HW4 vs HW3
Technical Comparison
A comprehensive technical analysis of Tesla's Hardware 3 and Hardware 4 self-driving computer architectures, processing capabilities, and neural network improvements... for the hardcore nerds.
Processing Power & Architecture
| Specification | HW3 | HW4 |
|---|---|---|
| Neural Processing Units | 2× | 3× |
| TOPS (Tera Operations/Sec) | ~144 TOPS (community estimate) | ~500+ TOPS (community estimate) |
| CPU Architecture | 12-core ARM Cortex-A72 | Enhanced 20 core ARM |
| GPU Processing | Integrated Mali GPU | Enhanced integrated GPU (exact specs undisclosed) |
| Memory Bandwidth | 68 GB/s | Significantly increased (estimated 200+ GB/s) |
| DRAM | LPDDR4 (capacity not officially disclosed) | LPDDR5 (capacity not officially disclosed) |
| Power Consumption | ~72W typical | ~100W typical (more efficient per TOPS) |
| Manufacturing Process | 14nm Samsung | Advanced 7nm process |
Camera System & Vision
HW3 Camera Suite
- Resolution: 1.2 megapixel (1280×960)
- Front cameras: 3× wide, main, narrow
- Side repeaters: 2× standard definition
- Rear camera: 1× standard
- Total cameras: 8
- Dynamic range: Standard
- Frame rate: 36 fps
HW4 Camera Suite
- Resolution: 5 megapixel (2880×1620)
- Front cameras: 3× high-res (2 active, 1 dummy)
- Side repeaters: 2× high-definition
- Rear camera: 1× enhanced
- Total cameras: 8 (higher quality)
- Dynamic range: Extended (HDR)
- Frame rate: 36+ fps with better encoding
Key improvement: HW4's 5MP cameras provide 4× the resolution of HW3, enabling better object detection at longer distances and improved performance in challenging lighting conditions with HDR support.
Neural Network Architecture
Model Complexity
- Smaller, optimized networks
- Limited to fewer networks running simultaneously
- Constrained by ~144 TOPS (community estimate)
- Lower memory ceiling
- Larger, more complex networks
- Can run substantially more networks concurrently
- Leverages ~500+ TOPS (community estimate)
- Higher memory ceiling enables larger models
Training & Inference
HW4's additional compute and memory headroom can support larger models and more concurrent inference work. Tesla does not publish a complete consumer training-data specification:
- HW4 has more headroom for larger or more concurrent models.
- HW3 runs a distilled v14 Lite branch designed for its lower compute and memory ceiling.
- Both generations receive evolving neural-network software; these are not fixed hardware-only software stacks.
FSD Software Capabilities
| Feature | HW3 | HW4 |
|---|---|---|
| Navigate on Autopilot | ✓ | ✓ |
| Auto Lane Change | ✓ | ✓ |
| Autopark | ✓ | ✓ |
| Summon / Smart Summon | ✓ | ✓ |
| Traffic Light & Stop Sign Control | ✓ | ✓ |
| City Streets (FSD Supervised) | ✓ (Limited) | ✓ (Enhanced) |
| Full v14 Neural Planner | ✗ (v14 Lite branch only) | ✓ |
| Enhanced Vision in Low Light | Limited | ✓ (HDR) |
What About AI5?
Tesla has not published a complete AI5/HW5 consumer specification or transition schedule. Treat any future-year VIN result as an estimate and confirm the installed computer on the vehicle's software screen.
Sensor Suite & Redundancy
HW3
- Vision-only (no radar after 2021)
- 12 ultrasonic sensors on earlier builds (Tesla removed USS from Model 3/Y production in October 2022 and S/X in 2023 — before the HW4 transition, so many HW3 cars have none)
HW4
- Vision-only (no ultrasonic)
- High-res cameras replace USS
The Bottom Line
HW4 represents a fundamental leap forward, not just an incremental improvement. The combination of 5MP cameras, substantially more processing power, and a higher memory ceiling enables Tesla to run significantly more sophisticated neural networks that simply cannot execute on HW3.
HW3 currently continues to receive updates such as v14 Lite, but Tesla's roadmap centers on HW4. For buyers prioritizing autonomous driving capabilities, HW4 is not just recommended; it's essential for future-proofing.
Ready to check your VIN?
Use our free VIN checker to get an instant HW3 vs HW4 estimate, then confirm on the vehicle's software screen.
Check a VIN →References
This comparison combines Tesla-disclosed architecture and camera information with community-reported hardware estimates. Figures labeled “community estimate” are not Tesla specifications.
- Tesla AI materials — company-published context on autonomy hardware and software.
- Tesla Autonomy Day presentation — public architecture and redundancy discussion.
- Not a Tesla App analyses — source-linked software and rollout reporting.
Last reviewed: August 5, 2026