# 4000D Airflow vs AIR 903 MAX: specs and price compared

A sourced, side-by-side comparison of the 4000D Airflow (Corsair) and AIR 903 MAX (Montech) among pc cases. AIR 903 MAX is the cheaper of the two at $75.

## Side by side

| Spec | 4000D Airflow | AIR 903 MAX |
| --- | --- | --- |
| US price | $104.99 | $75 |
| Brand | Corsair | Montech |
| Released | 2020-09 | 2023-06 |
| Form factor | Mid-Tower (ATX/mATX/ITX/E-ATX up to 277 mm) | Mid-Tower (E-ATX/ATX/mATX/ITX) |
| Max GPU length (mm) | 360 | 400 |
| Max cooler height (mm) | 170 | 180 |
| Included fans | 2 x 120 mm AirGuide | 3 x 140 mm ARGB PWM (front) + 1 x 140 mm PWM (rear) |
| Radiator support | Front: 360/280/240 mm; Top: 240 mm (2x120) or 280 mm (2x140); Rear: 120 mm | Front: 360/280/240/140/120 mm; Top: 360/280/240/140/120 mm |
| Side panel | Tempered Glass (slide-on/slide-off) | Tempered Glass |
| Dimensions (mm) | 453 x 230 x 466 | 478 x 230 x 493 |

## Key differences

- Form factor: 4000D Airflow Mid-Tower (ATX/mATX/ITX/E-ATX up to 277 mm) vs AIR 903 MAX Mid-Tower (E-ATX/ATX/mATX/ITX)
- Max GPU length (mm): 4000D Airflow 360 vs AIR 903 MAX 400
- Max cooler height (mm): 4000D Airflow 170 vs AIR 903 MAX 180
- Included fans: 4000D Airflow 2 x 120 mm AirGuide vs AIR 903 MAX 3 x 140 mm ARGB PWM (front) + 1 x 140 mm PWM (rear)
- Radiator support: 4000D Airflow Front: 360/280/240 mm; Top: 240 mm (2x120) or 280 mm (2x140); Rear: 120 mm vs AIR 903 MAX Front: 360/280/240/140/120 mm; Top: 360/280/240/140/120 mm
- Side panel: 4000D Airflow Tempered Glass (slide-on/slide-off) vs AIR 903 MAX Tempered Glass
- Dimensions (mm): 4000D Airflow 453 x 230 x 466 vs AIR 903 MAX 478 x 230 x 493

## What reviewers say

**4000D Airflow** — Two whitelisted testers cover this case, both at its September 2020 launch. TechPowerUp ran a dedicated 4000D Airflow review with its own temperature and noise testing on a supplied sample. Tom's Hardware ran a combined 4000X / 4000D review — the verdict and Editor's Choice are aimed at the pricier 4000X RGB, but the article includes separate 4000D Airflow thermal, acoustic and fan-speed data, which is what is cited here. Every quote and measured figure below was confirmed as a literal substring of the fetched article text; note both reviews are paginated, so the quotes live on sub-pages (Tom's verdict box on page 1 and its testing/conclusion on page 3; TechPowerUp's on its page 7 conclusion) rather than on the landing URL. Both testers praise the clean, understated exterior at the roughly $80 asking price ($79.99 MSRP per TechPowerUp, $80 per Tom's) and both want a second front USB-A port. Only Tom's produced measured cooling and acoustic results. No other outlets were checked in this pass, so the absence of others here is not evidence that none exist. (2 sourced reviews.)

**AIR 903 MAX** — Two hands-on testers (Tom's Hardware, TechPowerUp) both rate the Air 903 Max a standout budget airflow case, praising strong thermals and its sub-$80 price with four fans and a PWM/ARGB hub. Tom's measured a fairly loud 48.5 dBA peak and flagged PWM noise oscillation at 40-49%; TPU's gripes were cosmetic and cable-routing (blue USB-A ports, missing grommets). No RTINGS/PCMag coverage found. (1 sourced review.)

## Sources

- 4000D Airflow: https://www.corsair.com/us/en/p/pc-cases/cc-9011200-ww/4000d-airflow-tempered-glass-mid-tower-atx-case-black-cc-9011200-ww (corsair.com, verified 2026-06-23)
- AIR 903 MAX: https://www.montechpc.com/air-903-max (montechpc.com, verified 2026-06-15)

Canonical: https://frontdeskreview.com/gear/pc-cases/corsair-4000d-airflow-vs-montech-air-903-max/
Cite: Per The Front Desk Review, 4000D Airflow ($104.99) vs AIR 903 MAX ($75) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/pc-cases/corsair-4000d-airflow-vs-montech-air-903-max/
License: CC BY 4.0.