AMD Instinct MI455X vs NVIDIA GeForce RTX 5070 Comparison

The Verdict

The recorded data presents two entirely different compute products. The AMD Instinct MI455X is a massive accelerator designed for a single purpose, high-throughput compute without any display capabilities. The NVIDIA GeForce RTX 5070 is a conventional graphics card that delivers a broad range of rendering and compute features. The MI455X is defined by its enormous memory pool and raw throughput figures, while the RTX 5070 is defined by its complete feature set and active production status.

The MI455X shows a 50th percentile ranking against all GPUs in the database, with an average benchmark score of zero. This indicates it has no recorded benchmark results in the database. The RTX 5070 shows an 82nd percentile ranking, with an average benchmark score of 40,377. Its nearest rivals show it is essentially tied with the AMD Radeon Pro 580, which has an average score of 40,318 and a delta of 0.1%. The data confirms the RTX 5070 is a measured, functioning graphics product, while the MI455X is a specification-only entry at this time.

The choice between these two depends entirely on the workload. For any task requiring a display output, standard graphics APIs, or a conventional dual-slot card, the RTX 5070 is the only option that fits the recorded data. For tasks that demand an extraordinary 432 GB memory capacity and 23.3 TB/s of bandwidth, the MI455X is the clear direction, though its 2300 W TDP and lack of display outputs restrict its use to dedicated compute environments.

FAQ

Q: Do both cards support standard graphics APIs?

A: No. The NVIDIA GeForce RTX 5070 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The AMD Instinct MI455X lists N/A for DirectX, OpenGL, and Vulkan, meaning it does not expose these APIs in the recorded data.

Q: What is the memory capacity difference between the two?

A: The AMD Instinct MI455X has 432 GB of HBM4 memory on a 24576-bit bus, delivering 23.3 TB/s of bandwidth. The NVIDIA GeForce RTX 5070 has 12 GB of GDDR7 memory on a 192-bit bus, delivering 672.0 GB/s of bandwidth.

Q: Which card has a higher FP32 compute rating?

A: The AMD Instinct MI455X is rated at 157.3 TFLOPS FP32, while the NVIDIA GeForce RTX 5070 is rated at 30.87 TFLOPS FP32. The MI455X also delivers 157.3 TFLOPS FP16 with a 1:1 ratio, and the RTX 5070 delivers 30.87 TFLOPS FP16 with a 1:1 ratio.

Q: Do both cards have the same production status?

A: No. The NVIDIA GeForce RTX 5070 has an active production status with a release date of March 2025. The AMD Instinct MI455X has no recorded production status, with a release date of July 2026.

Q: Can the MI455X be used for gaming?

A: The recorded data shows no display outputs for the MI455X and no graphics API support. The RTX 5070 provides 1x HDMI 2.1b and 3x DisplayPort 2.1b outputs, plus full graphics API support, making it the only one of the two with the necessary features for gaming.

Architecture Differences

The AMD Instinct MI455X uses the CDNA 5.0 architecture and the MI450 256CU chip. It is fabricated on a 2 nm process at TSMC, with 320,000 million transistors on a 2990 mm² die. The transistor density is 107.0M per mm². This is a compute-oriented design with 32768 shading units and 1024 TMUs. It has zero ROPs and a pixel rate of 0 MPixel/s, confirming it is not designed for rasterized output. The texture rate is 2,457.6 GTexel/s. The MI455X uses HBM4 memory, a 24576-bit bus, and 432 GB of memory. It has no power connectors listed and uses an EAM Module slot width, which is a non-standard form factor. It connects via PCIe 6.0 x16. The card has no display outputs and no graphics API support, marking it as a pure compute accelerator.

The NVIDIA GeForce RTX 5070 uses the Blackwell 2.0 architecture and the GB205 chip. It is fabricated on a 5 nm process at TSMC, with 31,100 million transistors on a 263 mm² die. The transistor density is 118.3M per mm², which is higher than the MI455X despite the far smaller chip. The RTX 5070 has 6144 shading units, 192 TMUs, and 80 ROPs. It includes 48 RT cores and 192 tensor cores, which are features absent from the MI455X's recorded specifications. The pixel rate is 201.0 GPixel/s and the texture rate is 482.3 GTexel/s. It uses GDDR7 memory on a 192-bit bus with 12 GB capacity. It is a dual-slot card with a 1x 16-pin power connector and PCIe 5.0 x16 interface. It provides 1x HDMI 2.1b and 3x DisplayPort 2.1b outputs and full support for DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Specification Differences

The two cards differ in nearly every recorded specification field. The MI455X uses a 2 nm process, while the RTX 5070 uses a 5 nm process. The MI455X has 320,000 million transistors versus 31,100 million for the RTX 5070. The die size is 2990 mm² versus 263 mm². Transistor density favors the RTX 5070 at 118.3M per mm² versus 107.0M per mm² for the MI455X.

Clock speeds differ substantially. The MI455X has a base clock of 1000 MHz and a boost clock of 2400 MHz. The RTX 5070 has a base clock of 2325 MHz and a boost clock of 2512 MHz. Memory clocks are 1900 MHz at 7.6 Gbps effective for the MI455X and 1750 MHz at 28 Gbps effective for the RTX 5070.

