What the builder checks
Pick components from the dropdowns or load a template. The builder live-calculates your total price (median 2026 market prices) and your watt need. On top, five compatibility checks run with status LEDs (green / yellow / red):
- Socket match: CPU and motherboard need the same socket (AM5, AM4, LGA1700, LGA1851)
- RAM type match: DDR4 vs DDR5 — newer platforms need DDR5, older AM4 still uses DDR4
- PSU headroom: the PSU should have at least 30% reserve over the calculated watt need (efficiency, peak loads)
- GPU length vs. case: long cards (some RTX models hit 360 mm) against the case limit. Warning if tight, error if too long
- CPU cooler height vs. case: tower coolers (e.g. Noctua D15 at 165 mm) against the case limit. Warning if tight
On top, a smart filter in the dropdown: pick a CPU and incompatible motherboards and RAM types disappear from the list automatically — you can't even click the wrong combo. Pick a small case and over-long GPUs and over-tall tower coolers drop out too.
The list at the bottom is a ready-made shopping list with Amazon links per component. If you buy through them I get a small commission from Amazon — the price stays the same for you.
What the builder does NOT check
- BIOS version: newer CPUs on older boards often need a BIOS update before they boot — not detectable here
- RAM speed QVL: a DDR5 kit at 6400 MT/s is stable on some boards, not on others — manufacturer compat lists are the truth. (Note: at DDR5 below 6000 MT/s you'll see a warning)
- M.2 slots / SATA count: if you want to install 3 NVMe SSDs, check the motherboard datasheet manually
- Front connector compatibility: USB-C header, ARGB header etc. — especially old boards + new cases, check manually
- Onboard WLAN/Bluetooth: not every motherboard has it; check separately if needed
Verify these manually before buying — most manufacturer pages have official QVL and compatibility lists.