4K Gaming PC Build 2026: Cost, Parts, FPS

See our review methodology.

A 4K gaming PC built from the r/buildapc consensus parts in October 2026 pairs a Ryzen 7 9850X3D with an RTX 5080 16GB. Per Gamers Nexus' RTX 5080 review, that card averages 112 fps in Final Fantasy XIV: Dawntrail at 4K Maximum and 58 fps in Black Myth: Wukong at 4K High, so the heaviest games at 4K still lean on DLSS. It is also the tier where 2026's memory prices matter least, since 32 GB DDR5 kits at $429–$499.99 (Tech Insider) are a smaller share of a build led by a four-figure GPU. The live total for all eight parts follows.

Build cost, October 6, 2026: at Amazon prices read in the last 24 hours, the 4K build totals $3406.84 for 8 parts. Each part is priced and linked in the tables below; prices may vary.

This page is the 4K tier of the Reddit-consensus gaming PC build, on its own URL so the parts, the total and the frame rates for one resolution sit in one place. The 1080p build and the 1440p build follow the same format. To swap a part and re-price the whole list, open the PC Builder.

The 4K parts list

Each row is one part, with its Amazon price when one was read in the last 24 hours and its own buy button. The total above adds only those prices.

4K build: Ryzen 7 9850X3D + RTX 5080

Amazon prices in the parts table and the build total are read from Amazon.com listings within the last 24 hours and change often; a part with no current price shows no price.

What 4K costs in frame rate: RTX 5080 vs RTX 5070 Ti vs RX 9070 XT

At 4K the GPU sets the frame rate in nearly every game, so the GPU choice is the decision. All rows below are Gamers Nexus measurements: the RTX 5080 review, the RTX 5070 Ti review and the RX 9070 XT review.

Average fps. Sources: Gamers Nexus RTX 5080, Gamers Nexus RTX 5070 Ti, Gamers Nexus RX 9070 XT; "—" means no matching row.

The RTX 5080 leads every shared test, by 15% in Final Fantasy XIV (112 vs 97) and 37% in Resident Evil 4 (147 vs 107) over the RTX 5070 Ti. Black Myth: Wukong shows the 4K ceiling: no card here reaches 60 fps at native 4K High. In the heaviest games, a 4K build means 4K output with DLSS or FSR upscaling, and that holds at this tier too. If your 4K games are lighter (esports, older titles), the RTX 5070 Ti is the swap that keeps every row above 50 fps for less money. Price both totals in the PC Builder.

Why each part

CPU — Ryzen 7 9850X3D. The consensus CPU is the Ryzen 7 9800X3D, which tops the CPU-bound charts in TechSpot's review. The 9850X3D is the same design clocked higher, 5.6 GHz against 5.2 GHz at the same 120 W TDP. Club386 measured it 2–3% ahead in most games (100 vs 98 fps in Cyberpunk 2077). At 4K the GPU limits most games anyway, so either chip is right. Buy whichever has a current price and costs less on the day; they drop into the same board.

Cooler — Thermalright Peerless Assassin 120 SE. X3D chips ship without a cooler, and a dual-tower air cooler is the consensus default for a 120 W part.

GPU — RTX 5080 16GB. It leads the 4K table above. Its price is the reason the RTX 5070 Ti remains the consensus card for "high-refresh 1440p or 4K". Tom's Hardware's tracker listed the 5070 Ti's best U.S. price at $1,119 against a $749 MSRP on September 28, 2026 (Tom's Hardware). Compare the live price of both cards before deciding.

Motherboard — MSI B650 Gaming Plus WiFi. B650 supports the X3D chips and DDR5-6000 EXPO. A single-GPU build does not need X670E's extra lanes.

Memory — 32 GB DDR5-6000 CL30. This is still the consensus spec. Per Tech Insider, the price rise came from memory makers moving capacity to HBM for AI accelerators. At this tier it is a smaller share of the total than in the 1080p build.

Storage — Samsung 990 Pro 2TB. Gen4 at 2 TB. 4K texture packs make 1 TB a short-lived choice.

PSU — MSI MAG A850GL 850W. 850 W 80+ Gold, ATX 3.1 with a native 12V-2x6 cable, the class the consensus sets for this tier. Use the native cable rather than an adapter.

Case — Fractal Design North. A mesh-front ATX mid-tower with two 140 mm fans. Check the length of your chosen RTX 5080 model against the case before you buy. More options are in the PC case buying guide.

Step down

• Same platform, cheaper card: an RTX 5070 Ti in place of the 5080. The rest of the list stays the same.
• Raster-first at 1440p: the 1440p build uses the RX 9070 XT, which averages 54 fps in Wukong at 4K High per Gamers Nexus. It is close to the 5070 Ti in some 4K rows above and well behind it in others (68 vs 97 in Final Fantasy XIV).

Who this build is for

• Yes: 4K monitors at 60–144 Hz with upscaling on, 1440p at very high refresh rates, and readers who want the strongest card the consensus parts list supports.
• No: native 4K at 120 fps or more in the newest games. No card in this guide's table does that in the heaviest games; that buyer is shopping RTX 5090 territory, which this consensus list does not cover.

Related guides

• Gaming PC Build 2026: The Reddit-Consensus Parts List (all three tiers)
• 1080p Gaming PC Build 2026: Cost, Parts, FPS
• 1440p Gaming PC Build 2026: Cost, Parts, FPS
• Build Your Own Gaming PC in 2026: The 5 Components That Actually Matter
• SpecPicks PC Builder: swap any part and re-price the build
• Best GPUs for gaming in 2026 (buying guide)

Citations and sources

• Gamers Nexus — RTX 5080 Founders Edition review and benchmarks
• Gamers Nexus — RTX 5070 Ti review and benchmarks
• Gamers Nexus — Radeon RX 9070 XT review and benchmarks
• Club386 — AMD Ryzen 7 9850X3D vs 9800X3D
• TechSpot — AMD Ryzen 7 9800X3D review
• Tom's Hardware — GPU price tracking 2026 (updated Sept 28, 2026)
• Tech Insider — DDR5 RAM prices 2026

Amazon prices in the parts table and the build total are read from Amazon.com listings within the last 24 hours and change often; a part with no current price shows no price.

This piece is editorial synthesis based on publicly available information. No independent first-party benchmarking is reported.