The compute resources differ by a wide margin. The MI455X has 32768 shading units versus 6144 for the RTX 5070. TMUs are 1024 versus 192. The MI455X has 0 ROPs while the RTX 5070 has 80. The RTX 5070 has 48 RT cores and 192 tensor cores, while the MI455X lists null for both fields.

Memory configuration is a major split. The MI455X has 432 GB of HBM4 on a 24576-bit bus with 23.3 TB/s bandwidth. The RTX 5070 has 12 GB of GDDR7 on a 192-bit bus with 672.0 GB/s bandwidth.

Power requirements are vastly different. The MI455X has a 2300 W TDP and a suggested PSU of 2700 W. The RTX 5070 has a 250 W TDP and a suggested PSU of 600 W. The MI455X lists no power connectors, while the RTX 5070 uses a single 16-pin connector.

Form factor and interface also diverge. The MI455X uses an EAM Module slot width with PCIe 6.0 x16. The RTX 5070 is dual-slot with PCIe 5.0 x16 and dimensions of 245 mm length, 115 mm height, and 40 mm width. The MI455X has no recorded dimensions. The RTX 5070 has a launch MSRP of 549 USD. The MI455X has no launch MSRP recorded.

Head-to-Head Benchmarks

The head-to-head benchmark table contains no entries, and the wins count is zero for both cards. The MI455X has no recorded benchmark results at all. Its average benchmark score is zero, and its percentile ranking is 50th, which is based on its specification profile rather than measured performance.

The RTX 5070 has ten recorded benchmark results. Its strongest scores include 178,923 in Geekbench Vulkan and 172,660 in Geekbench OpenCL. In Passmark tests, it scores 29,137 in G3D and 15,787 in GPU Compute. The DirectX tests show 320 in DirectX 9, 277 in DirectX 11, 180 in DirectX 10, and 108 in DirectX 12. The 2D test shows 1,305. The RTX 5070's average benchmark score is 40,377, and its nearest rival is the AMD Radeon Pro 580 at 40,318, a delta of 0.1%. It also trails the AMD Radeon Pro 5300, which scores 40,870 with a delta of -1.2%, and leads the AMD Radeon Pro WX 7100 at 40,063 with a delta of 0.8% and the NVIDIA RTX A500 Mobile at 39,568 with a delta of 2%.

Because the MI455X has no benchmark scores, there is no measured comparison possible. The FP32 compute ratings, however, show a 5.1x difference in favor of the MI455X: 157.3 TFLOPS versus 30.87 TFLOPS. The texture rate is 2,457.6 GTexel/s versus 482.3 GTexel/s. The memory bandwidth is 23.3 TB/s versus 672.0 GB/s, a 34.7x difference in favor of the MI455X. The RTX 5070 counters with a pixel rate of 201.0 GPixel/s versus 0 MPixel/s for the MI455X, confirming the RTX 5070 is the only one capable of rasterized output.

Where Each One Wins

The AMD Instinct MI455X wins decisively in raw compute capacity. Its FP32 rating of 157.3 TFLOPS is more than five times the RTX 5070's 30.87 TFLOPS. Its memory subsystem is in a different class: 432 GB of HBM4 with 23.3 TB/s bandwidth versus 12 GB of GDDR7 with 672.0 GB/s. This makes it suited for workloads that require massive memory residency, such as large model training or data processing that cannot fit in conventional VRAM. The 2 nm process and 320,000 million transistors indicate a design scaled for maximum throughput per operation, and the 24576-bit memory bus provides the necessary data movement for that scale.

The NVIDIA GeForce RTX 5070 wins in every area of conventional graphics functionality. It has 80 ROPs and a pixel rate of 201.0 GPixel/s, while the MI455X has zero ROPs and zero pixel rate. It provides full DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support, plus 1x HDMI 2.1b and 3x DisplayPort 2.1b outputs. The MI455X has no display outputs and no API support. The RTX 5070 also includes 48 RT cores and 192 tensor cores, features that are absent from the MI455X's recorded data. Its 250 W TDP and 600 W suggested PSU make it compatible with standard dual-slot systems, whereas the MI455X requires 2300 W and an EAM Module form factor.

The RTX 5070 also wins on efficiency per watt in the recorded data. It delivers 30.87 TFLOPS FP32 at 250 W, while the MI455X delivers 157.3 TFLOPS at 2300 W. The RTX 5070 has a higher transistor density at 118.3M per mm² versus 107.0M per mm², and it is the only one of the two with an active production status and a measured average benchmark score of 40,377. The MI455X has a future release date of July 2026, while the RTX 5070 released in March 2025 and has a successor listed as GeForce 60.

For users with compute workloads that fit within the RTX 5070's capabilities, its measured results and complete feature set make it the practical choice. For workloads that require memory capacity and raw throughput beyond any conventional card, the MI455X's specifications point to a dedicated accelerator with no graphics functionality. The data does not show both cards competing for the same task. Each dominates the domain the other cannot enter.