BEFORE YOU BUY · PC cases
Choosing a PC case that fits your whole build
Use an eight-part worksheet to check motherboard, GPU, cooling and power-supply fit before choosing a PC case.
Research-based buying guidance. We explain what to check; we have not tested the products in this guide.
Record the parts you need to fit
Start with the equipment you already own and any parts you intend to keep. Write down exact model numbers, including the case revision. Similar names and photographs can hide different mounting layouts or included fans.
Decide where the computer will sit, too. Measure the available space and leave access for the ports, panels and cables you expect to use. A case that accommodates the parts can still be inconvenient on your desk or in a cabinet.
Use the worksheet below before choosing a finish or lighting scheme. Add a link or manual page beside each requirement so you can check it again when another part changes.
| Part or space | Record before choosing | Check against the exact case |
|---|---|---|
| Motherboard | Format, dimensions and connector layout | Supported formats, mounting diagram and any restrictions for rear connectors |
| Graphics card | Length, width, thickness, power connector position and quantity | Usable room in the intended layout, adjacent slots and cable routing |
| Tower CPU cooler | Installed height and the manufacturer's memory-clearance instructions | Cooler-height limit and the assembled position of the fan |
| Liquid cooler | Radiator dimensions, fan thickness and intended position | Supported mounting position and combined assembly clearance |
| Power supply | Format, body length and cable connections | PSU compartment and space needed for plugs and cable routing |
| Drives | Form factor and number of devices | Documented drive mounts; motherboard-mounted drives are a separate check |
| Fans | Included fans, pack contents and intended positions | Available mounts after accounting for the radiator and existing fans |
| Front ports | Connections you want to use | Case ports and the corresponding connections in the motherboard manual |
Mark unresolved checks as unknown. That is more useful than assuming an omitted specification means unlimited space.
Compare exact dimensions without claiming complete fit
For one real specification example, NZXT lists up to 410 mm GPU length for the H5 Flow, model CC-H52FB-01 in black. Gigabyte lists its GV-R9070XTGAMING OC-16GD at 288 × 132 × 56 mm. The GPU's documented length is below that case reference limit. This comparison does not establish room for the power cables, adjacent cards or your chosen front cooling assembly. NZXT H5 Flow specifications, Gigabyte card specifications.
Keep the manufacturer's dimension labels alongside the numbers. A card's longest dimension and its thickness answer different questions. Record the intended orientation and mounting arrangement before deciding that two measurements are comparable.
If you plan to use two graphics cards, check each installed position and the motherboard's electrical lane configuration. Available case slots alone do not establish that the hardware fits or that your workload supports multiple GPUs.
Choose a radiator position before counting fans
NZXT's H5 Flow documentation distinguishes front and top radiator support: up to 360 mm at the front and 240 mm at the top, with a conditional 280 mm top option for low-profile memory. It also specifies a 55 mm combined top radiator-and-fan thickness limit. Those conditions belong with the size labels when comparing coolers. NZXT mounting specifications.
Consider a fictional layout with a documented 50 mm assembly limit. A proposed radiator is 30 mm thick and its fans are 25 mm thick, making the assembly 55 mm before considering other installation details. It exceeds that stated limit even if the advertised radiator size appears supported. Move to a documented alternative position or choose a different assembly; do not assume the side panel or motherboard will make room.
Draw a simple position list: front, top, rear and any other documented mounts. Assign each existing fan and radiator assembly to a position before adding more fans to the shopping list. A fan included with a radiator is also an installed fan; buying it does not create another mounting position.
Use the builder to organize the check
Nerdy Deals can keep selected parts and quantities together in a saved build. Use its compatibility notes to identify which details need manufacturer verification, then add your resolved dimensions to the worksheet.
The 3D view shows a representative assembly. It helps you inspect the selected part areas, but it does not measure your exact case interior or certify clearance. Likewise, having every required part selected does not prove physical compatibility.
Save or copy the build link after changing a part. Recheck the requirements that change with it: a thicker GPU, taller memory, another drive or a different cooler can alter your layout even when the case stays the same.
Decide whether a new case solves your problem
If your existing case meets the documented fit and access requirements, keeping it is a reasonable option. State the problem a replacement would solve before comparing appearance or extras. Do not infer lower temperatures or quieter operation from the case photograph or fan count.
Before ordering, you should be able to describe the exact motherboard, GPU arrangement, cooler position and PSU installation you intend to use, with the unresolved checks clearly listed. Verify the current manual and ask the manufacturer about any remaining physical conflicts.
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