AMD Instinct MI455X vs NVIDIA GeForce RTX 5070 SUPER Comparison

The AMD Instinct MI455X and NVIDIA GeForce RTX 5070 SUPER are fundamentally different tools. The MI455X is a compute accelerator with a 50th percentile ranking across all GPUs, while the RTX 5070 SUPER holds an 18th percentile position. For anyone needing general-purpose graphics, display output, and standard API support, the RTX 5070 SUPER is the only functional option. For massive parallel compute workloads that fit within a single accelerator, the MI455X provides vastly higher raw throughput. The data indicates the RTX 5070 SUPER is the practical choice for a desktop workstation or gaming system, whereas the MI455X serves a specialized compute role where its 2300 W power draw and lack of display outputs are acceptable.

FAQ

Q: Which card has more memory bandwidth?

A: The AMD Instinct MI455X has 23.3 TB/s of bandwidth, which is over 34 times the 672.0 GB/s provided by the NVIDIA GeForce RTX 5070 SUPER.

Q: Do both cards support modern graphics APIs?

A: No. The RTX 5070 SUPER supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI455X reports N/A for DirectX, OpenGL, and Vulkan, meaning it lacks standard graphics API support.

Q: What is the difference in shading units?

A: The MI455X has 32,768 shading units, while the RTX 5070 SUPER has 6,400 shading units. This is a 5.12x difference in favor of the AMD part.

Q: Which card uses a newer PCIe interface?

A: The MI455X uses PCIe 6.0 x16, while the RTX 5070 SUPER uses PCIe 5.0 x16.

Q: What are the memory types and capacities?

A: The MI455X uses 432 GB of HBM4 on a 24576-bit bus. The RTX 5070 SUPER uses 18 GB of GDDR7 on a 192-bit bus.

Q: Which card has a higher boost clock?

A: The RTX 5070 SUPER has a boost clock of 2512 MHz, which is higher than the MI455X's 2400 MHz boost clock.

Architecture Differences

The AMD Instinct MI455X is built on the CDNA 5.0 architecture, which is designed specifically for compute workloads rather than graphics rendering. It uses a 2 nm process at TSMC and packs 320,000 million transistors onto a massive 2990 mm² die. Its transistor density is 107.0M per mm². This architecture prioritizes raw compute throughput over rasterization, which is evident in its 0 ROPS and 0 MPixel/s pixel rate. The chip is designated as MI450 256CU, indicating a large compute unit count. It belongs to the Instinct (MIx) generation and has a predecessor listed as Radeon Instinct.

The NVIDIA GeForce RTX 5070 SUPER uses the Blackwell 2.0 architecture, built on a 5 nm process at TSMC. It has 31,100 million transistors on a 263 mm² die, resulting in a higher transistor density of 118.3M per mm². This architecture includes dedicated RT cores (50) and tensor cores (200), enabling hardware-accelerated ray tracing and AI features. It is a full graphics processor with 80 ROPS and a 201.0 GPixel/s pixel rate. The chip is designated as GB205 and belongs to the GeForce 50 generation. Its production status is Active, whereas the MI455X has no production status listed.

The MI455X offers no display outputs, while the RTX 5070 SUPER provides 1x HDMI 2.1b and 3x DisplayPort 2.1b. The API support also differs sharply: the MI455X has no DirectX, OpenGL, or Vulkan support, while the RTX 5070 SUPER supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. These differences confirm that the MI455X is not a graphics card in the conventional sense, but a compute accelerator that operates without a graphical interface.

Specification Differences

The two cards differ across nearly every measured specification. The MI455X has a base clock of 1000 MHz and a boost clock of 2400 MHz, while the RTX 5070 SUPER has a base clock of 2325 MHz and a boost clock of 2512 MHz. Memory clocks also differ: the MI455X runs at 1900 MHz (7.6 Gbps effective) while the RTX 5070 SUPER runs at 1750 MHz (28 Gbps effective).

Memory capacity and type are major differentiators. The MI455X has 432 GB of HBM4 on a 24576-bit bus, versus the RTX 5070 SUPER's 18 GB of GDDR7 on a 192-bit bus. Bandwidth figures are 23.3 TB/s for the MI455X and 672.0 GB/s for the RTX 5070 SUPER. The shading unit count is 32,768 for the MI455X and 6,400 for the RTX 5070 SUPER. Texture mapping units are 1,024 versus 200, and the MI455X has 0 ROPs while the RTX 5070 SUPER has 80.

