Sandwich vs traditional SFF layouts

Small-form-factor cases use two dominant internal layouts. Traditional layouts place the GPU beside the motherboard in the same chamber, similar to a shrunken ATX tower. Sandwich layouts stack the GPU behind the motherboard, often separated by a central spine, with a PCIe riser connecting the two. Each approach trades desk footprint, cooling simplicity, and build difficulty differently.

Neither layout is universally better. Traditional cases forgive more compatibility mistakes. Sandwich cases reward planning and deliver the smallest desk presence. Picking the wrong layout for your tolerance and parts list is a common source of buyer’s remorse in SFF.

Traditional layout

Cases like the Cooler Master NR200, Fractal Design Terra (GPU-in-main-chamber variants), and many tower-style ITX shells keep the GPU in the primary chamber beside the motherboard. Airflow paths are easier to reason about: front-to-back, bottom-to-top, or side-intake patterns map cleanly to fan placement.

GPU length is often generous relative to case volume. CPU tower coolers and 240 mm AIOs frequently fit without exotic routing. The trade-off is a larger footprint on your desk and sometimes a taller or wider outer box than a sandwich of similar internal volume.

• Best for first-time SFF builders and wide GPU compatibility.
• More aftermarket air coolers and AIO sizes typically fit.
• Larger outer dimensions; less “showpiece” density on the desk.
• Thermals are usually easier to tune with stock fan curves.

Sandwich layout

Sandwich cases like the Formd T1, Loque Ghost, and other premium SFF designs put the GPU in a separate chamber behind the board. A PCIe riser carries the signal; quality risers matter. You gain a tiny footprint and striking proportions, but CPU and GPU heat can interact through the central spine or shared exhaust paths.

Undervolting, custom fan curves, and mesh panels become part of the build plan, not optional tweaks. CPU cooler height limits are strict. Cable routing order matters: CPU power and front-panel leads often must be connected before the GPU chamber is closed.

• Smallest desk footprint for a given component class.
• Strict CPU cooler height and riser quality requirements.
• Plan exhaust paths and fan directions before ordering parts.
• Expect more iteration during first assembly.

Cooling comparison

Traditional towers can often run a mid-tier air cooler and a long GPU with minimal tuning. Sandwich cases may require a low-profile cooler or AIO on the CPU side while the GPU breathes through mesh side panels. If you chase silence, traditional layouts usually reach lower fan speeds for the same hardware.

High-power CPUs plus high-power GPUs in a sandwich case are achievable, but assume you will spend time on thermal testing. Builders who want plug-and-play behavior should bias toward traditional layouts.

How to choose

Choose traditional if desk size is flexible, you want maximum compatibility, or this is your first compact build. Choose sandwich if minimum footprint is the top priority and you are willing to tune thermals and cable routing.

Load representative cases from each layout in Case Lab and compare outer boxes. A sandwich case may be half the volume of a traditional tower while fitting the same GPU class, but only if your cooler and riser choices align with that case’s constraints.

• Budget and ease: NR200-class traditional towers.
• Showpiece and minimum volume: T1-class sandwiches.
• Strong GPU airflow without sandwich complexity: mesh ITX towers like the Meshlicious.

Next steps

Put what you learned into practice in the Case Lab, browse the ITX case directory, or ask the Community.

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