AMD Instinct MI455X vs NVIDIA GeForce RTX 4050 Mobile Comparison

The Verdict

The AMD Instinct MI455X and the NVIDIA GeForce RTX 4050 Mobile occupy entirely different segments of the GPU landscape. The MI455X is a massive accelerator with an average benchmark score of zero, a 50th percentile ranking among all GPUs, and no recorded benchmark data in the database. It targets compute-heavy installations where raw throughput matters. The RTX 4050 Mobile, by contrast, is an active mobile graphics processor with a 63rd percentile ranking and an average benchmark score of 19,049 across nine recorded tests. The data shows no direct head-to-head wins for either part because no shared benchmark exists, so the verdict rests on their recorded specifications and the RTX 4050 Mobile's measurable results.

The MI455X fits deployments needing extreme memory capacity and bandwidth. Its 432 GB of HBM4 memory and 23.3 TB/s bandwidth are the standout figures. The RTX 4050 Mobile suits portable devices that require a full DirectX 12 Ultimate feature set. It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the MI455X reports N/A for all three APIs. For any conventional graphics workload, the RTX 4050 Mobile is the only viable choice because the MI455X has no display outputs and no graphics API support. For massive parallel compute tasks with enormous datasets, the MI455X is the clear pick based on its memory subsystem and FP32 throughput.

Where Each One Wins

The RTX 4050 Mobile wins every measurable interactive graphics category. Its pixel rate is 84.24 GPixel/s, its texture rate is 140.4 GTexel/s, and it records PassMark scores across DirectX 9, 10, 11, and 12. The MI455X reports a pixel rate of 0 MPixel/s and a texture rate of 2,457.6 GTexel/s, but with no raster output units and no display outputs, those rates cannot translate to visible frames. The RTX 4050 Mobile also has 20 RT cores and 80 tensor cores, making it the only part here with hardware support for ray tracing and AI acceleration.

The MI455X wins on raw compute scale. Its 157.3 TFLOPS FP32 and identical 157.3 TFLOPS FP16 (1:1) dwarf the RTX 4050 Mobile's 8.986 TFLOPS in both formats. The MI455X's 32,768 shading units and 1,024 texture mapping units far exceed the RTX 4050 Mobile's 2,560 and 80, respectively. The MI455X also leads in memory capacity, bus width, and bandwidth. The RTX 4050 Mobile has 6 GB of GDDR6 on a 96-bit bus with 192.0 GB/s bandwidth; the MI455X has 432 GB of HBM4 on a 24,576-bit bus with 23.3 TB/s bandwidth. In any memory-bound compute task that fits within the MI455X's resources, the data indicates a decisive advantage.

Architecture Differences

The MI455X uses AMD's CDNA 5.0 architecture on TSMC's 2 nm process. It contains 320,000 million transistors on a 2990 mm² die, yielding a transistor density of 107.0M per mm². The chip is designated MI450 256CU. Its base clock is 1000 MHz with a boost clock of 2400 MHz, and its memory runs at 1900 MHz with 7.6 Gbps effective speed. The MI455X belongs to the Instinct (MIx) generation, succeeds the Radeon Instinct line, and uses an EAM Module slot. It has no power connectors and no suggested PSU figure, though its TDP is listed at 2300 W.

The RTX 4050 Mobile uses NVIDIA's Ada Lovelace architecture on TSMC's 5 nm process. It contains 18,900 million transistors on a 159 mm² die, giving a transistor density of 118.9M per mm². The chip is AD107. Its base clock is 1455 MHz with a boost clock of 1755 MHz, and its memory runs at 2000 MHz with 16 Gbps effective speed. It belongs to the GeForce 40 Mobile generation, succeeds the GeForce 30 Mobile line, and is followed by the GeForce 50 Mobile. It uses an IGP slot format with no power connectors. The RTX 4050 Mobile's production status is Active; the MI455X has no production status listed.

The architectural split is clear. CDNA 5.0 is a compute-oriented design with no raster output units, no RT cores, and no tensor cores listed. Ada Lovelace is a full graphics architecture with 48 ROPs, 20 RT cores, and 80 tensor cores. The MI455X uses PCIe 6.0 x16 for connectivity, while the RTX 4050 Mobile uses PCIe 4.0 x8. The MI455X has no display outputs; the RTX 4050 Mobile's display outputs are portable device dependent.

FAQ

Q: Which GPU has more memory bandwidth?

A: The AMD Instinct MI455X has 23.3 TB/s of bandwidth, which is vastly higher than the NVIDIA GeForce RTX 4050 Mobile's 192.0 GB/s.

Q: Does the AMD Instinct MI455X support ray tracing?

A: No RT core count is listed for the MI455X. The NVIDIA GeForce RTX 4050 Mobile has 20 RT cores and supports DirectX 12 Ultimate (12_2).

