AMD Radeon 840M vs NVIDIA RTX 4000 Mobile Ada Generation Comparison

Head-to-Head Benchmarks

The database contains no recorded head-to-head benchmark scores for the AMD Radeon 840M versus the NVIDIA RTX 4000 Mobile Ada Generation. With zero wins recorded for either side, the comparative performance picture must be assembled from the raw specification data rather than direct measured outcomes. Both products sit at the 50th percentile against all GPUs in the database, which places them in the middle of the overall distribution, yet their architectural profiles could hardly be more different.

The absence of benchmark entries means the raw compute figures become the primary comparison tool. The RTX 4000 Mobile delivers 24.72 TFLOPS of FP32 throughput and 24.72 TFLOPS of FP16 (1:1), while the Radeon 840M produces 1,484.8 GFLOPS in both FP32 and FP16. That translates to a roughly 16.6 times advantage for the NVIDIA part in raw floating-point work, a gap that dwarfs any other single specification difference. The pixel rate tells a similar story: 133.2 GPixel/s for the RTX 4000 Mobile versus 23.20 GPixel/s for the Radeon 840M, a 5.7 times difference. Texture rate shows 386.3 GTexel/s against 46.40 GTexel/s, an 8.3 times spread.

Clock speeds complicate the picture. The Radeon 840M runs a base clock of 400 MHz and boosts to 2900 MHz, while the RTX 4000 Mobile has a base of 1290 MHz and a boost of 1665 MHz. The AMD part boosts considerably higher, yet the NVIDIA chip compensates with a far larger execution resource pool. The shading unit count is 7424 for the RTX 4000 Mobile versus 256 for the Radeon 840M, a 29 times difference. Texture mapping units stand at 232 versus 16, and render output units at 80 versus 8. These structural disparities mean the higher boost clock on the AMD side cannot close the throughput gap.

Memory bandwidth reinforces the NVIDIA advantage. The RTX 4000 Mobile uses 12 GB of GDDR6 memory across a 192-bit bus, delivering 432.0 GB/s of bandwidth. The Radeon 840M relies on System Shared memory, with bandwidth listed as System Dependent, meaning its performance scales with the host platform's memory configuration rather than a dedicated VRAM pool. The memory clock for the NVIDIA part is 2250 MHz, or 18 Gbps effective, while the AMD part's memory clock is simply listed as System Shared.

Architecture Differences

The two GPUs represent fundamentally different design philosophies. The AMD Radeon 840M uses the Krackan Point chip built on RDNA 3.5 architecture, fabricated on a 4 nm process at TSMC. It belongs to the Navi III IGP generation, specifically the Strix Point Mobile lineup. The NVIDIA RTX 4000 Mobile Ada Generation uses the AD104 chip on Ada Lovelace architecture, fabricated on a 5 nm process, also at TSMC. The transistor counts are starkly divergent: the RTX 4000 Mobile packs 35,800 million transistors on a 294 mm² die, with a transistor density of 121.8M per mm². The Radeon 840M's transistor count and die size are listed as unknown, making a direct comparison of physical implementation impossible.

Ray tracing hardware differs substantially. The RTX 4000 Mobile contains 58 RT cores, while the Radeon 840M has 4. Tensor cores represent another major divergence: the NVIDIA part has 232 tensor cores, while the AMD part lists none. Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, so API compatibility is identical. The power envelope tells a dramatic story: the RTX 4000 Mobile has a TDP of 110 W, versus 15 W for the Radeon 840M. Both are listed as IGP slot width with no power connectors, and both have display outputs described as Portable Device Dependent.

The bus interface differs as well. The RTX 4000 Mobile uses PCIe 4.0 x16, while the Radeon 840M uses PCIe 4.0 x8. That halves the available host bandwidth for the AMD part, though its System Shared memory configuration already depends on the host platform's memory subsystem. The NVIDIA part's dedicated 12 GB GDDR6 frame buffer provides deterministic memory performance, whereas the Radeon 840M's performance would vary with the system's RAM speed and architecture.

Release timing separates the two as well. The NVIDIA RTX 4000 Mobile Ada Generation launched on March 20, 2023, succeeding the Ampere-MW generation. The AMD Radeon 840M launched on February 28, 2025, succeeding the Navi II IGP. The NVIDIA part already has a successor, Blackwell-MW, while the AMD part has no successor listed. Both are currently marked Active in production status.

Where Each One Wins

The RTX 4000 Mobile wins decisively in raw compute throughput, memory bandwidth, and feature hardware. Its 7424 shading units and 232 tensor cores make it suited for workloads that leverage massive parallelism, including machine learning inference, ray-traced rendering, and high-resolution content creation. The 12 GB GDDR6 frame buffer with 432.0 GB/s bandwidth allows large datasets to reside on the GPU without host memory round-trips, which matters for professional 3D workloads and video editing. The 58 RT cores provide dedicated hardware for ray tracing acceleration, a feature the Radeon 840M's 4 RT cores cannot match in scale.

