Build Compatibility Checker

The DOA build nobody warns you about

Nothing sours a DIY build faster than a box of parts that will not POST. The single most common reason is not a defective part — it is a compatibility clash the builder did not see coming. DDR5 sticks in a DDR4 board. A 3.5-slot GPU that does not clear a front radiator. A PSU without the 12VHPWR connector a new RTX card needs. The parts are all "good," they just do not belong together.

That is the gap the Build Compatibility Checker closes. You enter your CPU, motherboard, RAM, GPU, PSU, cooler and case, and it flags the clashes before you check out. No signup, runs locally in your browser, and the verdict is plain English — not a wall of specs you have to interpret.

How the tool works

The checker cross-references five compatibility axes simultaneously:

• Socket & chipset — does the CPU fit the motherboard socket (LGA 1700, AM5, etc.) and is the chipset generation correct?
• RAM generation & speed — DDR4 vs DDR5, plus whether the kit's rated XMP/EXPO speed is realistic for the memory controller and slot population.
• GPU length vs case clearance — compares GPU physical length to the case's max GPU clearance, accounting for a front-mounted radiator eating space.
• GPU power vs PSU — checks wattage headroom and the right connector (8-pin, 6+2-pin, 12VHPWR/12V-2x6 for RTX 40/50).
• Cooler height vs case — tall air coolers (160mm+) often hit side panels or RGB RAM; the checker flags the clash.

Each axis returns a Pass, Warn, or Fail. A Fail means do not buy; a Warn means you can proceed but should verify a spec.

Step-by-step usage

1. Pick your CPU. The tool auto-detects the socket and filters motherboards accordingly.
2. Pick your motherboard. This locks the chipset and RAM generation.
3. Enter your RAM kit — capacity, speed, sticks count, DDR gen. The tool checks it against the board and the CPU's memory controller.
4. Enter your GPU and your PSU wattage and connector type. The tool pairs them and warns about under-sizing or missing connectors.
5. Enter cooler and case — CPU cooler height and case clearance, plus GPU length vs case clearance.
6. Read the verdict. Each line tells you Pass, Warn, or Fail, with the reason inline.

Common hardware problems this tool solves

• "My new DDR5 RAM will not fit my board" — DDR4 and DDR5 are not interchangeable. The notch differs and the electrical spec differs. The checker catches this on the first screen.
• "GPU fits the slot but hits my front radiator" — a 360mm front radiator can shave 50–60mm off the case's stated GPU clearance. The tool accounts for this.
• "My PSU has no 12VHPWR connector" — RTX 40/50 cards need it; adapters work but are not ideal. The tool flags the missing connector and points to the PSU Wattage Matcher for an ATX 3.0 upgrade.
• "Tall air cooler hits my RAM" — a 168mm tower cooler can overhang RGB RAM sticks. The checker warns and suggests low-profile RAM or a shorter cooler.

For deeper fault guides, browse the motherboard, CPU and GPU fix hubs.

Pro tips for DIY builders

• Buy the motherboard spec sheet, not the marketing page. The spec sheet tells you the exact socket, chipset, RAM generation, max RAM speed and clearance numbers. Marketing pages round and fudge.
• Verify GPU clearance with a front radiator installed. Case manufacturers quote clearance with no front radiator. If you mount one, subtract its thickness plus fans (~55–65mm).
• PSU tier matters as much as wattage. A no-name 850W unit is worse than a quality 650W. Stick to reputable brands and at least 80+ Gold for gaming builds.
• Plan for upgrades. Buy a PSU with 150–250W headroom and a case with GPU clearance to spare. Future-you will thank past-you.
• When in doubt, check the QVL. Motherboard vendor Qualified Vendor Lists tell you which RAM kits were tested. Off-QVL kits often work but are not guaranteed.

The five minutes you spend running the checker beats the five days you wait for an RMA. Compatibility is free to verify and expensive to ignore.