AMD Radeon 840M vs NVIDIA GeForce RTX 4080 Mobile Comparison

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark entries for the AMD Radeon 840M against the NVIDIA GeForce RTX 4080 Mobile, so the comparison rests entirely on the recorded scores for the RTX 4080 Mobile and the architectural data for both parts. The Radeon 840M has no benchmark scores listed, which leaves its performance profile unquantified in our measurements. The RTX 4080 Mobile, by contrast, has a full suite of recorded results.

The RTX 4080 Mobile delivers a Geekbench OpenCL score of 159575 and a Geekbench Vulkan score of 145807. These two figures indicate strong compute throughput in both general-purpose and graphics-API workloads. The Passmark suite adds further detail: DirectX 10 scores 157, DirectX 11 scores 244, DirectX 12 scores 96, DirectX 9 scores 286, G2D scores 929, G3D scores 24926, and GPU compute scores 11191. The G3D score of 24926 is the standout, confirming that the RTX 4080 Mobile handles rasterized 3D rendering at a level far beyond what an integrated GPU with 256 shading units could plausibly reach. The compute score of 11191 reinforces that pattern.

The Radeon 840M, with its 256 shading units, 16 texture mapping units, and 8 render output units, computes a theoretical pixel rate of 23.20 GPixel/s and a texture rate of 46.40 GTexel/s. The RTX 4080 Mobile, with 7424 shading units, 232 TMUs, and 80 ROPs, reaches 133.2 GPixel/s and 386.3 GTexel/s. These derived rates are not benchmark scores, but they illustrate the scale of the gap. The RTX 4080 Mobile's FP32 throughput is listed as 24.72 TFLOPS, while the Radeon 840M is listed at 1,484.8 GFLOPS, which is 1.48 TFLOPS. That is a factor of roughly 16.6 in raw floating-point capacity. The Radeon 840M's FP16 figure is identical to its FP32 at 1,484.8 GFLOPS with a 1:1 ratio, and the RTX 4080 Mobile also runs FP16 at 24.72 TFLOPS with a 1:1 ratio, so neither part gains an advantage from reduced-precision math.

The RTX 4080 Mobile sits at the 81st percentile among all GPUs in the database, with an average benchmark score of 38135. Its nearest rivals are tightly clustered: the NVIDIA GeForce MX570 scores 38299 with a delta of -0.4%, the NVIDIA GeForce RTX 5080 Mobile scores 38349 with a delta of -0.6%, the NVIDIA GeForce RTX 4070 scores 37648 with a delta of 1.3%, and the NVIDIA Tesla P4 scores 37628 with a delta of 1.3%. The RTX 4080 Mobile is effectively within a rounding error of the MX570 and RTX 5080 Mobile, and it leads the RTX 4070 and Tesla P4 by only 1.3%. The Radeon 840M holds the 50th percentile among all GPUs, but with no average score recorded, that percentile is based on its specification profile rather than measured results.

The Verdict

The data points to a decisive performance hierarchy. The RTX 4080 Mobile is a discrete-class part with 7424 shading units, 58 RT cores, 232 tensor cores, and 12 GB of dedicated GDDR6 memory on a 192-bit bus with 432.0 GB/s of bandwidth. The Radeon 840M is an integrated graphics processor with 256 shading units, 4 RT cores, no tensor cores, and system-shared memory whose bandwidth is listed as system dependent. Every measurable specification favors the NVIDIA part by a wide margin.

For users who need sustained high-frame-rate gaming, GPU compute, or ray-traced workloads, the RTX 4080 Mobile is the only rational choice from this comparison. Its 81st percentile ranking and recorded benchmark scores confirm that it operates in a performance class that the Radeon 840M, at the 50th percentile with no scores, cannot approach. The Radeon 840M is instead a part for lightweight portable devices where the 15 W TDP and integrated design matter more than raw throughput. The RTX 4080 Mobile draws 110 W, so it belongs in larger laptops with adequate cooling and power delivery. The Radeon 840M's 15 W envelope suits thin-and-light systems where battery life and thermals take priority.

