AMD Instinct MI455X vs NVIDIA GeForce RTX 5070 Mobile Comparison

The Verdict

The database comparison between the AMD Instinct MI455X and the NVIDIA GeForce RTX 5070 Mobile presents two fundamentally different computing products. The MI455X is a server accelerator module with no display outputs, designed for compute workloads, while the RTX 5070 Mobile is an integrated graphics processor for portable devices. The recorded data shows the MI455X holds the advantage in raw compute specifications, offering 12 times the FP32 throughput of the RTX 5070 Mobile, but it does so at a power draw that is 46 times higher. The RTX 5070 Mobile, conversely, delivers a complete graphics feature set with DirectX 12 Ultimate support, 36 ray tracing cores, and 144 tensor cores, all within a 50 W envelope. The MI455X has no benchmark scores recorded in the database, while the RTX 5070 Mobile holds a 75th percentile ranking among all GPUs, with an average benchmark score of 29,928. For users requiring massive compute throughput for data center workloads, the MI455X is the clear choice. For portable gaming, content creation, or any task requiring display output and standard graphics APIs, the RTX 5070 Mobile is the only viable option in this pairing.

Architecture Differences

The AMD Instinct MI455X uses the CDNA 5.0 architecture with a chip designated MI450 256CU, built on a 2 nm process at TSMC. The NVIDIA GeForce RTX 5070 Mobile uses the Blackwell 2.0 architecture with a GB206 chip, also fabricated by TSMC but on a 5 nm process. The MI455X contains 320,000 million transistors on a 2990 mm² die, resulting in a transistor density of 107.0M per mm². The RTX 5070 Mobile contains 21,900 million transistors on a 181 mm² die, with a higher transistor density of 121.0M per mm². The MI455X has no ray tracing cores or tensor cores listed, while the RTX 5070 Mobile includes 36 ray tracing cores and 144 tensor cores. The MI455X supports no graphics APIs (DirectX, OpenGL, Vulkan all listed as N/A), whereas the RTX 5070 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI455X offers no display outputs, while the RTX 5070 Mobile provides outputs that are portable device dependent.

Head-to-Head Benchmarks

The database contains no head-to-head benchmark results between these two products, and the MI455X has no individual benchmark entries. The RTX 5070 Mobile, however, has nine recorded benchmark scores. In Geekbench OpenCL, it scores 122,238, and in Geekbench Vulkan, it scores 116,960. Passmark results show a DirectX 10 score of 129, DirectX 11 score of 192, DirectX 12 score of 93, and DirectX 9 score of 214. The Passmark G2D score is 896, while the G3D score is 20,355. The Passmark GPU compute score is 8,279. The RTX 5070 Mobile's average benchmark score of 29,928 places it 0.1 percent below the NVIDIA GeForce RTX 3070 Ti, which averages 29,945, and 0.5 percent above the NVIDIA GeForce RTX 2080 Ti, which averages 29,783. It also sits 0.6 percent below the AMD Radeon RX 6800 with its average of 30,095, and 1.7 percent below the AMD Radeon RX 6700 with its average of 30,433. The MI455X, with an average benchmark score of zero and a 50th percentile ranking, cannot be compared directly through measured results.

