AMD Instinct MI325X vs NVIDIA GeForce RTX 4080 Max-Q Comparison

Where Each One Wins

The AMD Instinct MI325X and the NVIDIA GeForce RTX 4080 Max-Q occupy entirely different segments of the GPU landscape, and their benchmark profiles reflect that divergence. The MI325X is a data center accelerator built for compute throughput, while the RTX 4080 Max-Q is a mobile graphics processor designed for portable systems. The recorded data shows zero direct head-to-head benchmarks between the two, but the architectural specifications alone establish clear use-case separation.

The MI325X wins decisively in raw compute throughput, memory capacity, and memory bandwidth. Its FP32 performance of 81.72 TFLOPS dwarfs the RTX 4080 Max-Q's 20.04 TFLOPS, making it the clear choice for workloads that scale with floating-point operations, such as large-scale scientific simulations, AI training, and high-performance computing. The 256 GB HBM3e memory with 6.14 TB/s of bandwidth is in a different class entirely from the 12 GB GDDR6 with 432.0 GB/s, meaning the MI325X can hold vastly larger datasets on-die and feed them to the compute units at dramatically higher rates.

The RTX 4080 Max-Q wins in every category related to graphics rendering and client-side operation. It has 80 ROPs producing 108.0 GPixel/s, while the MI325X has zero ROPs and a pixel rate of 0 MPixel/s. The NVIDIA part supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, whereas the AMD accelerator exposes no graphics APIs at all. The RTX 4080 Max-Q also includes 58 ray tracing cores and 232 tensor cores, features that are absent from the MI325X specification. The NVIDIA GPU is an IGP with portable device dependent display outputs; the MI325X has no display outputs whatsoever.

The MI325X's 19456 shading units and 1216 TMUs deliver a texture rate of 2,553.6 GTexel/s, versus 7424 shading units, 232 TMUs, and 313.2 GTexel/s for the RTX 4080 Max-Q. For compute-heavy tasks, the AMD part is vastly superior; for any task involving rasterization, ray tracing, or real-time rendering, the NVIDIA part is the only one of the two that can function.

Architecture Differences

The two GPUs implement fundamentally different architectures on the same 5 nm TSMC process node, but with vastly different scales. The MI325X uses the Aqua Vanjaram chip based on CDNA 3.0, AMD's compute-optimized architecture. The RTX 4080 Max-Q uses the AD104 chip based on Ada Lovelace, NVIDIA's graphics-focused architecture.

The physical dimensions tell the story. The MI325X die measures 1017 mm² with 153,000 million transistors, yielding a density of 150.4M transistors per mm². The RTX 4080 Max-Q die measures 294 mm² with 35,800 million transistors, yielding 121.8M transistors per mm². The AMD chip is more than three times larger and packs more than four times the transistor count.

Clock speeds differ substantially. The MI325X runs at a base clock of 1000 MHz with a boost of 2100 MHz. The RTX 4080 Max-Q runs at 795 MHz base and 1350 MHz boost. Memory clocks also diverge: the MI325X uses 1500 MHz (6 Gbps effective) HBM3e, while the RTX 4080 Max-Q uses 2250 MHz (18 Gbps effective) GDDR6.

The memory subsystems are architecturally incompatible. The MI325X uses an 8192-bit bus with HBM3e, while the RTX 4080 Max-Q uses a 192-bit bus with GDDR6. The AMD part's memory bandwidth of 6.14 TB/s is 14 times higher than the NVIDIA part's 432.0 GB/s.

The MI325X has no RT cores, no tensor cores, no ROPs, and no graphics API support. The RTX 4080 Max-Q has 58 RT cores and 232 tensor cores, plus full DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support. The MI325X connects via PCIe 5.0 x16, while the RTX 4080 Max-Q uses PCIe 4.0 x16. Power delivery also differs: the MI325X has a TDP of 1000 W with a suggested PSU of 1400 W, versus a 60 W TDP for the RTX 4080 Max-Q with no suggested PSU listed.

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark results between the AMD Instinct MI325X and the NVIDIA GeForce RTX 4080 Max-Q. Both parts have empty benchmark arrays, zero wins each, and no nearest rivals listed. The percentile versus all GPUs is 50 for both, and the average benchmark score is 0 for both.

Despite the absence of measured comparisons, the specification data permits a direct arithmetic comparison of theoretical peak performance. The MI325X delivers 81.72 TFLOPS of FP32 compute, which is 4.08 times the 20.04 TFLOPS of the RTX 4080 Max-Q. That is a 308% advantage in raw floating-point throughput.

In texture throughput, the MI325X achieves 2,553.6 GTexel/s against 313.2 GTexel/s for the RTX 4080 Max-Q, a factor of 8.15. The pixel rate comparison is stark: the MI325X produces 0 MPixel/s while the RTX 4080 Max-Q produces 108.0 GPixel/s. The NVIDIA part has an infinite advantage in rasterization because the AMD part cannot rasterize at all.

