Living-room SFF: a 12.4 L build with a 7500F and low-profile RTX 4060 for $1,043
Console-sized machines fail on three things: CPU cooler height, GPU thickness, and power delivery in a case with no airflow path. This sheet picks parts around those three constraints in a 12.4 L chassis that fits under a TV stand.
| Slot | Part | Interface | Draw | Price |
|---|---|---|---|---|
| CPU | AMD Ryzen 5 7500F | AM5 | 65 W | $139 |
| Motherboard | ASRock B650I Lightning WIFI | AM5 | — | $199 |
| Memory | Crucial Pro DDR5-5600 CL46 2x16GB (low profile) | SODIMM-class DIMM | — | $79 |
| GPU | Gigabyte GeForce RTX 4060 OC Low Profile 8GB | PCIe 4.0 x16 | 115 W | $319 |
| Storage | Crucial P3 Plus 1TB NVMe | M.2 2280 | 5 W | $62 |
| Cooler | Thermalright AXP90-X47 Full Copper | AM5 | — | $45 |
| PSU | Corsair SF450 80+ Platinum SFX | SFX | — | $135 |
| Case | Fractal Design Ridge 12.4L | ITX | — | $65 |
| Total | 185 W | $1043 | ||
Why these parts
The 12.4 L constraint set
At this volume the case takes a 70 mm CPU cooler, a dual-slot 200 mm graphics card and an SFX power supply. That rules out every tower cooler and every triple-fan card, and it means the parts list is defined by dimensions before it is defined by performance.
The 7500F is the right CPU here because it is a 65 W part. In a 12.4 L case a 105 W chip will heat-soak the whole interior within 20 minutes and the GPU will throttle on its own exhaust.
Cooling a closed box
With a low-profile cooler the CPU sits at 78-84 °C under a sustained load, which is acceptable. The important detail is that the case needs at least one exhaust fan; a 92 mm top exhaust drops the internal air temperature by 6-8 °C and, more importantly, stops the GPU from recirculating its own hot air.
Do not run a low-profile cooler in fanless mode. It will hold 90 °C+ at idle in a closed cabinet, and the fan stop threshold on most boards will not save you.
Frame targets at 1080p and 1440p
The low-profile RTX 4060 runs 1080p Ultra at 78-95 fps in most 2023-2025 titles and 1440p Medium at 60-72 fps. The card is power-limited rather than thermally limited — its 115 W board power is the ceiling regardless of airflow.
At 4K this build is not viable for anything beyond video playback. The HDMI 2.1 output does handle 4K120 for a TV signal, which is the actual reason the 4060 is here rather than an older card.
Assembly order inside a 12.4 L case
Build in this order: CPU and cooler onto the board, then the M.2 drive, then the board into the case, then the power supply, then the GPU last. The GPU has to come out first for any future service, and the SFX PSU cable routing occupies the space above the CPU cooler.
Use a 90-degree power cable or a flat adapter if the case's internal clearance to the CPU cooler is under 15 mm. Standard IEC cables add 20-30 mm of bend radius and will press on the cooler.
Bottleneck note
At 1080p the 4060 is the limit in every title. The 7500F has headroom but will only matter if you fit a faster low-profile card later, which the SFX power supply's 450 W budget would not support.
Cooling headroom
Thermal budget: 65 W CPU plus 115 W GPU inside 12.4 L with one 92 mm exhaust. That works out to roughly 14.5 W per litre, which is at the upper end of what a passively-exhausted small case handles. Add the second 92 mm fan if the case supports it.
Verdict
A console replacement that also plays your Steam library. Not a machine to upgrade later — build it once, correctly.
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Why each check matters
Does the AXP90-X47 fit the Ridge's 70 mm limit?
Yes, with 23 mm of margin — the cooler is 47 mm tall including its fan. That margin matters because the Ridge's side panel has perforations that sit 4 mm above the nominal limit.
Why can I not use a triple-slot card in this case even if it is short?
The Ridge's GPU chamber is 2.2 slots deep with a riser cable. A card thicker than 2 slots will physically contact the riser, and a 2.5-slot card blocks the only path for the GPU's exhaust to leave the case.
Can I use a standard ATX power supply to save money?
No. The Ridge mounts SFX and SFX-L only. An ATX unit is 150 mm wide versus SFX's 125 mm and there is no bracket; the extra width also blocks the GPU chamber.
The bundled riser is PCIe 4.0 — do I need a Gen 5 one?
No. The RTX 4060 is a 4.0 x8 card, so a 4.0 riser runs it at full speed. Gen 5 risers cost $60-80 more and buy nothing with this card. Do set the BIOS slot to Gen 4 manually if you see random black screens — auto-negotiation through a riser is a known source of instability.
The power cable presses on the CPU cooler — is that a problem?
Mechanically yes: a cable resting on a spinning 92 mm fan will eventually wear through the fan frame or stop the fan. Fit a 90-degree IEC adapter, which removes about 25 mm of bend radius from the equation.
Settings to change before the first game, in the order the board exposes them.
BIOS
Enable EXPO and set the CPU fan curve with a 20% floor — a low-profile cooler that stops entirely will let the case interior soak. Also set the chassis fan header to a fixed 40% rather than a temperature curve; in a 12.4 L box the internal sensor lags the real air temperature by several minutes.
- The 12.4 L constraint set
At this volume the case takes a 70 mm CPU cooler, a dual-slot 200 mm graphics card and an SFX power supply. That rules out every tower cooler and every triple-fan card, and it means the parts list is defined by dimensions before it is defined by performance.
- Cooling a closed box
With a low-profile cooler the CPU sits at 78-84 °C under a sustained load, which is acceptable. The important detail is that the case needs at least one exhaust fan; a 92 mm top exhaust drops the internal air temperature by 6-8 °C and, more importantly, stops the GPU from recirculating its own hot air.
- Frame targets at 1080p and 1440p
The low-profile RTX 4060 runs 1080p Ultra at 78-95 fps in most 2023-2025 titles and 1440p Medium at 60-72 fps. The card is power-limited rather than thermally limited — its 115 W board power is the ceiling regardless of airflow.
- Assembly order inside a 12.4 L case
Build in this order: CPU and cooler onto the board, then the M.2 drive, then the board into the case, then the power supply, then the GPU last. The GPU has to come out first for any future service, and the SFX PSU cable routing occupies the space above the CPU cooler.
What to change first when this machine stops being enough.
- GPU: the SFX 450 W unit caps you at about a 160 W card. A 4060 Ti low-profile would fit electrically but not thermally in this case.
- Storage: the second M.2 slot is on the back of the board and requires removing the board to access — fit both drives at build time.
- Cooling: there is no upgrade. The 70 mm height limit is the case's hard constraint.
- Memory: 32 GB is worth it if the machine doubles as a light VM host; 16 GB is enough for a media and gaming box.
Editorial note
RigWise sheets are written by hobbyists from our own bench builds, for information only — they are not a professional assessment of your particular machine, and no compatibility result here is a guarantee. Where a step involves mains wiring or a part you have not handled before, get a qualified second opinion before you buy or power on.