Thermaltake Tower 300 (mATX)
The Tower 300 is a vertical octagonal showcase case for mATX and ITX boards, with generous internals — up to a 400mm GPU, 210mm cooler height and a 420mm radiator on the right side — plus an optional LCD kit, earning an enthusiast-tier 72. It's made for builders who want a display-piece chassis with serious cooling room. Skip it if you run full ATX or are tight on desk space.
Scores
BreakdownHideOverall71±3Caliber-forward blend — tier caliber + within-tier price rank 30%, value 25%, confidence 20%, compatibility 15%, upgrade path 10% — renormalized over applicable dimensions.
Scores
BreakdownHideCaliber-forward blend — tier caliber + within-tier price rank 30%, value 25%, confidence 20%, compatibility 15%, upgrade path 10% — renormalized over applicable dimensions.
The ± band on the overall score reflects sourcing confidence — wider when fewer specs are verified.
How each score is computed: our scoring methodology.
Specifications
| Spec | Value | Verification |
|---|---|---|
| form factor support | Micro-ATX, itxSourced | Sourced |
| max GPU length (mm) | 400Sourced | Sourced |
| max cooler height (mm) | 210Sourced | Sourced |
| radiator support | right side up to 420mm (120/240/280/360/420)Sourced | Sourced |
| radiator support (mm) | 120, 240, 280, 360, 420Sourced | Sourced |
5/5 detail specs sourced. Amber rows are flagged for verification — we show them as reported, not confirmed.
Verdict
Best for
- Vertical octagonal showcase tower with 420mm radiator room and optional LCD kit
Who should skip this
- Full ATX boards; desk-space-constrained setups
Known limitations
- GPU limited to 280mm with the PSU cover installed (400mm without)
Where to buy
List price $150
Prices are a guide and can change — confirm the current price on the retailer's site before buying.
Prices last checked Jun 14, 2026 — retailer prices change often, so click through for the current price.
Some links may be affiliate links — we may earn a commission at no extra cost to you; rankings are never influenced by it.
Standards
Form factors & standards — interchangeable across compatible builds, not a platform lock-in.
Compatibility
Built around Mini-ITX, Micro-ATX. Make sure the rest of your build uses the same platform before you buy — mismatched sockets, mounts or standards are the most common return reason. Check it in the builder →
Upgrade path
Outgrow it and the Fractal Design Torrent is the natural next step up in cases. See it →