The absence of head-to-head benchmark data means no per-test victory margins can be stated. What the recorded data does show is that the RTX 4080 Mobile delivers a Passmark G3D score of 24926, which is a strong result for mobile hardware, and a GPU compute score of 11191. The Radeon 840M has no comparable figures, which prevents any quantitative win count. The specification gap alone, however, makes the performance outcome unambiguous.

Architecture Differences

The two GPUs come from different architectural generations and design philosophies. The AMD Radeon 840M uses the RDNA 3.5 architecture on a chip called Krackan Point, and it belongs to the Navi III IGP generation for Strix Point Mobile. The process node is 4 nm at TSMC. The NVIDIA GeForce RTX 4080 Mobile uses the Ada Lovelace architecture on the AD104 chip, part of the GeForce 40 Mobile generation, fabricated on a 5 nm process at TSMC. The process node difference gives AMD a slight manufacturing advantage in transistor density, but the RTX 4080 Mobile compensates with a much larger and more complex die.

The RTX 4080 Mobile has 35,800 million transistors on a 294 mm² die, yielding a transistor density of 121.8 million per square millimeter. The Radeon 840M's transistor count and die size are listed as unknown, so no direct density comparison is possible. The RTX 4080 Mobile integrates 58 RT cores and 232 tensor cores, while the Radeon 840M has 4 RT cores and no tensor cores at all. This difference is critical for ray tracing and AI-accelerated workloads. The Radeon 840M can trace rays with its 4 dedicated RT cores, but it lacks the tensor hardware that NVIDIA uses for DLSS and similar features. The RTX 4080 Mobile's 232 tensor cores give it a substantial edge in any workload that uses tensor operations.

Both parts support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, so API-level feature support is identical. The Radeon 840M is built on RDNA 3.5, which is AMD's latest integrated graphics architecture, while the RTX 4080 Mobile uses NVIDIA's Ada Lovelace, which is one generation old by the time of the Radeon 840M's release. The Radeon 840M's generation is listed as Navi III IGP for Strix Point Mobile, and its predecessor is Navi II IGP. The RTX 4080 Mobile's predecessor is GeForce 30 Mobile, and its successor is GeForce 50 Mobile. The Radeon 840M has no listed successor.

Specification Differences

The two parts differ in nearly every measurable specification. The Radeon 840M has a base clock of 400 MHz and a boost clock of 2900 MHz. The RTX 4080 Mobile has a base clock of 1290 MHz and a boost clock of 1665 MHz. The AMD part boosts much higher, but its smaller execution resources mean the higher clock does not translate into competitive throughput.

Memory configuration is a major differentiator. The Radeon 840M uses system-shared memory with a system-shared bus width and system-dependent bandwidth. The RTX 4080 Mobile has 12 GB of dedicated GDDR6 memory on a 192-bit bus with 432.0 GB/s of bandwidth and a memory clock of 2250 MHz with 18 Gbps effective speed. Dedicated memory with high bandwidth is essential for the RTX 4080 Mobile's performance class, and the Radeon 840M's reliance on shared system memory is a fundamental limitation.

The shading units number 256 on the Radeon 840M versus 7424 on the RTX 4080 Mobile. Texture mapping units are 16 versus 232. Render output units are 8 versus 80. Ray tracing cores are 4 versus 58. Tensor cores are absent on the AMD part and number 232 on the NVIDIA part. Pixel rate is 23.20 GPixel/s versus 133.2 GPixel/s. Texture rate is 46.40 GTexel/s versus 386.3 GTexel/s. FP32 throughput is 1,484.8 GFLOPS versus 24.72 TFLOPS. FP16 throughput follows the same 1:1 pattern for both.

Power consumption differs by a factor of more than seven. The Radeon 840M has a TDP of 15 W, while the RTX 4080 Mobile has a TDP of 110 W. Both are listed as IGP slot width with no power connectors and portable-device-dependent display outputs. The bus interface differs: PCIe 4.0 x8 for the Radeon 840M and PCIe 4.0 x16 for the RTX 4080 Mobile. The wider bus on the NVIDIA part provides more bandwidth for data transfer from the CPU. The release dates are far apart, with the RTX 4080 Mobile releasing on 2023-01-02 and the Radeon 840M releasing on 2025-02-28. Both are marked as Active in production status. Neither part has a launch MSRP in the database.

