AMD Instinct MI455X vs NVIDIA GeForce RTX 5080 SUPER Comparison

AMD Instinct MI455X and NVIDIA GeForce RTX 5080 SUPER occupy different corners of the hardware landscape, and the recorded data reflects that separation clearly. The MI455X is a compute-oriented accelerator with a 2 nm process node and a 320,000 million transistor count on a 2990 mm² die, while the RTX 5080 SUPER is a graphics card built on a 5 nm node with 45,600 million transistors on a 378 mm² die. The benchmark database shows no shared test results between the two, and the head-to-head comparison table lists zero wins for either side, which means direct performance comparisons must rely on the individual specifications and the one available benchmark score for the RTX 5080 SUPER.

Head-to-Head Benchmarks

The database contains no head-to-head benchmark entries for these two products. The AMD Instinct MI455X has an empty benchmark array, an average benchmark score of zero, and a percentile ranking of 50 among all GPUs. The NVIDIA GeForce RTX 5080 SUPER has a single recorded benchmark result: a 3DMark Steel Nomad DX12 score of 3075. That score places it at the 19th percentile of all GPUs in the database. The nearest rivals for the RTX 5080 SUPER in that specific test include the NVIDIA Quadro P1000 with an average score of 3163, which is 2.8 percent higher, and the Intel Arc Pro B60 with an average score of 3182, which is 3.4 percent higher. On the lower side, the NVIDIA GeForce 820A scores 2983, which is 3.1 percent lower, and the NVIDIA GeForce GTX 860M scores 2967, which is 3.6 percent lower. The RTX 5080 SUPER sits between these two clusters, narrowly trailing the Quadro P1000 and Arc Pro B60 while leading the 820A and GTX 860M by a small margin.

Because the MI455X has no benchmark scores, the database cannot provide a direct numerical comparison between the two accelerators. The available data instead shows a contrast in raw compute specifications. The MI455X delivers 157.3 TFLOPS of FP32 performance and 157.3 TFLOPS of FP16 performance at a 1:1 ratio. The RTX 5080 SUPER delivers 56.28 TFLOPS of FP32 and 56.28 TFLOPS of FP16, also at a 1:1 ratio. The MI455X therefore offers approximately 2.8 times the FP32 throughput of the RTX 5080 SUPER based on the recorded figures. The MI455X also has a texture rate of 2,457.6 GTexel/s compared to 879.3 GTexel/s for the RTX 5080 SUPER, a difference of roughly 2.8 times. The pixel rate tells a different story: the MI455X is recorded at 0 MPixel/s, while the RTX 5080 SUPER reaches 293.1 GPixel/s. That indicates the MI455X has no rasterization output pipeline, which aligns with its compute-focused design.

Memory capacity and bandwidth also diverge sharply. The MI455X carries 432 GB of HBM4 memory on a 24576-bit bus, yielding 23.3 TB/s of bandwidth. The RTX 5080 SUPER has 24 GB of GDDR7 memory on a 256-bit bus, yielding 1.02 TB/s of bandwidth. The MI455X offers 18 times the memory capacity and roughly 22.8 times the memory bandwidth according to the recorded numbers. Clock speeds differ as well: the MI455X runs at a 1000 MHz base and 2400 MHz boost, while the RTX 5080 SUPER runs at 2295 MHz base and 2617 MHz boost. The RTX 5080 SUPER has higher clock frequencies, but the MI455X compensates with a much larger shader count: 32,768 shading units versus 10,752, and 1,024 texture mapping units versus 336.

The Verdict

The data points to two different purposes. The AMD Instinct MI455X is built for compute density. Its 432 GB memory pool, 23.3 TB/s bandwidth, 157.3 TFLOPS FP32 throughput, and 2,300 W TDP indicate a device designed for large-scale data processing, not for rendering to a display. It has no display outputs, no pixel rate, no DirectX, OpenGL, or Vulkan support, and its slot width is listed as an EAM Module with no power connectors. The NVIDIA GeForce RTX 5080 SUPER is a conventional graphics card with a dual-slot form factor, a 16-pin power connector, HDMI 2.1b and DisplayPort 2.1b outputs, and support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. Its 24 GB of GDDR7 memory and 1.02 TB/s bandwidth are substantial for a consumer card but small relative to the MI455X.

The RTX 5080 SUPER also has a recorded benchmark score of 3075 in 3DMark Steel Nomad DX12, placing it at the 19th percentile, with nearest rivals within roughly 3.6 percent either way. The MI455X has no recorded benchmark score, so its percentile of 50 is a default value rather than a measured result. The RTX 5080 SUPER has a launch MSRP of 999 USD, while the MI455X has no launch MSRP in the database. The production status for the RTX 5080 SUPER is listed as Active, while the MI455X has no production status recorded. The release dates show the RTX 5080 SUPER arriving on 2025-12-31 and the MI455X on 2026-07-22, making the MI455X the later product.

For a user who needs to render graphics, run DirectX or Vulkan workloads, or connect to a monitor, the RTX 5080 SUPER is the only option with the required features. For a user who needs massive memory capacity and raw FP32 compute with no display output, the MI455X is the clear choice based on the specification sheet. The absence of shared benchmarks means the database cannot declare a winner in direct competition; it can only confirm that the two products target different workloads.

Where Each One Wins

The MI455X wins on compute throughput. Its 157.3 TFLOPS FP32 and FP16 figures exceed the RTX 5080 SUPER's 56.28 TFLOPS in both precision formats. Its texture rate of 2,457.6 GTexel/s is nearly three times the RTX 5080 SUPER's 879.3 GTexel/s. Its memory subsystem is in a different class: 432 GB versus 24 GB, 24576-bit bus versus 256-bit, and 23.3 TB/s versus 1.02 TB/s. The MI455X also has more shading units (32,768 versus 10,752), more texture mapping units (1,024 versus 336), and a larger die (2990 mm² versus 378 mm²). Its 2 nm process node is smaller than the RTX 5080 SUPER's 5 nm node, and its transistor density of 107.0M per mm² is lower than the RTX 5080 SUPER's 120.6M per mm², but the total transistor count is much higher.

