Lumen Two | RTX 5070 12GB + Ryzen 7 7800X3D | Ready-to-Go Gaming PC | PC36

🌅 Lumen Two

Serious 1440p, hidden in a 10.4 litre box

Lumen Two is the Fractal Terra doing what it was built for. The Ryzen 7 7800X3D and RTX 5070 make a properly quick 1440p machine, and the whole thing occupies about the footprint of a hardback book laid flat.

The 7800X3D matters here for a reason that is easy to miss. It is faster in games than processors that draw twice the power, and in a case this size the power a part does not draw is heat you do not have to move. It is the rare component that is both the quick choice and the sensible one.

Anodised aluminium, a solid walnut front, and no lighting anywhere. If you want a gaming PC that does not announce itself, this is the one.

🧬 Built to last, designed to evolve

This system is built on AMD's latest AM5 platform, which offers one of the best upgrade paths available today. That means you can start with a great processor now and still have room to move up the stack later, while keeping the same motherboard, case, power supply and most of your core components. Graphics card, storage and cooling all remain straightforward to change later, within the space limits any small form factor build has.

📃 Specifications

• 🧠 CPU: AMD Ryzen 7 7800X3D
  Click or tap for deeper spec info

  • 8 cores, 16 threads of Zen 4 with 96MB of L3 cache, courtesy of AMD's 3D V-Cache stacked directly onto the compute die
  • The chip that made X3D the default recommendation for gaming. That cache means the processor spends far less time waiting on memory, and it shows up in frame times rather than just benchmark averages. In simulation games, large open worlds and heavily modded titles the difference is not subtle
  • It draws remarkably little power for what it delivers, typically well under 100W in games. In a 10.4 litre case that is the whole argument: a processor that makes less heat needs less air, and less air means less noise. There are faster chips on paper that would be a worse choice here
  • 8 cores and 16 threads is plenty for gaming while streaming, and for creative work alongside it
• ❄️ CPU cooler: Thermalright AXP120-X67
  Click or tap for deeper spec info

  • A low-profile top-down cooler, 67mm tall, with six heatpipes and a full-size 120mm fan. Small form factor coolers are usually a compromise. This one genuinely is not
  • The 120mm fan is the point. A larger fan moves the air a 7800X3D needs while turning slowly, and fan speed is what you actually hear. Most coolers at this height use a 92mm fan and have to spin it hard
  • Top-down rather than tower, so it also pushes air across the motherboard's power stages and memory, which in a case with no through-draught is worth having
  • Its 67mm height sets where the Terra's internal spine sits, and the graphics card is chosen to suit. That is the trade this case asks you to make, and we make it deliberately rather than by accident
• 🔲 Motherboard: ASUS TUF Gaming B850I WiFi Neo (Mini-ITX)
  Click or tap for deeper spec info

  • 8+2+1 power stages rated at 80A, on a 10-layer PCB. Plain English translation: more power delivery than any AM5 processor will ask of it, and considerably more than a 7800X3D needs. The board will not be the limit if you upgrade later
  • A single 8-pin CPU power connector, which is exactly right for this chip and one less cable to route in a case with no room for spare ones
  • PCIe 5.0 x16 for the graphics card
  • Two M.2 slots, the primary one at PCIe Gen5 x4 and the second at Gen4 x4, with an M.2 heatsink fitted. One stays free, so a second drive can be added later without dismantling the machine
  • Two DDR5 slots, both used by the memory fitted. That is normal for Mini-ITX, but it does mean a capacity upgrade later means replacing the kit rather than adding to it. If you think you will want 48GB or 64GB, it is cheaper to choose it now
  • Wi-Fi 6E and Realtek 2.5 Gigabit Ethernet onboard, with 12 USB ports including a 20Gbps rear Type-C
  • PC36 only uses motherboards chosen for stability and longevity. See our Trusted brands page
• 📏 Memory / RAM: 32GB (2×16GB) DDR5-6000 CL36
  Click or tap for deeper spec info