Specification Differences

The two products differ across nearly every recorded specification. The MI455X has a base clock of 1000 MHz and a boost clock of 2400 MHz, while the RTX 5070 Mobile has a base clock of 907 MHz and a boost clock of 1425 MHz. Memory speeds differ substantially: the MI455X uses 1900 MHz with 7.6 Gbps effective, and the RTX 5070 Mobile uses 1500 MHz with 24 Gbps effective. Memory capacity is 432 GB of HBM4 on a 24576-bit bus for the MI455X, compared to 8 GB of GDDR7 on a 128-bit bus for the RTX 5070 Mobile. Memory bandwidth is 23.3 TB/s for the MI455X versus 384.0 GB/s for the RTX 5070 Mobile. The MI455X has 32,768 shading units, 1,024 texture mapping units, and zero ROPs, with a pixel rate of 0 MPixel/s and a texture rate of 2,457.6 GTexel/s. The RTX 5070 Mobile has 4,608 shading units, 144 TMUs, and 48 ROPs, with a pixel rate of 68.40 GPixel/s and a texture rate of 205.2 GTexel/s. FP32 performance is 157.3 TFLOPS for the MI455X versus 13.13 TFLOPS for the RTX 5070 Mobile, with both offering a 1:1 FP16 ratio. Power consumption is 2300 W for the MI455X with a suggested PSU of 2700 W, while the RTX 5070 Mobile draws 50 W with no suggested PSU listed. The MI455X uses an EAM Module slot with PCIe 6.0 x16, while the RTX 5070 Mobile is an IGP with PCIe 5.0 x16. The MI455X has no power connectors, and the RTX 5070 Mobile also has none. The MI455X was released on 2026-07-22, while the RTX 5070 Mobile was released on 2025-04-14. The MI455X's predecessor is listed as Radeon Instinct, while the RTX 5070 Mobile's predecessor is GeForce 40 Mobile. The RTX 5070 Mobile has an active production status, while the MI455X has no production status recorded.

FAQ

Q: Which product has more FP32 compute power?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS of FP32 performance, which is 12 times the 13.13 TFLOPS offered by the NVIDIA GeForce RTX 5070 Mobile.

Q: What is the memory capacity and type for each product?

A: The MI455X has 432 GB of HBM4 memory on a 24576-bit bus with 23.3 TB/s bandwidth. The RTX 5070 Mobile has 8 GB of GDDR7 memory on a 128-bit bus with 384.0 GB/s bandwidth.

Q: Does the MI455X support ray tracing?

A: No, the MI455X has no ray tracing cores listed in the database. The RTX 5070 Mobile includes 36 ray tracing cores.

Q: How does the RTX 5070 Mobile compare to desktop GPUs in the database?

A: The RTX 5070 Mobile's average benchmark score of 29,928 is 0.1 percent below the RTX 3070 Ti, 0.5 percent above the RTX 2080 Ti, 0.6 percent below the RX 6800, and 1.7 percent below the RX 6700.

Q: Which product can be used with standard graphics APIs?

A: The RTX 5070 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI455X has no graphics API support listed.

Q: What is the power requirement difference?

A: The MI455X has a TDP of 2300 W and suggests a 2700 W power supply. The RTX 5070 Mobile has a TDP of 50 W with no suggested PSU listed.

Where Each One Wins

The AMD Instinct MI455X wins decisively in raw compute specifications. Its 157.3 TFLOPS FP32 throughput, 23.3 TB/s memory bandwidth, and 432 GB memory capacity position it for large-scale data center workloads. The 2 nm process node and 320,000 million transistor count support massive parallel computation, and the 2,457.6 GTexel/s texture rate indicates strong fill-rate capabilities for compute shaders. The MI455X also uses PCIe 6.0 x16, which offers higher bus bandwidth than the RTX 5070 Mobile's PCIe 5.0 x16.

The NVIDIA GeForce RTX 5070 Mobile wins in every area related to practical graphics and portability. Its 36 ray tracing cores and 144 tensor cores enable hardware-accelerated ray tracing and AI processing. The support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 means it can run standard graphics applications and games. The 8 GB of GDDR7 memory, while far smaller than the MI455X's capacity, is paired with a 128-bit bus and 384.0 GB/s bandwidth, which is adequate for its intended mobile use. The 50 W TDP makes it suitable for laptops, while the MI455X's 2300 W requirement demands dedicated infrastructure. The RTX 5070 Mobile has measurable benchmark results across nine tests, including a Passmark G3D score of 20,355 and a Geekbench OpenCL score of 122,238, confirming its real-world performance in supported environments. The MI455X has no recorded benchmark scores, so its practical performance remains unquantified in the database. The RTX 5070 Mobile also holds a 75th percentile ranking among all GPUs, compared to the MI455X's 50th percentile, indicating that the mobile GPU outperforms the majority of recorded GPUs in the database, while the accelerator sits at the median with no scores to support its position.