The Radeon 840M wins in power efficiency. Its 15 W TDP is a fraction of the RTX 4000 Mobile's 110 W, making it suitable for thin-and-light portable devices where thermal and battery constraints dominate. The 2900 MHz boost clock indicates the architecture can scale frequency aggressively when power headroom allows, and the RDNA 3.5 architecture's 4 nm process node gives it a manufacturing advantage over the 5 nm node used by the NVIDIA part. The System Shared memory design means no dedicated VRAM allocation is needed, reducing component count and potentially allowing more flexible system configurations.

For gaming, the RTX 4000 Mobile's raw throughput suggests it can handle higher resolutions and detail settings, while the Radeon 840M would be limited to lighter titles or lower settings. The 8.3 times texture rate advantage and 5.7 times pixel rate advantage for the NVIDIA part point to substantial fill-rate headroom. For productivity applications that rely on CUDA-style tensor acceleration, the RTX 4000 Mobile's 232 tensor cores provide dedicated hardware that the Radeon 840M lacks entirely.

FAQ

Q: Which GPU has higher raw compute performance?

A: The RTX 4000 Mobile delivers 24.72 TFLOPS in both FP32 and FP16, compared to 1,484.8 GFLOPS for the Radeon 840M, an approximate 16.6 times advantage for the NVIDIA part.

Q: How do the memory subsystems compare?

A: The RTX 4000 Mobile uses 12 GB of GDDR6 memory on a 192-bit bus with 432.0 GB/s bandwidth. The Radeon 840M uses System Shared memory with System Dependent bandwidth, meaning its memory performance depends on the host platform.

Q: Are both GPUs on the same manufacturing process?

A: No. The Radeon 840M uses a 4 nm process at TSMC, while the RTX 4000 Mobile uses a 5 nm process, also at TSMC. The RTX 4000 Mobile has a known transistor count of 35,800 million on a 294 mm² die, while the Radeon 840M's transistor data is unknown.

Q: What are the power requirements for each GPU?

A: The Radeon 840M has a TDP of 15 W, while the RTX 4000 Mobile has a TDP of 110 W. Both are listed as IGP slot width with no power connectors.

Q: Do both GPUs support the same APIs?

A: Yes, both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: When did each GPU launch?

A: The NVIDIA RTX 4000 Mobile Ada Generation launched on March 20, 2023, and the AMD Radeon 840M launched on February 28, 2025. Both are currently Active in production status.

The Verdict

The data indicates a clear performance hierarchy. The RTX 4000 Mobile Ada Generation holds overwhelming advantages in shading units (7424 versus 256), texture mapping units (232 versus 16), render output units (80 versus 8), ray tracing cores (58 versus 4), and tensor cores (232 versus none). Its memory system provides 432.0 GB/s of dedicated bandwidth against a System Shared configuration with System Dependent bandwidth. The FP32 throughput difference of 24.72 TFLOPS versus 1,484.8 GFLOPS places these GPUs in entirely different performance classes.

The Radeon 840M's advantages are limited to power consumption (15 W versus 110 W), process node (4 nm versus 5 nm), and boost clock (2900 MHz versus 1665 MHz). These factors make it viable for power-constrained portable devices, but the specification data does not suggest competitive performance parity. The 50th percentile ranking for both products against all GPUs in the database seems misleading given the magnitude of the specification differences, though the percentile calculation may incorporate factors beyond raw compute, such as power efficiency or market positioning.

Users requiring dedicated graphics memory, tensor acceleration, or high-throughput ray tracing should choose the RTX 4000 Mobile Ada Generation. Users prioritizing minimal power draw in an integrated form factor with no dedicated VRAM allocation should consider the Radeon 840M. The database shows no benchmark results to refine this assessment, so the specification comparison stands as the primary evidence.

Specification Differences

| Specification | AMD Radeon 840M | NVIDIA RTX 4000 Mobile Ada Generation |

|---|---|---|

| Architecture | RDNA 3.5 | Ada Lovelace |

| Process Node | 4 nm | 5 nm |

| Transistors | Unknown | 35,800 million |

| Die Size | Unknown | 294 mm² |

| Transistor Density | Unknown | 121.8M / mm² |

| Base Clock | 400 MHz | 1290 MHz |

| Boost Clock | 2900 MHz | 1665 MHz |

| Memory Clock | System Shared | 2250 MHz (18 Gbps effective) |

| Memory Size | System Shared | 12 GB |

| Memory Type | System Shared | GDDR6 |

| Memory Bus Width | System Shared | 192 bit |

| Memory Bandwidth | System Dependent | 432.0 GB/s |

| Shading Units | 256 | 7424 |

| TMUs | 16 | 232 |

| ROPs | 8 | 80 |

| RT Cores | 4 | 58 |

| Tensor Cores | None | 232 |

| Pixel Rate | 23.20 GPixel/s | 133.2 GPixel/s |

| Texture Rate | 46.40 GTexel/s | 386.3 GTexel/s |

| FP32 | 1,484.8 GFLOPS | 24.72 TFLOPS |

| FP16 | 1,484.8 GFLOPS (1:1) | 24.72 TFLOPS (1:1) |

| TDP | 15 W | 110 W |

| Bus Interface | PCIe 4.0 x8 | PCIe 4.0 x16 |

| Release Date | 2025-02-28 | 2023-03-20 |

| Predecessor | Navi II IGP | Ampere-MW |

| Successor | None | Blackwell-MW |