The RTX 5080 SUPER wins on graphics features and practical usability. It has 112 ROPs, 84 RT cores, and 336 tensor cores, none of which are listed for the MI455X. Its pixel rate of 293.1 GPixel/s is a real number, whereas the MI455X is recorded at 0 MPixel/s. The RTX 5080 SUPER supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the MI455X lists N/A for all three APIs. The RTX 5080 SUPER has four display outputs (one HDMI 2.1b and three DisplayPort 2.1b), while the MI455X has no outputs. The RTX 5080 SUPER also has higher clock speeds: 2295 MHz base and 2617 MHz boost, compared to 1000 MHz base and 2400 MHz boost for the MI455X. Its power draw of 415 W is far lower than the MI455X's 2300 W, and its dual-slot form factor with a 16-pin connector is far more standard than the MI455X's EAM Module with no connectors.

The RTX 5080 SUPER also has the only measured benchmark in the comparison. Its 3DMark Steel Nomad DX12 score of 3075, while modest relative to its nearest rivals, demonstrates real graphics performance. The MI455X has no such measurement. The RTX 5080 SUPER is also the only one with a production status of Active, a launch MSRP of 999 USD, and a defined physical footprint: 304 mm in length, 137 mm in height, and 40 mm in width. The MI455X has no dimensions listed.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS of FP32 performance, while the NVIDIA GeForce RTX 5080 SUPER delivers 56.28 TFLOPS. The MI455X is roughly 2.8 times faster in this metric.

Q: Does the AMD Instinct MI455X support DirectX or Vulkan?

A: No. The database lists DirectX, OpenGL, and Vulkan support as N/A for the MI455X. The RTX 5080 SUPER supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Q: What is the memory capacity difference?

A: The MI455X has 432 GB of HBM4 memory, while the RTX 5080 SUPER has 24 GB of GDDR7 memory. The MI455X also has a 24576-bit memory bus compared to the RTX 5080 SUPER's 256-bit bus.

Q: Does the RTX 5080 SUPER have a measured benchmark score?

A: Yes. The RTX 5080 SUPER has a 3DMark Steel Nomad DX12 score of 3075, which places it at the 19th percentile among all GPUs. Its nearest rivals are the NVIDIA Quadro P1000 at 3163 (2.8 percent higher) and the Intel Arc Pro B60 at 3182 (3.4 percent higher).

Q: Which card has display outputs?

A: Only the RTX 5080 SUPER has display outputs: one HDMI 2.1b and three DisplayPort 2.1b. The MI455X has no outputs.

Q: What is the TDP of each card?

A: The MI455X has a TDP of 2300 W, and the RTX 5080 SUPER has a TDP of 415 W. The MI455X also has a suggested PSU of 2700 W, while the RTX 5080 SUPER has no suggested PSU listed.

Architecture Differences

The two accelerators use fundamentally different architectures. The AMD Instinct MI455X is built on CDNA 5.0, a compute-focused design, while the NVIDIA GeForce RTX 5080 SUPER uses Blackwell 2.0, a graphics-oriented architecture. The MI455X chip is labeled MI450 256CU, indicating 256 compute units, which aligns with its 32,768 shading units. The RTX 5080 SUPER uses the GB203 chip with 10,752 shading units, 336 texture mapping units, and 112 ROPs. The MI455X has no ROPs listed, consistent with its lack of pixel output.

The process technology differs by two nodes: the MI455X is fabricated on a 2 nm process at TSMC, while the RTX 5080 SUPER uses a 5 nm process, also at TSMC. The transistor counts reflect the die size difference: 320,000 million transistors on a 2990 mm² die for the MI455X, versus 45,600 million transistors on a 378 mm² die for the RTX 5080 SUPER. The transistor density is higher on the RTX 5080 SUPER at 120.6M per mm², compared to 107.0M per mm² for the MI455X.

Memory architecture is another major split. The MI455X uses HBM4 with a 24576-bit bus and 23.3 TB/s bandwidth, while the RTX 5080 SUPER uses GDDR7 with a 256-bit bus and 1.02 TB/s bandwidth. The MI455X has 432 GB of memory, the RTX 5080 SUPER has 24 GB. The memory clock for the MI455X is 1900 MHz with 7.6 Gbps effective, while the RTX 5080 SUPER runs at 2000 MHz with 32 Gbps effective.

The RTX 5080 SUPER includes hardware features that the MI455X lacks: 84 RT cores for ray tracing and 336 tensor cores for AI acceleration. The MI455X lists no RT cores or tensor cores. The MI455X also has no pixel rate, while the RTX 5080 SUPER has 293.1 GPixel/s. The texture rate favors the MI455X at 2,457.6 GTexel/s versus 879.3 GTexel/s.

The interface and form factor also differ. The MI455X uses PCIe 6.0 x16, while the RTX 5080 SUPER uses PCIe 5.0 x16. The MI455X is an EAM Module with no power connectors, while the RTX 5080 SUPER is a dual-slot card with a 16-pin connector. The RTX 5080 SUPER has display outputs, the MI455X does not. The MI455X has a higher TDP at 2300 W, and the RTX 5080 SUPER has a lower TDP at 415 W. The RTX 5080 SUPER has a production status of Active, while the MI455X has none recorded. The RTX 5080 SUPER also has a launch MSRP of 999 USD, while the MI455X has no launch MSRP.