AMD Radeon 840M vs NVIDIA GeForce RTX 4090 D Comparison

Head-to-Head Benchmarks

The recorded data presents a stark asymmetry between these two GPUs. The AMD Radeon 840M, an integrated graphics processor, has no individual benchmark scores listed in the database, while the NVIDIA GeForce RTX 4090 D has three recorded test results. This means every measurable performance comparison is defined by the NVIDIA part's output.

In the 3DMark Steel Nomad DX12 test, the RTX 4090 D records a score of 8,587. This is a demanding modern workload that stresses raw rasterization and compute throughput. The database places this result within the context of the GPU's overall standing, which rests at the 98th percentile among all GPUs. For the Radeon 840M, the percentile rank sits at 50, indicating a mid-pack position in the broader database, but with a recorded average benchmark score of zero, there is no direct numeric contest.

The Geekbench OpenCL score for the RTX 4090 D is 278,621. This is a compute-centric test that measures general-purpose GPU performance across a wide range of workloads. The Geekbench Vulkan score follows at 246,941, showing a slight reduction compared to the OpenCL result. The delta between these two scores indicates that the NVIDIA architecture handles the two APIs with different efficiencies, with OpenCL delivering the higher figure.

The average benchmark score for the RTX 4090 D is 178,050. This aggregate figure is pulled from the three recorded tests. The nearest rival in the database, the NVIDIA RTX PRO 5000 Blackwell, posts an average score of 182,109, which places the RTX 4090 D at a 2.2 percent deficit relative to that card. The NVIDIA A100 SXM4 80 GB sits at 183,725, a 3.1 percent advantage over the RTX 4090 D. The RTX 5000 Ada Generation records 184,664, which is 3.6 percent higher. The A100 SXM4 40 GB leads the group at 187,147, putting the RTX 4090 D 4.9 percent behind.

These deltas show that the RTX 4090 D, despite its high absolute scores, is not the top performer in its immediate peer group. It trails four other NVIDIA accelerators by margins ranging from 2.2 percent to 4.9 percent. The RTX 4090 D still commands a massive lead over the integrated Radeon 840M, but the database indicates that it does not dominate its own class.

The Verdict

The data supports only one direction for raw performance. The RTX 4090 D delivers 73.54 TFLOPS of FP32 compute, while the Radeon 840M delivers 1,484.8 GFLOPS. The difference is several orders of magnitude. The RTX 4090 D also has 24 GB of dedicated GDDR6X memory on a 384-bit bus with 1.01 TB/s of bandwidth. The Radeon 840M uses system shared memory with bandwidth listed as system dependent, which means its memory performance is tied to the host platform, not a fixed specification.

The RTX 4090 D is a triple-slot discrete card with a 425 W TDP and an 800 W suggested power supply. The Radeon 840M is an IGP with a 15 W TDP and no power connectors. The RTX 4090 D is marked as end-of-life, while the Radeon 840M is active. The RTX 4090 D has a launch MSRP of 1,599 USD, and the Radeon 840M has no listed launch MSRP.

The choice is straightforward from the recorded specifications. The RTX 4090 D is for workloads that demand maximum compute, memory bandwidth, and ray tracing throughput. The Radeon 840M is for portable or low-power systems where a discrete GPU is not an option. The database does not list a single benchmark where the Radeon 840M wins, and it records zero wins for the integrated part. The RTX 4090 D records three benchmark scores, all of which are substantial, and it holds the 98th percentile rank.

Architecture Differences

The two GPUs come from different manufacturers and different design philosophies. The AMD Radeon 840M uses the RDNA 3.5 architecture, built on a 4 nm process at TSMC. It is part of the Navi III IGP generation, specifically from the Krackan Point chip. The NVIDIA GeForce RTX 4090 D uses the Ada Lovelace architecture, built on a 5 nm process, also at TSMC. The RTX 4090 D is part of the GeForce 40 series and uses the AD102 chip.

The transistor counts differ enormously. The RTX 4090 D has 76,300 million transistors on a 609 mm² die, giving a transistor density of 125.3 million per square millimeter. The Radeon 840M has an unknown transistor count and die size. The process node advantage goes to the AMD part at 4 nm, but the scale of the NVIDIA chip dwarfs the integrated solution.

The core configurations tell a clear story. The Radeon 840M has 256 shading units, 16 texture mapping units, and 8 render output units. It includes 4 ray tracing cores. The RTX 4090 D has 14,592 shading units, 456 TMUs, and 176 ROPs. It includes 114 ray tracing cores and 456 tensor cores. The NVIDIA part also supports FP16 at the same rate as FP32, which is 73.54 TFLOPS. The AMD part does the same, with FP16 and FP32 both at 1,484.8 GFLOPS.

