For the full breakdown, see our best Gaming PC Under $400 guide.
One used graphics card is the difference between a $400 tower that posts and a stack of parts that doesn’t. For anyone figuring out how to build a gaming PC for under $400 in 2026, that trade reshapes the whole shopping list: every dollar saved on graphics has to come out of something else, and it usually comes from the power supply or the boot drive — the two components a cheap build can least afford to lose.
The table below splits the budget by component, and the step order after it shows which parts to buy first.
Is A New-Parts $400 Gaming PC Realistic In 2026?
Integrated graphics are the reason the budget math changed.
What $400 still buys is a named dedicated GPU and an SSD, enough for esports and optimized games at 1080p with reduced settings. Here’s how the money divides:
| Component | Target Spend | What To Buy |
|---|---|---|
| Graphics card | $110–$170 | Used RX 6600 or RX 6700 from a seller with returns |
| CPU | $70–$110 | Ryzen 5 5600, or a 5600G if you skip the card |
| Memory | $25–$45 | 16GB DDR4 kit |
| SSD | $25–$45 | 240GB–500GB NVMe |
| Motherboard | $55–$85 | AM4 board |
| Power supply | $35–$55 | 450–500W, 80+ Bronze or better |
| Case | $30–$50 | Mid-tower with room for airflow |
The ranges overlap because no build hits every ceiling at once — a card at the low end of its band frees money for everything else.
Building A $400 Gaming PC: The Step Order That Works
Choosing used parts or an APU before you shop is what keeps the total under $400, and the graphics decision drives every part that follows.
- Pick the strategy first. All-new parts don’t reach $400 in 2026. Used parts or an APU build do. Settle that before you open a single listing.
- Put 35–45% of the tower budget into graphics. At $400, that means $110–$170. A used RX 6600 or RX 6700 from a seller with a return window usually lands in that band.
- Stay on AM4 and DDR4. DDR4 costs less than DDR5, and a Ryzen 5 5600 on an AM4 board is the cheapest way to six capable cores.
- Buy an SSD, never an HDD-only boot drive. A 240–500GB NVMe drive holds Windows plus a few esports titles.
- Don’t cheap out on the power supply. A 450–500W