  • EXPO-tuned dual channel DDR5-6000 CL36, the speed and timing combination Ryzen responds to best on AM5. We fit CL36 as standard rather than the slower CL40 kits often used at this price
  • 32GB is comfortable headroom for gaming, streaming and creative work at the same time, without paying for capacity that sits idle
  • Both memory slots are used, since Mini-ITX boards have two. A larger kit is available in the listing options below and is cheaper chosen now than swapped later
  • Specification guaranteed, model may vary. Happy to confirm the exact part on request
• 💾 Storage: 1TB NVMe PCIe 4.0 SSD
  Click or tap for deeper spec info

  • Rated at 5,000MB/s or better. Games load in seconds and Windows feels immediate
  • The second M.2 slot sits free, so adding a drive later is a genuine option rather than a theoretical one. That is not true of every Mini-ITX board
  • The case also takes two 2.5 inch SATA drives if you would rather expand that way
  • Specification guaranteed, model may vary. Happy to confirm the exact part on request
• 🎮 Graphics card: NVIDIA RTX 5070 12GB
  Click or tap for deeper spec info

  • Built for 1440p at high refresh, which is exactly what this machine is aimed at. High settings in modern AAA titles, and very high frame rates in competitive shooters
  • 12GB of GDDR7 on a 192-bit bus, with the Blackwell ray tracing hardware and DLSS 4 multi frame generation. In supported titles that turns ray tracing from a slideshow into something you can leave switched on
  • Card selection matters more here than in a tower. We fit a 5070 that suits the spine position the 67mm cooler requires, rather than the largest one we can find. In 10.4 litres, the card that fits properly outperforms the card that barely fits
  • The chipset and VRAM are guaranteed: it will always be an RTX 5070 with 12GB. The AIB brand varies with availability, and we only use established manufacturers. See our Trusted brands page for more info
• 🧰 Case: Fractal Terra - Silver
  Click or tap for deeper spec info

  • 10.4 litres. Anodised aluminium throughout, an 8mm thick machined aluminium front, and a solid FSC-certified walnut panel. 343mm wide, 218mm tall, 153mm deep
  • The clever part is the spine: a stepless sliding central wall that moves through 30mm, letting you trade graphics card width against CPU cooler height. Up to 77mm of cooler one way, a much fatter graphics card with 48mm of cooler the other
  • We set that spine to suit the exact cooler and card going in. It is not an adjustment you can make in a fixed chassis, and it is why the parts on this list are chosen as a set rather than assembled from whatever fits
  • Supports graphics cards up to 322mm long, and two 2.5 inch drives
  • Small form factor builds take considerably longer to assemble and cable than a standard tower. That work is included in the price rather than added to it
• 🌬️ Case cooling: 1 × 120mm base exhaust fan with protective grille, plus full-area perforated side panels
  Click or tap for deeper spec info

  • The Terra has a single 120mm mount in the base and at this specification we fit it. A 7800X3D and a 5070 make enough heat that pulling it actively out of the underside is worth the fan, which is not true of the entry build in this same case
  • We fit a grille over that fan as standard. In a chassis this tight the base fan sits exactly where loose cable ends want to fall, and a blade catching a cable is the kind of fault that is entirely preventable. It costs us a few pounds and it is not something you would ever have to think about
  • Both side panels are perforated across their full area, sitting directly alongside the graphics card and the cooler, so the card draws cool air straight through the panel beside it rather than along a duct
  • The top-down CPU cooler adds to this by pushing air down across the board rather than sideways into a panel
  • Fan curves tuned manually before dispatch, and airflow verified through our standard stress testing rather than assumed
• ⚡ Power supply: Thermaltake Toughpower SFX 750W 80+ Gold, fully modular
  Click or tap for deeper spec info

