Best Mini-ITX case 2026: NR200P, Fractal Terra or Lian Li A4-H2O?

You are looking for the best Mini-ITX case of 2026 and three names come up everywhere: Cooler Master NR200P, Fractal Design Terra and Lian Li A4-H2O. This is not a lab podium. It is a DropReference catalog shortlist: four EAN pages, the clearances the manufacturers publish, and the USD price on 4 October 2026 — converted from the euro offers at the ECB euro reference rate of 2 October 2026, 1 EUR = 1.1225 USD, rounded to the nearest dollar. The ECB does not publish a fixing on Sunday 4 October 2026 — or no offer, when there isn’t one.

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An SFF case in 2026 is judged first by what does not fit. A Mini-ITX motherboard (17 × 17 cm), an SFX or SFX-L power supply, GPU length, tower-cooler height, and the real thickness of an AIO (radiator plus fans). Litres do not tell you whether a triple-slot card goes in.

• GPU: max length, thickness (slots) and power connector. An official “322 mm” shrinks as soon as a 120 mm radiator shares the chamber.
• CPU: a big tower cooler, or a low-profile, or an AIO. On the Terra and the A4-H2O those choices collide.
• Airflow: mesh and a path for fresh air, not just “small so it must be hot”. Tempered glass or closed aluminium change noise and dust.
• Build: removable panels (NR200P) versus a sandwich layout plus riser (A4-H2O, Terra). The riser has a PCIe generation: the BIOS has to follow.

Mainstream roundups often mix the NR200P (this page), the NR200P V2 and the NR200P Max (280 mm AIO plus a power supply already in the box, a different bill). Here we mean the catalog NR200P White, not the Max bundle.

The Cooler Master NR200P ITX ARGB White (EAN 4719512106754) is still the “large” SFF case on this shortlist. Cooler Master lists 18.25 L excluding protrusions, a GPU up to 330 mm (156 mm tall, triple slot), a tower cooler of 155 mm with the steel mesh panel (153 mm under glass) and a radiator up to 280 mm on the side. Two SickleFlow 120 mm fans are preinstalled on top. Both side panels — mesh and tempered glass — are in the box.

This is the pick when you still want real air cooling, or a 240/280 AIO, without going sandwich. The PCIe 3.0 riser is included for a vertical GPU: Cooler Master asks you to force the slot to PCIe 3.0 in the BIOS if the motherboard is on 4.0. The side 280 mm is not compatible with a vertical GPU. A bottom 240 mm only makes sense with a thin GPU, or one already mounted vertically.

On 4 October 2026 the page has no offer in stock. We are not inventing a price “around $110”: as long as the comparison is empty, the NR200P White is a target, not today’s purchase. The page flags RGB; we do not detail a lighting kit beyond that flag and the two stock fans.

The NR200P vs Terra duel is not “which one cools 4 °C better”. We did not measure that. It is a trade-off of volume and parts.

The Fractal Design Terra Silver (EAN 0843276103996) and the Terra Graphite (EAN 0843276103989) are the same chassis: 10.4 L, 343 × 153 × 218 mm, anodized aluminium, an FSC walnut strip, a GPU up to 322 mm, an SFX / SFX-L PSU of 130 mm max, a PCIe 4.0 riser. Fractal says it plainly: if the GPU and the motherboard are PCIe 5.0, you have to lock the slot to 4.0 in the BIOS.

The central spine slides across seven positions. Position 1: a tower cooler up to 77 mm but a GPU about 43 mm thick (33 mm if the card is taller than 131 mm). Position 7: a GPU up to 72 mm and a cooler limited to 48 mm. A 120 mm radiator is only planned with a GPU of at most 200 mm. The DropReference page sums that up as “120 mm radiator” and “solid panel”: no 240, no glass window.

On price, only the Silver is tracked on 4 October 2026: $238 for the lowest new offer (212 €), then $239 (213 €), $242 (216 €) and an outlier at $480 (428 €). The Graphite has no offer. Same case, not the same purchase today. We are not copying a “historical” Graphite price. Dollars use the ECB euro reference rate of 2 October 2026, 1 EUR = 1.1225 USD, rounded to the nearest dollar. The ECB does not publish a fixing on Sunday 4 October 2026.

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The Lian Li A4-H2O Mini-ITX Airflow Black (EAN 4718466022691) is the 2026 SFF case on this shortlist when you want to stay near the Terra in volume (11 L, 326 × 140 × 244 mm) without giving up a 240 mm AIO. Sandwich layout, DAN Cases collaboration: motherboard on one side, GPU on the other, radiator on top.

