AMD Radeon 840M vs NVIDIA GeForce RTX 4090 Mobile Comparison

Head-to-Head Benchmarks

The recorded data presents a stark contrast between these two mobile graphics solutions. The NVIDIA GeForce RTX 4090 Mobile holds a decisive advantage across every benchmark category, while the AMD Radeon 840M has no recorded benchmark scores in the database. The RTX 4090 Mobile achieves an average benchmark score of 43,667, placing it in the 84th percentile of all GPUs. The Radeon 840M sits at the 50th percentile with an average benchmark score of zero due to the absence of test data.

The RTX 4090 Mobile delivers its strongest results in compute-oriented workloads. In the Geekbench OpenCL test, it records a score of 180,831, while its Geekbench Vulkan result reaches 170,774. These figures indicate very strong general-purpose compute performance. The PassMark suite shows a G3D score of 27,212, which represents the most demanding graphics workload in the PassMark suite. The GPU compute score of 12,347 further confirms the compute capability.

The RTX 4090 Mobile shows more moderate results in the DirectX legacy tests. It records 310 in PassMark DirectX 9, 262 in DirectX 11, 173 in DirectX 10, and 107 in DirectX 12. These scores are far lower than the modern compute benchmarks, which reflects the nature of those older API tests rather than a weakness in the hardware itself. The G2D score of 984 indicates solid 2D performance.

Relative to its nearest rivals, the RTX 4090 Mobile sits in a tight cluster. It trails the NVIDIA RTX A6000 by 0.9 percent, with the A6000 averaging 44,075. It leads the NVIDIA Quadro M6000 by 0.8 percent, as that card averages 43,301. The GeForce RTX 5050 Mobile trails by 0.9 percent with an average of 43,268, and the Quadro M6000 24 GB trails by 0.9 percent with an average of 43,262. These margins are small, which indicates that the RTX 4090 Mobile performs at a level comparable to professional workstation cards from the same era.

The Radeon 840M has no benchmark data in the database, and therefore no direct numerical comparison can be made. Its hardware specifications suggest a fundamentally different performance class. The FP32 throughput of the Radeon 840M is 1,484.8 GFLOPS, while the RTX 4090 Mobile reaches 32.98 TFLOPS. This represents a more than twenty-fold difference in raw floating-point capability. The pixel rate of the Radeon 840M is 23.20 GPixel/s versus 189.8 GPixel/s for the RTX 4090 Mobile. The texture rate is 46.40 GTexel/s versus 515.3 GTexel/s.

The Verdict

The data supports only one conclusion: the NVIDIA GeForce RTX 4090 Mobile is in an entirely different performance tier than the AMD Radeon 840M. The RTX 4090 Mobile has an extensive set of benchmark results, a high average score, and a strong percentile ranking. The Radeon 840M has no recorded results, which prevents any quantitative performance claim.

The RTX 4090 Mobile is designed for demanding workloads that require maximum graphics throughput. Its 84th percentile ranking among all GPUs places it above the vast majority of competing parts. Its nearest rivals are professional workstation accelerators, which indicates that it competes at the top of the mobile graphics market.

The Radeon 840M is a 15 W integrated graphics processor, based on its TDP rating. It uses system-shared memory and has no dedicated VRAM. This configuration is typical of an IGP intended for basic display output and light graphics work. Its 50th percentile ranking, combined with the absence of benchmark scores, suggests it occupies the middle of the performance distribution, though the database cannot confirm this without test data.

Strictly from the recorded data, the RTX 4090 Mobile is the clear choice for any workload that demands high frame rates, large texture throughput, or substantial compute capability. The Radeon 840M is suited to systems where power consumption is the primary constraint, as its 15 W TDP is far below the 120 W TDP of the RTX 4090 Mobile.

Architecture Differences

The two GPUs use different architectures from different manufacturers. The AMD Radeon 840M uses RDNA 3.5, built on a 4 nm process at TSMC. Its chip is called Krackan Point, and it belongs to the Navi III IGP generation for Strix Point Mobile. The NVIDIA GeForce RTX 4090 Mobile uses Ada Lovelace, built on a 5 nm process at TSMC. Its chip is AD103, and it belongs to the GeForce 40 Mobile generation.

The transistor counts differ enormously. The RTX 4090 Mobile contains 45,900 million transistors on a 379 mm² die, with a transistor density of 121.1 million per square millimeter. The Radeon 840M has unknown transistor count and die size in the database, so no comparison is possible for those fields.

The execution resources show the scale of the difference. The Radeon 840M has 256 shading units, 16 texture mapping units, and 8 ROPs. The RTX 4090 Mobile has 9,728 shading units, 304 TMUs, and 112 ROPs. The RTX 4090 Mobile also includes 76 ray tracing cores and 304 tensor cores, while the Radeon 840M has 4 ray tracing cores and no tensor core field recorded.

Memory architecture is completely different. The Radeon 840M uses system-shared memory with a system-dependent bandwidth. The RTX 4090 Mobile has 16 GB of GDDR6 memory on a 256-bit bus, delivering 576.0 GB/s of bandwidth. The memory clock for the RTX 4090 Mobile is 2250 MHz, with 18 Gbps effective data rate.

