Camera Resolution
The camera system represents one of the most significant upgrades from HW3.0 to HW4.0. The older hardware utilized approximately 1.2MP cameras, while the newer version boasts around 5MP sensors (Sony IMX490), delivering substantially better field of view, HDR capabilities, and night vision performance.
| Parameter | HW3.0 | HW4.0 |
|---|---|---|
| Front Camera | 1280×960 (~1.2MP) | 2896×1876 (~5.4MP) |
| HDR Support | Limited | Enhanced |
| Night Vision | Basic | Advanced |
Computing Power
The FSD (Full Self-Driving) computer processing capability has seen dramatic improvement between generations. HW3.0 utilizes Samsung’s 14nm process technology, delivering approximately 144 TOPS (Trillion Operations Per Second). In contrast, HW4.0 employs a more advanced 7nm process with a 20-core CPU, delivering over 300 TOPS—making it 3 to 5 times faster than its predecessor.
This increased computational capacity enables HW4.0 to process more camera feeds simultaneously, run more complex neural networks, and make driving decisions with greater speed and accuracy.
Radar System
HW3.0 includes a front-mounted millimeter-wave radar, which has been a standard safety feature in many vehicles. HW4.0 reserves an interface for Phoenix 4D imaging radar, though most vehicles were shipped without the hardware installed or the software enabled. This strategic positioning allows Tesla to reintroduce radar capabilities in the future if needed, while currently relying on vision-only approaches.
Ultrasonic Sensors
The evolution of Tesla’s sensor suite shows a clear trend toward vision-centric perception:
- HW3.0: Equipped with 12 Ultrasonic Sensors (USS) for proximity detection
- HW4.0: Completely removes USS, relying entirely on Tesla Vision parking assistance
This transition reflects Tesla’s confidence in computer vision systems and represents a philosophical commitment to camera-based autonomy, eliminating sensors that were considered redundant with advanced visual processing.
In-Vehicle Entertainment
The infotainment system also received a substantial upgrade:
- HW3.0: Intel Atom processor (MCU2)
- HW4.0: AMD Ryzen processor (MCU3), delivering significantly smoother user experience
The more powerful AMD chip enables faster response times, smoother scrolling, and improved overall system responsiveness for the center display and connected features.
Real-World Driving Scenarios
Under identical FSD software versions, the practical differences between HW3.0 and HW4.0 vehicles in daily driving are relatively limited, though some distinctions emerge in specific scenarios:
Reverse Parking
HW4.0’s higher-resolution cameras and improved visual processing deliver superior performance in parking scenarios, providing more accurate obstacle detection and smoother automated parking maneuvers.
Lane Changes
The enhanced computational power of HW4.0 enables faster decision-making during lane changes, processing surrounding traffic information more rapidly and executing maneuvers with reduced latency.
Narrow Roadways
HW4.0’s improved visual perception offers more precise detection of obstacles and road boundaries in constrained spaces, providing drivers with greater confidence when navigating tight passages.
Adverse Weather Conditions
Both hardware versions rely primarily on vision-based systems, resulting in comparable performance in challenging weather such as heavy rain, fog, or snow. Neither system demonstrates significant advantage in these conditions.
Summary
The transition from HW3.0 to HW4.0 represents Tesla’s hardware evolution strategy: significantly improved computing power, higher-resolution cameras, and a decisive shift toward vision-only autonomy. While everyday driving differences may be subtle, the enhanced capabilities of HW4.0 provide a more robust foundation for future FSD software advancements and increasingly autonomous driving features.