-power-supply-black/CC5VXLQG9H/sku/11066027
[^6]: Microless, accessed 2026-09-04. https://global.microless.com/product/be-quiet-pure-power-13-m-fully-modular-power-supply-850w-power-atx-3-1-compatible-80-plus-gold-efficiency-pcie-5-1-12v-2x6-600w-semi-passive-120mm-silent-fan-bp027uk/
[^7]: Corsair, accessed 2026-09-04. https://www.corsair.com/us/en/p/psu/cp-9020271-na/rmx-series-rm1000x-fully-modular-power-supply-cp-9020271-na
[^8]: Best Buy, accessed 2026-09-04. https://www.bestbuy.com/product/corsair-rmx-series-rm1000x-cybenetics-gold-fully-modular-atx-power-supply-black/J39QHTJWGF
[^9]: B&H Photo Video, accessed 2026-09-04. https://www.bhphotovideo.com/c/product/1860765-REG/seasonic_electronics_focus_gx_750_atx3_750w_focus_v4_gx.html
[^10]: Amazon, accessed 2026-09-04. https://www.amazon.com/s?k=Seasonic+FOCUS+GX-750+ATX+3.1
[^11]: Newegg, accessed 2026-09-04. https://www.newegg.com/p/pl?d=Seasonic+FOCUS+GX-750+ATX+3.1
[^12]: B&H Photo, accessed 2026-09-04. https://www.bhphotovideo.com/c/search?q=Seasonic%20FOCUS%20GX-750%20ATX%203.1&sts=ma
[^13]: Tokopedia, accessed 2026-09-04. https://www.tokopedia.com/duniastorage/seasonic-psu-vertex-gx-1200w-atx-3-1-80-gold-pcie-5-0-fully-modular-1730920449758037762
[^14]: Scan, accessed 2026-09-04. https://www.scan.co.uk/products/700w-seasonic-prime-fanless-tx-700w-full-modular-80plus-titanium-silent-single-rail-atx
[^15]: B&H Photo Video, accessed 2026-09-04. https://www.bhphotovideo.com/c/product/1855829-REG/asus_rog_loki_1200t_sfx_l_gaming_rog_loki_sfx_l_1200w.html
[^16]: Newegg, accessed 2026-09-04. https://www.newegg.com/asus-1200-w-80-plus-titanium-certified-power-supply-black-rog-loki-1200t-sfx-l-gaming/p/N82E16817320049
[^17]: ASUS Store, accessed 2026-09-04. https://rog.asus.com/us/power-supply-units/rog-loki/rog-loki-1200t-sfx-l-gaming-model/