  • SFX form factor, because that is what a case this size takes. An SFX unit is roughly half the volume of a standard ATX supply and costs more for the same wattage, which is one of the hidden expenses of building small
  • 750W against a build drawing around 400W under a hard combined load. That margin keeps the unit in its quiet, efficient band and leaves room for a larger card later
  • Fully modular, which matters far more here than in a big case. In 10.4 litres there is nowhere to hide a cable you are not using, so every one we can leave in the box is one less thing obstructing airflow
  • 80 PLUS Gold rated
• 🔌 Cabling: Black cabling, routed for a small chassis
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  • Black cables throughout. The Terra has no glass panel, so nothing here is on display and the cabling is optimised for airflow and serviceability instead of looks
  • Cable routing is the hardest part of a build like this and it is where most of the assembly time goes. Done badly it blocks the airflow the case depends on
  • White internal components are available on request. Ask us on live chat before you order and we will price it up
• 📶 WiFi / Bluetooth / Ethernet: Wi-Fi 6E, Bluetooth and 2.5 Gigabit Ethernet, included
  Click or tap for deeper spec info

  • Built into the ASUS TUF Gaming B850I WiFi Neo. No separate adapter needed, and the aerial is supplied in the box
  • Wi-Fi 6E adds the 6GHz band, which is usually far less congested than 2.4 and 5GHz if your router supports it
  • 2.5 Gigabit Ethernet for a wired connection, which we would still recommend for competitive play
• 🪟 Operating system: As chosen by you from the listing options below. Windows 11 Home (OEM) is recommended.
• 🧹 Setup and optimisation: PC36 High-Class Standard. Full stress test with certificate, bloat-free installation, and BIOS set up properly
  Click or tap for deeper spec info

  PC36 High-Class Standard, included free with every build

  • Ready the moment you open the box. Your PC boots straight into Windows with a local account already set up. No account sign-in wall, no first-run questionnaire, no half-hour of setup before you can use the machine you just bought
  • BIOS updated and configured properly: manual fan curves, PBO enabled, EXPO/XMP enabled, Secure Boot enabled
  • Vanilla Windows 11 installation if you choose Windows, with no bloatware added by us, and all drivers loaded and ready to go
  • Full stress test with certificate. Every system is torture tested on CPU, RAM and GPU before dispatch, and ships with the certificate to prove it

  PC36 Premier Optimisation, available in the listing options

  • CPU tuning to bring thermals and noise down with minimal performance loss, plus a deeper strip and debloat of Windows
  • This is the option we would recommend on this build above any other. The 7800X3D responds very well to a Curve Optimiser undervolt, and in a small case less heat produced translates directly into a slower fan. A tower has airflow to spare and can absorb sloppy settings. This does not, which is exactly why the tuning is worth paying for here

  PC36 Ultimate Performance Tune, available in the listing options

  • Advanced overclocking: RAM tune, CPU tune and GPU overclock on top of everything in Premier
  • Worth being precise about what this means on an X3D chip. The 7800X3D is not overclocked by raising multipliers the way a conventional processor is, because AMD limit voltage on the stacked cache for good reason. What it responds to is a per-core Curve Optimiser undervolt, which lets it hold higher boost clocks for longer while running cooler. That suits a small case well. The GPU overclock portion returns less here than it would in a tower, simply because the thermal ceiling is lower
• 🛡️ Warranty: 3 years parts & labour (return to base)
  Click or tap for deeper spec info

  • Standard 3-year coverage included, parts and labour both
  • Optional extended warranties in the listing options below

👁️ Transparency notes

• Small form factor systems run warmer, so we set a sensible thermal limit in the BIOS that costs nothing you would notice (click or tap to read more)

  On builds like this we typically set the CPU thermal limit to around 80°C in the BIOS. That is deliberate, it protects the machine, and it costs nothing you would notice in a game. It is simply how a 10.4 litre PC is set up properly.

• The case is silver and walnut and the components inside are black, though there is no glass panel to see them through (click or tap to read more)

  The case is silver aluminium and walnut, but the components inside it are black as standard. There is no glass panel, so this is not visible in normal use. White internals are available via live chat if you would like them.