Texture rate for the MI455X is 2,457.6 GTexel/s, compared to 502.4 GTexel/s for the RTX 5070 SUPER. FP32 performance is 157.3 TFLOPS for the MI455X and 32.15 TFLOPS for the RTX 5070 SUPER, with both showing 1:1 FP16 ratios. Power consumption differs substantially: the MI455X has a TDP of 2300 W with a suggested PSU of 2700 W, while the RTX 5070 SUPER has a TDP of 275 W and no suggested PSU listed.

The MI455X is an EAM Module with no power connectors, while the RTX 5070 SUPER is a dual-slot card with a 1x 16-pin connector. Bus interfaces are PCIe 6.0 x16 for the MI455X and PCIe 5.0 x16 for the RTX 5070 SUPER. Dimensions are only listed for the RTX 5070 SUPER: 245 mm length, 115 mm height, and 40 mm width. The release dates are December 31, 2025 for the NVIDIA card and July 22, 2026 for the AMD card.

Head-to-Head Benchmarks

Direct comparison data is limited because the MI455X has no recorded benchmark scores or average benchmark scores in the database. The RTX 5070 SUPER has a single recorded benchmark: a 3dmark_3dmark_steel_nomad_dx12 score of 2,690, with an average benchmark score of 2,690. The nearest rivals for the RTX 5070 SUPER in this test are the NVIDIA Quadro K1100M at 2,664 (1% lower), the NVIDIA GeForce GT 1030 at 2,662 (1.1% lower), the Intel Arc Pro B50 at 2,660 (1.1% lower), and the NVIDIA GeForce GT 440 at 2,645 (1.7% lower). This places the RTX 5070 SUPER narrowly ahead of these older or lower-tier parts.

The MI455X has zero head-to-head benchmark entries against the RTX 5070 SUPER, and the wins count shows 0 for both cards. Benchmark results indicate that the MI455X cannot be scored in the same graphics benchmarks because it lacks the required API support and display functionality. The RTX 5070 SUPER's score of 2,690 in the Steel Nomad DX12 test reflects its graphics rendering capabilities. Without a comparable score for the MI455X, the recorded data shows that head-to-head comparison is not possible through standard graphics benchmarks.

The MI455X's percentile rank of 50 across all GPUs is based on its compute-oriented profile, not on graphics benchmark performance. The RTX 5070 SUPER's percentile rank of 18 is derived from its actual benchmark score. The RTX 5070 SUPER's FP32 throughput of 32.15 TFLOPS is lower than the MI455X's 157.3 TFLOPS by a factor of 4.89, but this theoretical peak does not translate to graphics benchmark wins for the AMD part.

Where Each One Wins

The NVIDIA GeForce RTX 5070 SUPER wins in all scenarios involving standard graphics rendering. It has a working pixel rate of 201.0 GPixel/s, 80 ROPS, and full support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. Its display outputs (1x HDMI 2.1b, 3x DisplayPort 2.1b) make it suitable for connecting monitors. The RTX 5070 SUPER's 50 RT cores and 200 tensor cores provide hardware acceleration for ray tracing and AI workloads that require graphics APIs. Its 275 W TDP and dual-slot form factor with a 16-pin connector allow installation in a standard desktop system. Its 18 GB of GDDR7 memory and 672.0 GB/s bandwidth are sufficient for high-resolution gaming and workstation graphics tasks.

The AMD Instinct MI455X wins in raw compute throughput. Its FP32 performance of 157.3 TFLOPS is 4.89 times higher than the RTX 5070 SUPER's 32.15 TFLOPS. Texture rate is 2,457.6 GTexel/s versus 502.4 GTexel/s, a 4.89x advantage. Memory bandwidth of 23.3 TB/s exceeds the RTX 5070 SUPER by more than 34 times, which is critical for large dataset operations. The 432 GB HBM4 memory capacity is 24 times larger than the RTX 5070 SUPER's 18 GB. The 32,768 shading units provide massive parallel processing capability, and the PCIe 6.0 x16 interface offers newer connectivity.

The MI455X's wins apply only to compute environments that do not require graphics output or standard APIs. Its 2300 W TDP and EAM Module form factor with no power connectors indicate it is designed for server racks with dedicated power delivery. The RTX 5070 SUPER's wins apply to any desktop use case: gaming, content creation, or general GPU-accelerated applications. For a builder assembling a workstation, the RTX 5070 SUPER is the only viable choice because the MI455X cannot drive a display or run graphics APIs. For a data center deploying compute accelerators, the MI455X delivers superior raw numbers in every compute metric recorded.