Memory bandwidth shows the largest absolute gap. The MI325X's 6.14 TB/s is 14.2 times the RTX 4080 Max-Q's 432.0 GB/s. Memory capacity differs by a factor of 21.3: 256 GB versus 12 GB.

The RTX 4080 Max-Q has a 58 RT cores advantage (58 versus none) and a 232 tensor cores advantage (232 versus none). It also has 80 ROPs versus zero, a 192-bit memory bus versus 8192-bit, and support for three graphics APIs versus none.

The TDP difference is 940 W in favor of the MI325X being more power-hungry, but that is expected given its role as a 1000 W OAM module versus a 60 W mobile IGP. The MI325X requires a 1400 W suggested PSU; the RTX 4080 Max-Q lists no PSU requirement.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI325X delivers 81.72 TFLOPS of FP32 compute, which is 4.08 times the 20.04 TFLOPS of the NVIDIA GeForce RTX 4080 Max-Q.

Q: Can the AMD Instinct MI325X render graphics?

A: No. The MI325X has zero ROPs, a pixel rate of 0 MPixel/s, no graphics API support (DirectX, OpenGL, and Vulkan are all listed as N/A), and no display outputs.

Q: How much memory does each GPU have, and what type?

A: The MI325X has 256 GB of HBM3e memory on an 8192-bit bus with 6.14 TB/s bandwidth. The RTX 4080 Max-Q has 12 GB of GDDR6 memory on a 192-bit bus with 432.0 GB/s bandwidth.

Q: Which GPU supports ray tracing and tensor operations?

A: Only the NVIDIA GeForce RTX 4080 Max-Q supports these features, with 58 RT cores and 232 tensor cores. The AMD Instinct MI325X lists no RT cores and no tensor cores.

Q: What are the power requirements for each GPU?

A: The MI325X has a TDP of 1000 W and a suggested PSU of 1400 W. The RTX 4080 Max-Q has a TDP of 60 W and no suggested PSU listed.

Q: What process node and foundry do both GPUs use?

A: Both use a 5 nm process from TSMC. The MI325X has a die size of 1017 mm² with 153,000 million transistors, while the RTX 4080 Max-Q has a die size of 294 mm² with 35,800 million transistors.

Specification Differences

The two GPUs differ in nearly every recorded specification field. The table below lists only the fields where the two parts differ.

| Field | AMD Instinct MI325X | NVIDIA GeForce RTX 4080 Max-Q |

|---|---|---|

| Series | None | GeForce 40-series |

| Chip | Aqua Vanjaram | AD104 |

| Architecture | CDNA 3.0 | Ada Lovelace |

| Generation | Instinct (MIx) | GeForce 40 Mobile |

| Transistors | 153,000 million | 35,800 million |

| Die Size | 1017 mm² | 294 mm² |

| Transistor Density | 150.4M / mm² | 121.8M / mm² |

| Base Clock | 1000 MHz | 795 MHz |

| Boost Clock | 2100 MHz | 1350 MHz |

| Memory Clock | 1500 MHz, 6 Gbps effective | 2250 MHz, 18 Gbps effective |

| Memory Size | 256 GB | 12 GB |

| Memory Type | HBM3e | GDDR6 |

| Memory Bus Width | 8192 bit | 192 bit |

| Memory Bandwidth | 6.14 TB/s | 432.0 GB/s |

| Shading Units | 19456 | 7424 |

| TMUs | 1216 | 232 |

| ROPs | 0 | 80 |

| RT Cores | None | 58 |

| Tensor Cores | None | 232 |

| Pixel Rate | 0 MPixel/s | 108.0 GPixel/s |

| Texture Rate | 2,553.6 GTexel/s | 313.2 GTexel/s |

| FP32 | 81.72 TFLOPS | 20.04 TFLOPS |

| FP16 | 81.72 TFLOPS (1:1) | 20.04 TFLOPS (1:1) |

| TDP | 1000 W | 60 W |

| Slot Width | OAM Module | IGP |

| Suggested PSU | 1400 W | None |

| Bus Interface | PCIe 5.0 x16 | PCIe 4.0 x16 |

| Display Outputs | No outputs | Portable Device Dependent |

| DirectX | N/A | 12 Ultimate (12_2) |

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Production Status | None listed | Active |

| Release Date | 2024-10-09 | 2023-01-02 |

| Predecessor | Radeon Instinct | GeForce 30 Mobile |

| Successor | None | GeForce 50 Mobile |

Both parts share the 5 nm TSMC process node, a 1:1 FP16 to FP32 ratio, no power connectors (the MI325X lists "None" and the RTX 4080 Max-Q also lists "None"), and no dimensions or launch MSRP in the database. Both have a percentile versus all GPUs of 50 and an average benchmark score of 0, with no nearest rivals recorded.