PC build under $400
A complete everyday PC for the US: study, office work, video and eSports games on built-in graphics. Every part fits with the others: socket, memory, case and power supply are checked for you.
Parts list
- Processor
Intel Processor 300 Est. $80 Buy now on Amazon - Motherboard
ASUS PRIME H610M-K D4 ARGB Est. $105 Buy now on Amazon - Memory
Dell SNPK67DJC/4GB 4 GB DDR4 Memory Est. $45 Buy now on Amazon - Storage
Acer SA100 480 GB SSD Est. $70 Buy now on Amazon - Power supply
Chieftec EON ZPU-400S 400W Power Supply Est. $50 Buy now on Amazon - Cabinet
Chieftec AS-02B-OP Mid-Tower Case Est. $50 Buy now on Amazon - CPU cooler Not needed: use the cooler in the CPU box
No graphics card at this budget: the CPU’s built-in graphics run eSports, and you can add a card later.
What it runs
Built-in graphics handle study, office work, video and lighter games such as Valorant, CS2 and Fortnite at 1080p low or 720p. For new AAA games, add a graphics card later: the power supply here leaves room for an entry-level card.
Why these parts
- Intel Processor 300: it has graphics built in, so the PC works without a card.
- 4 GB memory: one stick for now; add a matching one later.
- 480 GB SSD: Windows and games load in seconds.
Buying & Building Advice for the United States
Retailers, Bundles & Return Windows
Look for CPU/Motherboard combo bundles if you live near a Micro Center. For Amazon and Newegg orders, confirm items are "Sold and Shipped by" verified retailers for standard 30-day returns and authentic manufacturer warranty protection.
Power Efficiency & Headroom
This power supply configuration provides 25%–35% headroom above peak system draw. The 80 PLUS certification ensures high efficiency on 115V AC domestic circuits while maintaining quiet fan curves under full load.
Recommended Monitor Pairing
Designed for fluid 1080p gaming: match with an affordable 24-inch 1080p 144Hz+ gaming display for competitive esports titles.
Future Upgrade Path
Chassis clearances, power supply wattage, and motherboard expansion lanes leave a clear path to slot in a faster GPU or add secondary M.2 NVMe storage.
Want a graphics card? The cheapest gaming PC today
At $400 the list above has no room for a graphics card at today's prices; its built-in graphics run esports games, and a card is the easiest upgrade later. The cheapest complete PC with a graphics card comes to about $695:
-
Processor AMD Ryzen 5 5600X $115 -
Graphics card AMD Radeon RX 6500 XT 4GB $200 -
Motherboard ASUS Prime B550M-A (mATX) $90 -
Memory Dell A9321912-OEM 16 GB DDR4 Memory $105 -
Storage Verbatim Vi3000 PCIe NVMe M.2 SSD 256GB $85 - Power supply Chieftec EON ZPU-400S 400W Power Supply $50
- Cabinet Chieftec AS-02B-OP Mid-Tower Case $50
Other budgets
- Under $400
- Under $500
- Under $600
- Under $700
- Under $800
- Under $1,000
- Under $1,200
- Under $1,500
- Under $2,000
- Under $2,500
- Under $3,000
PC build under $400: questions
Can you build a good PC under $400 today?
Yes, for study, office work and lighter games. At about $400 there is no money for a graphics card yet, so the Intel Processor 300's built-in graphics do the work. A card is the easiest upgrade later.
Are these the final prices?
No. They are estimates from recent store listings and exchange rates (updated 2026-10-30), not live prices. Prices change every day and differ by shop and city, so press a store button to see today's price before you buy.
Can I change a part?
Yes. "Customize this build" opens the whole list in our PC builder, where you can swap any part. It checks that the socket, memory type, case size and power supply still fit.
Is 4 GB of RAM enough?
For now, yes for study, browsing and eSports. Memory costs a lot right now, so this build starts with one stick; add a second matching stick later for 16 GB and smoother multitasking.
Does the price include a monitor, keyboard and Windows?
No. It covers the PC itself: processor, motherboard, memory, storage, power supply, cabinet and, where the budget allows, the graphics card and cooler. Budget extra for a monitor, keyboard, mouse and a Windows licence.
Is it cheaper than a prebuilt PC?
Usually, and you know exactly which parts you get. Prebuilt PCs at the same price often save money on the power supply, motherboard or memory speed. Building it yourself takes a couple of hours; our step-by-step guide shows how.
Building it yourself? Follow how to build a PC, step by step. Close by: PC build under $500.
Estimated prices. These are our estimates, not Amazon or eBay prices: they come from recent listings and exchange rates (updated 2026-10-30) and real prices change with the market. Press a store button to see today's price before you buy.
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