Q: Which GPU is better for a laptop?

A: The NVIDIA GeForce RTX 4050 Mobile is designed for portability with a 50 W TDP and portable device dependent display outputs. The AMD Instinct MI455X has a 2300 W TDP, uses an EAM Module slot, and has no display outputs.

Q: What is the average benchmark score for each GPU?

A: The NVIDIA GeForce RTX 4050 Mobile has an average benchmark score of 19,049. The AMD Instinct MI455X has an average benchmark score of 0, with no benchmark entries recorded.

Q: How do their FP32 compute performances compare?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS FP32. The NVIDIA GeForce RTX 4050 Mobile delivers 8.986 TFLOPS FP32.

Q: Which GPU has a higher transistor density?

A: The NVIDIA GeForce RTX 4050 Mobile has a higher density at 118.9M transistors per mm², compared to the AMD Instinct MI455X at 107.0M per mm², despite the MI455X having far more total transistors.

Head-to-Head Benchmarks

The database contains no head-to-head benchmark entries between these two GPUs. The MI455X has no benchmarks at all, so every comparison must be drawn from the RTX 4050 Mobile's recorded results and the MI455X's specification sheet.

The MI455X's FP32 throughput of 157.3 TFLOPS is roughly 17.5 times the RTX 4050 Mobile's 8.986 TFLOPS. The texture rate difference is similarly lopsided: 2,457.6 GTexel/s versus 140.4 GTexel/s. Memory bandwidth is the largest gap, with the MI455X's 23.3 TB/s exceeding the RTX 4050 Mobile's 192.0 GB/s by over 120 times. The MI455X's 432 GB capacity is 72 times the RTX 4050 Mobile's 6 GB.

The RTX 4050 Mobile wins in areas tied to actual graphics output. Its pixel rate of 84.24 GPixel/s compares to the MI455X's 0 MPixel/s. The RTX 4050 Mobile records PassMark scores of 184 in DirectX 9, 79 in DirectX 10, 130 in DirectX 11, and 61 in DirectX 12. It also posts 633 in PassMark G2D, 14,423 in PassMark G3D, and 5,947 in PassMark GPU Compute. In Geekbench, it scores 74,748 in OpenCL and 75,235 in Vulkan. The MI455X has no equivalent entries.

The RTX 4050 Mobile's nearest rivals in the database show its competitive position. The AMD Radeon RX 6600 scores 19,036, a 0.1 percent difference. The NVIDIA Quadro K6000 scores 19,030, also 0.1 percent. The NVIDIA Tesla K20m scores 19,089, placing it 0.2 percent ahead of the RTX 4050 Mobile. The NVIDIA RTX 2000 Ada Generation scores 18,954, which is 0.5 percent behind. These results place the RTX 4050 Mobile squarely in a cluster of mid-range performers. The MI455X has no nearest rivals listed.

Specification Differences

The two GPUs differ in nearly every recorded field. The MI455X uses a 2 nm TSMC process; the RTX 4050 Mobile uses 5 nm TSMC. Transistor counts are 320,000 million versus 18,900 million. Die size is 2990 mm² versus 159 mm². Base clocks are 1000 MHz versus 1455 MHz, and boost clocks are 2400 MHz versus 1755 MHz. Memory clocks are 1900 MHz with 7.6 Gbps effective versus 2000 MHz with 16 Gbps effective.

Memory configurations diverge completely. The MI455X has 432 GB of HBM4 on a 24,576-bit bus with 23.3 TB/s bandwidth. The RTX 4050 Mobile has 6 GB of GDDR6 on a 96-bit bus with 192.0 GB/s bandwidth. Shading units number 32,768 versus 2,560. TMUs are 1,024 versus 80. ROPs are 0 versus 48. The RTX 4050 Mobile has 20 RT cores and 80 tensor cores; the MI455X lists none. Pixel rates are 0 MPixel/s versus 84.24 GPixel/s. Texture rates are 2,457.6 GTexel/s versus 140.4 GTexel/s. FP32 and FP16 are both 157.3 TFLOPS on the MI455X versus 8.986 TFLOPS on the RTX 4050 Mobile.

Power and form factor differ sharply. TDP is 2300 W for the MI455X and 50 W for the RTX 4050 Mobile. The MI455X uses an EAM Module slot; the RTX 4050 Mobile uses IGP. Both have no power connectors. The MI455X suggests a 2700 W PSU; the RTX 4050 Mobile has no suggested PSU. Bus interfaces are PCIe 6.0 x16 versus PCIe 4.0 x8. Display outputs are absent on the MI455X and portable device dependent on the RTX 4050 Mobile. API support is N/A for the MI455X across DirectX, OpenGL, and Vulkan, while the RTX 4050 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Release dates are July 22, 2026 for the MI455X and January 2, 2023 for the RTX 4050 Mobile.