Clock speeds differ in character. The Radeon 840M has a base clock of 400 MHz and a boost clock of 2,900 MHz. The RTX 4090 D has a base clock of 2,280 MHz and a boost clock of 2,520 MHz. The AMD part has a much wider range between base and boost, while the NVIDIA part runs closer to its maximum consistently. The pixel rate for the Radeon 840M is 23.20 GPixel/s, and its texture rate is 46.40 GTexel/s. The RTX 4090 D delivers 443.5 GPixel/s and 1,149.1 GTexel/s.

The memory subsystem is fundamentally different. The Radeon 840M uses system shared memory with a shared bus width and a system dependent bandwidth. The RTX 4090 D uses 24 GB of GDDR6X on a 384-bit interface with 1.01 TB/s of bandwidth. The memory clock for the NVIDIA part is listed as 1,313 MHz with 21 Gbps effective. The AMD part has no fixed memory clock because it relies on system memory.

The bus interface also differs. The Radeon 840M uses PCIe 4.0 x8, while the RTX 4090 D uses PCIe 4.0 x16. The display outputs for the AMD part are listed as portable device dependent, while the NVIDIA part has 1x HDMI 2.1 and 3x DisplayPort 1.4a. Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

FAQ

Q: How does the Radeon 840M compare to the RTX 4090 D in FP32 compute?

A: The RTX 4090 D delivers 73.54 TFLOPS of FP32 performance, while the Radeon 840M delivers 1,484.8 GFLOPS. The NVIDIA part is roughly 50 times higher, based on the recorded figures.

Q: What is the memory configuration of each GPU?

A: The Radeon 840M uses system shared memory with a shared bus width and system dependent bandwidth. The RTX 4090 D has 24 GB of GDDR6X on a 384-bit bus with 1.01 TB/s of bandwidth.

Q: Which GPU has more ray tracing cores?

A: The RTX 4090 D has 114 ray tracing cores, while the Radeon 840M has 4 ray tracing cores.

Q: What are the power requirements for each card?

A: The Radeon 840M has a 15 W TDP with no power connectors. The RTX 4090 D has a 425 W TDP with a single 16-pin power connector and a suggested power supply of 800 W.

Q: What is the production status of each GPU?

A: The Radeon 840M is listed as active, while the RTX 4090 D is marked as end-of-life.

Q: What benchmark scores does the RTX 4090 D have?

A: The RTX 4090 D scores 8,587 in 3DMark Steel Nomad DX12, 278,621 in Geekbench OpenCL, and 246,941 in Geekbench Vulkan. Its average benchmark score is 178,050.

Where Each One Wins

The RTX 4090 D wins in every recorded benchmark category. Its 3DMark Steel Nomad DX12 score of 8,587 places it in the 98th percentile of all GPUs. Its Geekbench OpenCL score of 278,621 and Vulkan score of 246,941 are both substantial compute numbers. The Radeon 840M has no recorded benchmark scores and zero wins in the head-to-head comparison.

The RTX 4090 D is the clear choice for any workload that involves heavy rendering, compute, or machine learning inference. Its 456 tensor cores and 114 ray tracing cores provide dedicated hardware for these tasks. The 24 GB of GDDR6X memory with 1.01 TB/s bandwidth supports large datasets and high-resolution textures. The triple-slot cooler and 425 W TDP indicate a card designed for sustained high load.

The Radeon 840M wins in the categories of power consumption and physical footprint. Its 15 W TDP is a fraction of the RTX 4090 D's 425 W. It is an IGP with no slot width, no power connectors, and no separate dimensions. It is designed for portable devices, as indicated by its display output listing of portable device dependent. For a thin-and-light laptop or a compact system where a discrete GPU cannot fit, the Radeon 840M is the only option that works.

The RTX 4090 D also wins on connectivity. It offers 1x HDMI 2.1 and 3x DisplayPort 1.4a outputs, while the Radeon 840M's outputs depend on the portable device it is integrated into. The PCIe 4.0 x16 interface on the NVIDIA card doubles the lane width of the AMD part's PCIe 4.0 x8 interface.

The production status favors the Radeon 840M in terms of availability. It is active, while the RTX 4090 D is end-of-life. However, the end-of-life status does not change the performance gap. The RTX 4090 D remains the dominant part in every measured metric, and its nearest rivals in the database are all NVIDIA data center or professional cards, not integrated graphics.