• Product images are representative photos of a similar spec in the same style. Your PC will look similar but not identical. Our support team can help clarify anything you're unsure of.
• Memory, SSD and graphics card carry a specification guarantee rather than a fixed model (click or tap to read more)

  Most parts are named models and will be what is delivered. RAM, SSD and graphics card instead carry a spec guarantee, because current market conditions make stock on those three very variable. This keeps us agile enough to offer good pricing and honest spec lists. If you want clarity on the precise models we will use, drop us a live chat on the day you're ready to purchase and we'll confirm it.

🛠️ Popular upgrade options

• Quick-add upgrades. This listing has a set of one-click upgrades chosen to fit this exact build, each one priced, in the Quick-add Upgrades section on this page. Memory, storage, optimisation, the anti-sag bracket and the extended warranty are in the build options instead. Anything not shown in either place, ask us on live chat and we will price it.
• Need a monitor, keyboard or mouse? Scroll past the add to cart button. We've paired specific peripherals to get the best out of this build.
  Click or tap for more info

  This machine is built for 1440p at high refresh. If your monitor is a 1080p 60Hz panel, that is where the next money should go, because it is currently discarding most of what this build produces.

• Memory upgrade to 48GB or 64GB: available in the listing options below.
  Click or tap for more info

  Worth deciding now rather than later, because both slots are occupied and upgrading afterwards means buying a replacement kit. Worth it if you edit video, run virtual machines or work with large 3D scenes. For gaming, including modded gaming, 32GB is not the limit here.

• Storage upgrade to 2TB: available in the listing options below.
  Click or tap for more info

  Worth it if you keep more than a handful of large games installed at once. Modern AAA installs regularly run past 150GB each. Unlike the memory, this one you can genuinely defer, since the second M.2 slot is free and the case takes two 2.5 inch drives.

• Storage upgrade to a TLC drive: available via live chat.
  Click or tap for more info

  Worth it if you capture gameplay or move large video files regularly. TLC flash holds its write speed through long sustained transfers where the standard drive slows once its cache fills. For gaming and everyday use you would not tell the two apart.

• White internal components: available via live chat.
  Click or tap for more info

  The Terra's silver and walnut exterior suits white internals nicely, though with no glass panel you will only see them when the case is open. Ask us and we will price it up.

• Anything else: speak with us via live chat. Small form factor builds have real constraints and we would rather talk through what you want before you order than have you discover a limit afterwards.

🎯 What is this PC best for?

• 1440p gaming at high settings and high refresh rates
• Competitive shooters, where the 7800X3D's cache sets a genuinely high ceiling
• Ray tracing with DLSS 4 frame generation switched on
• Streaming and creative work alongside gaming
• Desks and living rooms where a full tower is not welcome, and where the machine is meant to be looked at rather than hidden
• Buyers who want serious performance in the smallest sensible package

📊 Performance estimates (1440p)

These figures are based on 1440p resolution. FPS will be higher at 1080p. Performance varies with game updates, maps, settings and background apps. These are estimates, not guarantees.

Fortnite - 1440p Competitive Settings (click or tap to expand)

Estimated average FPS: 300-370 FPS
Native testing (no upscaling or frame generation).

Cyberpunk 2077 - 1440p Ray Tracing Medium (click or tap to expand)

Estimated average FPS: 90-115 FPS
Upscaling set to Auto (DLSS / FSR / XeSS based on GPU).

Battlefield 6 - 1440p High Settings (click or tap to expand)

Estimated average FPS: 120-150 FPS
Native testing (no upscaling or frame generation).

DaVinci Resolve - PugetBench Standard (click or tap to expand)

Estimated score: 7,000-7,500

💬 Need help?

Not sure if this is the right spec for you? Ping us on live chat and we'll help you choose the perfect PC for your games, work and budget. You'll be talking to one of us, not a chatbot.