FAQ

Q: Which GPU has a higher boost clock?

A: The AMD Radeon 840M boosts to 2900 MHz, while the NVIDIA GeForce RTX 4080 Mobile boosts to 1665 MHz. The AMD part has a significantly higher clock speed, but this does not compensate for its much smaller execution resource pool.

Q: How much memory does each GPU have?

A: The NVIDIA GeForce RTX 4080 Mobile has 12 GB of dedicated GDDR6 memory on a 192-bit bus with 432.0 GB/s bandwidth. The AMD Radeon 840M uses system-shared memory with a system-shared bus width and system-dependent bandwidth.

Q: What is the power draw of each GPU?

A: The AMD Radeon 840M has a TDP of 15 W. The NVIDIA GeForce RTX 4080 Mobile has a TDP of 110 W. The RTX 4080 Mobile requires substantially more power to deliver its performance.

Q: Do both GPUs support ray tracing?

A: Yes, both support DirectX 12 Ultimate (12_2), which includes ray tracing. The AMD Radeon 840M has 4 RT cores, while the NVIDIA GeForce RTX 4080 Mobile has 58 RT cores. The RTX 4080 Mobile also has 232 tensor cores, which the Radeon 840M lacks entirely.

Q: How does the RTX 4080 Mobile compare to its nearest rivals in the database?

A: The RTX 4080 Mobile has an average benchmark score of 38135. It is 0.4% behind the NVIDIA GeForce MX570 (38299), 0.6% behind the NVIDIA GeForce RTX 5080 Mobile (38349), and 1.3% ahead of both the NVIDIA GeForce RTX 4070 (37648) and the NVIDIA Tesla P4 (37628).

Q: What percentile does each GPU occupy in the database?

A: The AMD Radeon 840M is at the 50th percentile among all GPUs. The NVIDIA GeForce RTX 4080 Mobile is at the 81st percentile. The RTX 4080 Mobile ranks well above the midpoint, while the Radeon 840M sits exactly at the median.

Where Each One Wins

The NVIDIA GeForce RTX 4080 Mobile wins in every performance category where data exists. Its recorded Passmark G3D score of 24926 and GPU compute score of 11191 place it in a different tier from the Radeon 840M, which has no recorded scores. The RTX 4080 Mobile's 7424 shading units, 58 RT cores, and 232 tensor cores make it suitable for demanding gaming, ray-traced rendering, and compute-heavy tasks. Its 12 GB of dedicated GDDR6 memory with 432.0 GB/s bandwidth ensures that large textures and datasets fit in local memory without relying on system RAM. The 110 W TDP indicates that this GPU is designed for performance-oriented laptops with robust cooling.

The AMD Radeon 840M wins in power efficiency and integration. Its 15 W TDP is a fraction of the RTX 4080 Mobile's 110 W, making it appropriate for thin and light portable devices where battery life and thermal limits are primary constraints. Its 4 nm process node at TSMC is smaller than the RTX 4080 Mobile's 5 nm node, and its 400 MHz base clock with 2900 MHz boost clock shows that it can scale frequency aggressively when needed. The Radeon 840M's system-shared memory design eliminates the cost and complexity of dedicated VRAM, which suits integrated graphics in compact laptops. Its PCIe 4.0 x8 interface is sufficient for an IGP, while the RTX 4080 Mobile uses PCIe 4.0 x16.

For users who prioritize raw frame rates, high-resolution textures, ray tracing, or GPU compute, the RTX 4080 Mobile is the clear choice from the recorded data. For users who need a low-power integrated solution that can handle basic graphics and light workloads in a portable chassis, the Radeon 840M is the appropriate selection. The 81st percentile ranking of the RTX 4080 Mobile versus the 50th percentile of the Radeon 840M summarizes the performance gap, and the specification differences confirm that these two parts serve entirely different market segments.