FormD T1 V2.1 SFF Build
Compact small-form-factor gaming PC built following the Eiga Works FormD T1 5090 Air guide.
| Component | Part |
|---|---|
| CPU | AMD Ryzen 7 9800X3D |
| CPU Cooler | Thermalright AXP90-X47 Full Copper |
| Cooler Fan | Noctua NF-A9x14 HS-PWM chromax.black.swap |
| Motherboard | ASUS ROG STRIX B850-I GAMING WIFI (Mini ITX, AM5) |
| RAM | Patriot Venom 64 GB (2x32 GB) DDR5-6000 CL30 |
| Storage | Samsung 990 Pro 2 TB (M.2 PCIe 4.0 x4 NVMe) |
| GPU | NVIDIA GeForce RTX 5080 Founders Edition 16 GB |
| Case | FormD T1 V2.1 |
| Case Add-ons | T1 GPU Travel Kit, T1 PCIe SS200 Gen5 Riser, T1 Essentials Pack |
| PSU | Corsair SF1000 (2024) 80+ Platinum, SFX |
| Exhaust Fans | 2x Phanteks T30-120 |
| Contact Frame | Thermal Grizzly AM5 Contact Frame |
| Backplate | Thermal Grizzly AM5 Short Backplate |
| Thermal Paste | Thermal Grizzly Duronaut |
| Cables | Custom Black Teflon cables from CablesterCustom (24P 170mm, CPU 8P 290mm, GPU 12V2X6 300mm) |
| Screws | 12x M3 flat head 4mm, 16x M3 countersunk 5mm, 11x M3 countersunk 8mm |
This build follows the Eiga guide which targets the RTX 5090 FE, but uses an RTX 5080 FE instead. The assembly process is identical since both cards share the same Founders Edition dual-slot cooler design. Same screws as the guide.
Using MSI Afterburner (Beta with RTX 50 series support).
Method: Set Core Clock offset to -250 MHz, open Curve Editor (Ctrl+F), drag the 950mV point to target frequency, flatten everything to the right with Shift + click-drag in empty space then Shift+Enter twice.
| Stock | Undervolted (950mV/2900 + 1000mem) | |
|---|---|---|
| Core Clock | 2742 MHz | 2830 MHz |
| Memory | 1875 MHz | 2000 MHz |
| Voltage | 1.004V | 0.934V |
| Power | 251W | 251W |
| GPU Temp | 62.3°C | 61.4°C |
| VRAM Temp | 72.3°C | 72.4°C |
+88 MHz over stock at the same power draw, 1°C cooler. For reference, the RTX 5080 FE in open-air reviews (GamersNexus) runs 65-67°C -- our T1 build undervolted runs 61-63°C.
Battlefield 6 (128 players): CPU averaging 97°C at 108W, hitting the 95°C thermal throttle. EXPO auto-voltages dangerously high: VSOC 1.272V, VDDIO 1.376V.
Use the AMD Overclocking path, NOT Ai Tweaker for PBO/CO:
Advanced -> AMD Overclocking -> [Accept Disclaimer] -> Precision Boost Overdrive
| Setting | Stock | Optimized |
|---|---|---|
| PBO | Auto | Advanced |
| PBO Limits | Auto | Auto (no PPT cap -- thermal limit is enough for gaming) |
| PBO Scalar | Auto | Manual, 1X |
| Thermal Throttle Limit | 95°C | 85°C |
| Curve Optimizer | Disabled | All Cores, Negative, 20 |
| CPU SOC Voltage | Auto (1.272V) | Manual, 1.200V |
| CPU VDDIO/MC | Auto (1.376V) | 1.300V |
| CPU LLC | Auto | Level 1 |
| Global C-States | Auto | Enabled |
Note: On the B850-I, PPT/TDC/EDC values must be entered in mW and mA (e.g. 90000 for 90W).
