Corsair
4000D Airflow
$104.99
Released 2020-09
Best PC Cases · head-to-head
4000D Airflow vs AIR 903 MAX
A sourced, side-by-side comparison. AIR 903 MAX is cheaper at $75. Every spec and price links to its source.
Montech
AIR 903 MAX
$75Cheaper
Released 2023-06
Which is better: the 4000D Airflow or AIR 903 MAX?
On the specs we track, they're closely matched. The AIR 903 MAX is the cheaper at $75.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| 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 |
| Release | 2020-09 | 2023-06 |
Sources — 4000D Airflow: corsair.com (verified 2026-06-23). AIR 903 MAX: montechpc.com (verified 2026-06-15).
What's the difference between the 4000D Airflow and AIR 903 MAX?
Where the two actually differ on the specs we track (7 of 7). Matching specs are omitted.
- 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
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
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, 2 lab-tested.)
Praised: Clean, understated minimalist exterior with a solid feel for the roughly $80 asking price; Good value against competitors — Tom's calls the small Corsair premium well worth it, TechPowerUp calls it a beautiful and capable case for the price; Practical build details that ease assembly and cable routing (side panels that unhook and swing out, Velcro cable channel, plentiful zip-tie anchors).
Flagged: Only one front USB-A port; both testers wanted a second USB 3.0; Heavily tinted glass side panel hides non-RGB hardware — TechPowerUp calls the tint too heavy, Tom's notes it as a deliberate trade-off it is willing to accept; Liquid-cooling constraints — TechPowerUp says support is not as vast as other ATX cases; Tom's warns thick front radiators won't clear the PSU shroud cutout and the top is limited to 280 mm.
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, 1 lab-tested.)
Praised: Strong thermal/airflow performance for the price; Sub-$80 value with four included 140mm fans plus a PWM/ARGB hub; Broad hardware support (E-ATX boards, long GPUs, up to 6-7 drives, 360mm radiators).
Flagged: Fairly loud 48.5 dBA peak plus PWM noise oscillation at 40-49%; Cable-management gaps: missing grommets, hard to hide wires with air coolers; Cosmetic/quality nits: blue USB-A ports, non-unified front-panel header.