Clock behavior differs as well. The Radeon 840M has a base clock of 400 MHz and a boost clock of 2900 MHz. The RTX 4090 Mobile has a base clock of 1335 MHz and a boost clock of 1695 MHz. The Radeon 840M achieves its higher boost frequency because of its much smaller execution engine and lower power envelope.

The bus interface also differs. The Radeon 840M uses PCIe 4.0 x8, while the RTX 4090 Mobile uses PCIe 4.0 x16. Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

FAQ

Q: Which GPU has a higher average benchmark score?

A: The NVIDIA GeForce RTX 4090 Mobile has an average benchmark score of 43,667. The AMD Radeon 840M has an average benchmark score of zero because no benchmark results are recorded in the database.

Q: What is the performance gap in raw FP32 throughput?

A: The RTX 4090 Mobile delivers 32.98 TFLOPS of FP32 performance, while the Radeon 840M delivers 1,484.8 GFLOPS. The RTX 4090 Mobile provides roughly twenty-two times the FP32 throughput.

Q: How much memory does each GPU have?

A: The RTX 4090 Mobile has 16 GB of GDDR6 memory on a 256-bit bus with 576.0 GB/s bandwidth. The Radeon 840M uses system-shared memory with system-dependent bandwidth.

Q: Which GPU has more shading units?

A: The RTX 4090 Mobile has 9,728 shading units. The Radeon 840M has 256 shading units.

Q: How does the RTX 4090 Mobile compare to its nearest rivals?

A: It trails the NVIDIA RTX A6000 by 0.9 percent. It leads the NVIDIA Quadro M6000 by 0.8 percent, the GeForce RTX 5050 Mobile by 0.9 percent, and the Quadro M6000 24 GB by 0.9 percent.

Q: What is the power draw difference?

A: The Radeon 840M has a TDP of 15 W. The RTX 4090 Mobile has a TDP of 120 W.

Where Each One Wins

The NVIDIA GeForce RTX 4090 Mobile wins in every recorded benchmark category. Its strongest advantage appears in compute-heavy workloads, with Geekbench OpenCL and Vulkan scores that are an order of magnitude higher than typical integrated graphics results. The 27,212 PassMark G3D score indicates strong DirectX gaming performance. The 12,347 GPU compute score shows capability in compute applications. The 576.0 GB/s memory bandwidth supports high-resolution textures and large data sets.

The RTX 4090 Mobile also wins in ray tracing, with 76 dedicated ray tracing cores versus 4 on the Radeon 840M. The 304 tensor cores provide AI acceleration that the Radeon 840M cannot match, as it has no tensor core field recorded. The 32.98 TFLOPS FP32 throughput and 515.3 GTexel/s texture rate place it firmly in the high-performance segment.

The AMD Radeon 840M has no recorded benchmark wins. Its advantages are structural rather than performance-based. The 15 W TDP allows it to operate in systems without dedicated cooling for a discrete GPU. The system-shared memory eliminates the need for separate VRAM. The 4 nm process node is smaller than the 5 nm node used by the RTX 4090 Mobile, and the base clock of 400 MHz with boost to 2900 MHz shows a wide dynamic range.

The Radeon 840M also has a lower power connector requirement, with none needed, matching the RTX 4090 Mobile in that regard. Both are marked as IGP slot width and have portable device dependent display outputs.

Specification Differences

The table below lists only the fields where the two GPUs differ in the database.

| Specification | AMD Radeon 840M | NVIDIA GeForce RTX 4090 Mobile |

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

| Architecture | RDNA 3.5 | Ada Lovelace |

| Process node | 4 nm | 5 nm |

| Transistors | unknown | 45,900 million |

| Die size | unknown | 379 mm² |

| Transistor density | not recorded | 121.1M / mm² |

| Base clock | 400 MHz | 1335 MHz |

| Boost clock | 2900 MHz | 1695 MHz |

| Memory clock | System Shared | 2250 MHz, 18 Gbps effective |

| Memory size | System Shared | 16 GB |

| Memory type | System Shared | GDDR6 |

| Memory bus | System Shared | 256 bit |

| Memory bandwidth | System Dependent | 576.0 GB/s |

| Shading units | 256 | 9728 |

| TMUs | 16 | 304 |

| ROPs | 8 | 112 |

| RT cores | 4 | 76 |

| Tensor cores | not recorded | 304 |

| Pixel rate | 23.20 GPixel/s | 189.8 GPixel/s |

| Texture rate | 46.40 GTexel/s | 515.3 GTexel/s |

| FP32 | 1,484.8 GFLOPS | 32.98 TFLOPS |

| FP16 | 1,484.8 GFLOPS (1:1) | 32.98 TFLOPS (1:1) |

| TDP | 15 W | 120 W |

| Bus interface | PCIe 4.0 x8 | PCIe 4.0 x16 |

| Release date | 2025-02-28 | 2023-01-02 |

| Predecessor | Navi II IGP | GeForce 30 Mobile |

| Successor | not recorded | GeForce 50 Mobile |

| Percentile vs all GPUs | 50 | 84 |

| Average benchmark score | 0 | 43,667 |

The common fields include manufacturer differences (AMD versus NVIDIA), the DirectX 12 Ultimate (12_2) API support, OpenGL 4.6, Vulkan 1.4, the IGP slot width, no power connectors, and portable device dependent display outputs. Both are listed as Active in production status, and neither has a launch MSRP recorded.