- Thermal Throttle 85°C: CPU gently reduces boost to stay under 85°C instead of hitting the 95°C wall
- Curve Optimizer -20: Reduces voltage at every frequency point. Same performance, less heat. Single biggest efficiency gain
- VSOC 1.20V: EXPO auto was 1.272V -- too high for X3D safety (never exceed 1.3V)
- VDDIO/MC 1.30V: EXPO auto was 1.376V -- unnecessarily high for DDR5-6000
- LLC Level 1: Prevents voltage overshoots that can damage X3D chips
- No PPT cap: Gaming rarely pushes above 85-90W, so a PPT cap only limits single-core burst boosts unnecessarily
Adapted from Eiga's FanControl config (originally for 5090 FE), swapping GPU identifiers from GB202-A to GB203-A.
CPU Fan (Noctua NF-A9x14, driven by CPU Tctl/Tdie):
| Temp | Fan % |
|---|---|
| 50-60°C | 30% |
| 60-70°C | 35% |
| 70-80°C | 40% |
| 80-92°C | 45% |
| 92°C+ | 50% |
Exhaust Fans (2x Phanteks T30, driven by a Mix sensor -- max of GPU temp and CPU temp with -15°C offset):
| Temp | Fan % |
|---|---|
| 50-60°C | 40% |
| 60-65°C | 50% |
| 65-75°C | 60% |
| 75°C+ | 70% |
GPU fans left on Auto (firmware control). FanControl and MSI Afterburner both set to start with Windows minimized.
| Stock | Optimized | Change | |
|---|---|---|---|
| Score | ~20,000 | 19,650 | -1.7% |
| CPU Temp avg | 95.0°C | 81.0°C | -14°C |
| CPU Temp max | 95.6°C | 83.2°C | -12.4°C |
| Package Power avg | 110.3W | 89.4W | -20.9W |
| Package Power max | 138.6W | 90.0W | -48.6W |
| SoC Power | 16.2W | 12.7W | -3.5W |
| VSOC | 1.272V | 1.20V | -72mV |
| VDDIO | 1.376V | 1.30V | -76mV |
| Bottleneck | Thermal (95°C wall) | PPT (99.4%) | -- |
| Stock | Optimized | Change | |
|---|---|---|---|
| CPU Temp avg | 97°C | 82°C | -15°C |
| CPU Temp max | 97°C | 86.9°C | -10°C |
| Package Power avg | 108W | 84.7W | -23.3W |
| Core Clock avg | -- | 5064 MHz | Boosting freely |
| PPT Used | -- | 52% | Nowhere near limit |
Run details: 3dmark
| Metric | Score |
|---|---|
| Overall | 27,511 |
| Graphics | 31,888 |
| CPU | 15,476 |
GPU (950mV undervolt + 1000 memory):
| Metric | Avg | Max |
|---|---|---|
| GPU Clock | 2727 MHz | 2805 MHz |
| GPU Temp | 61.4°C | 67.7°C |
| VRAM Temp | 64.5°C | 72.0°C |
| GPU Power | 274.6W | 326.4W |
| TDP Used | 76.8% | 91.0% |
| Fan Speed | 40% | 43% |
CPU (CO -20, 85°C thermal limit):
| Metric | Avg | Max |
|---|---|---|
| Core Clock | 4678 MHz | 5225 MHz |
| CPU Temp | 69.5°C | 86.5°C |
| Package Power | 60.5W | 110.4W |
| PPT Used | 37.3% | 68.2% |
Graphics score of 31,888 is within the normal range for a stock RTX 5080 FE (30,229-32,642 per reviews), confirming the 950mV undervolt has no performance penalty in 3DMark. CPU barely breaks a sweat at 69.5°C average.
- GPU: +88 MHz over stock, same power, 1°C cooler
- CPU: 15°C cooler, 23W less power, 1.7% score loss
- Voltages: VSOC 1.272V -> 1.20V, VDDIO 1.376V -> 1.30V (safer for X3D longevity)
Created 2026-02-07T23:51:13+01:00, updated 2026-04-09T18:47:59+02:00 · History · Edit