Lian Li lists a GPU up to 322 mm in triple slot, a tower cooler of 55 mm max, and a 240 mm whose radiator-plus-fans stack does not exceed 55 mm. Two 120 mm mounts on top, a single 2.5" bay, SFX or SFX-L PSU, aluminium shell, mesh panels. The DropReference page lines up a 322 mm GPU, a 240 mm radiator and a mesh panel.

The riser is included. Current revisions on Lian Li’s site (A4-H2O X5 / A5) are PCIe 5.0; the first batches were 3.0 or 4.0. On the box, check the generation, then set the BIOS to match — the same reflex as on the Terra or the NR200P. The AIO’s CPU block also has to stay under 55 mm.

Today’s price: $173 as the lowest new offer (154 €), then $184 (164 €), $190 (169 €, −8%), $199 (177 €), $201 (179 €) and $218 (194 €). It is the cheapest and available page on the shortlist on 4 October 2026. That does not make it a thermal winner: it makes it the simplest buy if your build is already a slim 240 AIO and a GPU ≤ 322 mm. Same ECB conversion as above.

The scores on the cards are a buying read (space, stated headroom, today’s price). They are not measured temperatures. Nobody here “won” a 9800X3D test.

• You want a ~150 mm tower or a 280 mm and you accept 18 L on the desk: NR200P White. Wait for an offer. Do not grab a Max “to do the same thing” without comparing what is in the box.
• The desk is tiny and the walnut look matters: Terra Silver at $238 (212 €). Measure the GPU’s thickness before you pick the spine position. The Graphite: same plan, zero offers today.
• You are already on a slim 240 AIO and a GPU ≤ 322 mm: A4-H2O Black from $173 (154 €). It is the only one of the four that ticks compact + 240 mm + stock in this snapshot.
• Your card is over 330 mm, or you want a 360 mm: leave this shortlist. An 11 L Mini-ITX does not become an ATX because the generation is 2026.

Checklist before you pay: GPU length and thickness, tower-cooler height or total AIO thickness, SFX PSU length (130 mm on the NR200P and the Terra), number of 2.5" SSDs, and riser generation. Once it is built, continue with optimizing your PC’s airflow and fan placement. For the format in the broad sense (not only SFF), the 2026 gaming PC case guide sets the scene.

Mini-ITX or Micro-ATX?

A Mini-ITX board is 17 × 17 cm. Micro-ATX is around 24 × 24 cm and fits none of the four EANs above (the NR200P also accepts Mini-DTX, not a classic mATX). Fewer slots, and an SFX PSU that is often pricier than an ATX.

NR200P, V2 or Max: is it the same case?

No. This page covers the NR200P White (MCB-NR200P-WGNN-S00 on Cooler Master’s side, EAN 4719512106754). The V2 is another generation. The Max usually adds a 280 mm AIO and a power supply: another price, another comparison. Articles that price an “NR200P” at €350 (about $393 at the same ECB rate) are usually talking about the Max.

Will a large 2026 GPU fit?

Up to 330 mm in the NR200P, 322 mm in the Terra and the A4-H2O — if thickness and the CPU cooler leave the room. On the Terra, 322 mm and a tall tower cooler do not coexist. Aim for cards the GPU maker calls SFF when they say so, and measure yours.

Which watercooling?

NR200P: 240 or 280 mm on the side, with conditions (not at the same time as a vertical GPU). A4-H2O: 240 mm on top, 55 mm total thickness max. Terra: 120 mm only, and the GPU drops to 200 mm. A 360 mm is the subject of none of these four.

Is it louder?

Not automatically. A well-meshed 18 L with a big tower cooler can spin slower than a 10 L that pins a low-profile at full speed. We are not publishing a dB measurement here. Mesh (NR200P, A4-H2O) gives more air surface than the Terra’s solid sides.

Will the prices move?

Yes. $238, $173 and the two stock-outs are the 4 October 2026 snapshot on the DropReference pages, converted from 212 €, 154 € and two empty listings at the ECB euro reference rate of 2 October 2026, 1 EUR = 1.1225 USD, rounded to the nearest dollar. The ECB does not publish a fixing on Sunday 4 October 2026. Reopen the EAN on the day you buy. Shipping is not uniform from one merchant to the next.