AMD Instinct MI300X vs AMD Radeon 8040S Comparison

Head-to-Head Benchmarks

The benchmark data for the AMD Instinct MI300X and the AMD Radeon 8040S reflects two entirely different product categories, and direct comparisons require careful framing. The MI300X produces a Geekbench OpenCL score of 317,994, placing it in the 100th percentile of all GPUs in the database. The Radeon 8040S, by contrast, delivers a Passmark G3D score of 10,578 and an average benchmark score of 2,440 across its seven recorded tests, landing in the 17th percentile. These are not head-to-head runs but rather separate workloads that illustrate the scale of the performance gap.

The MI300X sits 7.5% above the NVIDIA L40S (which scores 295,763) and 10.7% above the NVIDIA RTX 6000 Ada Generation (287,237). It trails the NVIDIA B200 (345,482) by 8% and the NVIDIA H200 NVL (334,891) by 5%. The Radeon 8040S, on the other hand, is effectively tied with the NVIDIA GeForce 710M (2,433), sitting just 0.3% above it, and 0.6% above the Intel HD Graphics 610 (2,425). The 8040S also leads the NVIDIA GeForce GT 710M (2,422) by 0.7%, while the AMD Radeon RX 7400 (2,467) leads it by 1.1%. The MI300X's nearest rivals are all enterprise accelerators, whereas the 8040S competes in the entry-level integrated graphics space.

In raw compute terms, the MI300X delivers 81.72 TFLOPS of FP32 and FP16 performance at a 1:1 ratio. The Radeon 8040S delivers 5.734 TFLOPS in both FP32 and FP16, also at 1:1. The MI300X's texture rate reaches 2,553.6 GTexel/s while the 8040S produces 179.2 GTexel/s. The 8040S posts a pixel rate of 89.60 GPixel/s, while the MI300X records 0 MPixel/s. The MI300X has no display outputs and no raster output units, meaning its pixel rate is effectively zero. The 8040S, with 32 ROPs, handles rasterization tasks directly.

The MI300X's memory subsystem is a dedicated 192 GB of HBM3 across an 8192-bit bus, delivering 5.32 TB/s of bandwidth. The 8040S relies on system shared memory with a bus width and bandwidth marked as system dependent. This architectural distinction explains why the MI300X dominates memory-intensive workloads while the 8040S remains tethered to the host system's memory performance.

Architecture Differences

The MI300X uses the Aqua Vanjaram chip built on AMD's CDNA 3.0 architecture, fabricated on a 5 nm process at TSMC. It packs 153,000 million transistors onto a 1017 mm² die, giving a transistor density of 150.4 million transistors per square millimeter. The Radeon 8040S uses the Strix Halo chip with RDNA 3.5 architecture, fabricated on a 4 nm process also at TSMC. Its die measures 308 mm², and its transistor count is not recorded in the database.

The MI300X belongs to the Instinct (MIx) generation and is classified as an OAM Module with no power connectors and a 750 W TDP. The 8040S belongs to the Navi Mobile (RX 8000M) generation and is an IGP with a 55 W TDP. The MI300X has 19,456 shading units and 1,216 texture mapping units, with zero ROPs. The 8040S has 1,024 shading units, 64 TMUs, and 32 ROPs, plus 16 ray tracing cores. The MI300X does not list ray tracing cores or tensor cores in the database. The 8040S also lists no tensor cores.

Clock behavior differs significantly. The MI300X runs at a base clock of 1000 MHz and boosts to 2100 MHz, with memory at 1300 MHz (5.2 Gbps effective). The 8040S starts at 1295 MHz base and boosts to 2800 MHz, with system shared memory. The 8040S therefore runs at higher clock speeds but with far fewer execution units, which explains its lower aggregate throughput.

The API support gap is notable. The MI300X reports no DirectX, OpenGL, or Vulkan support, consistent with a compute-focused accelerator. The 8040S supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, making it a full-featured graphics solution. The MI300X offers no display outputs, while the 8040S's display outputs are portable device dependent. Both use PCIe 5.0 x16 as their bus interface.

The MI300X was released on December 5, 2023, and its predecessor is listed as Radeon Instinct. The 8040S was released on January 5, 2025, with Polaris Mobile as its predecessor. The 8040S is marked as active in production status, while the MI300X has no production status recorded. Neither product has a recorded launch MSRP in the database.

Where Each One Wins

The MI300X wins decisively in compute throughput, memory capacity, and memory bandwidth. Its 192 GB of HBM3 with 5.32 TB/s bandwidth serves large model inference and training workloads. The 81.72 TFLOPS FP32 and FP16 output is aimed at dense compute tasks. A texture rate of 2,553.6 GTexel/s indicates substantial fill rate capacity for compute-oriented shader work, even though the pixel rate is zero. The 100th percentile ranking means it outperforms essentially every other GPU in the database in its recorded OpenCL benchmark.

The Radeon 8040S wins in rasterization and graphics features. Its 89.60 GPixel/s pixel rate and 32 ROPs allow it to drive displays, which the MI300X cannot. The 16 ray tracing cores provide hardware acceleration for ray-traced scenes, a feature absent from the MI300X's specification. The 8040S also supports modern graphics APIs including DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. Its 55 W TDP is far lower than the MI300X's 750 W, making it suitable for portable devices, as indicated by its portable device dependent display outputs.

The 8040S's Passmark scores show a mixed profile. Its G2D score of 1,052 and G3D score of 10,578 indicate it handles 2D and 3D rendering tasks. The DirectX 9 score of 134 is the highest among its DirectX results, followed by DirectX 11 at 80, DirectX 10 at 48, and DirectX 12 at 47. The GPU compute score of 5,138 suggests moderate compute capability relative to its graphics scores. The MI300X has no equivalent rasterization metrics recorded, so a direct comparison on those axes is not possible.

The MI300X's closest rivals are all high-end data center parts, while the 8040S's rivals are entry-level integrated and discrete parts. That positioning alone indicates the intended use cases: the MI300X for accelerated compute clusters, the 8040S for thin-and-light laptops or compact systems where power draw and physical footprint matter more than raw throughput.

FAQ

Q: Which GPU has higher FP32 performance?

A: The AMD Instinct MI300X delivers 81.72 TFLOPS of FP32, while the AMD Radeon 8040S delivers 5.734 TFLOPS. Both run FP16 at the same figures with a 1:1 ratio.

Q: Does the MI300X support display output?

A: No. The MI300X records no display outputs and reports a pixel rate of 0 MPixel/s. The Radeon 8040S has display outputs marked as portable device dependent.

Q: What is the memory configuration of each GPU?

A: The MI300X uses 192 GB of HBM3 on an 8192-bit bus with 5.32 TB/s bandwidth. The Radeon 8040S uses system shared memory, with bus width, bandwidth, and capacity all dependent on the host system.

Q: How do the two compare in ray tracing support?

A: The Radeon 8040S includes 16 ray tracing cores. The MI300X does not list ray tracing cores in the database.

Q: What are the power requirements?

A: The MI300X has a 750 W TDP and a suggested power supply of 1150 W. The Radeon 8040S has a 55 W TDP and no suggested PSU recorded, consistent with an integrated graphics part.

Q: Which GPU supports more graphics APIs?

A: The Radeon 8040S supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI300X reports N/A for DirectX, OpenGL, and Vulkan.

Specification Differences

| Specification | AMD Instinct MI300X | AMD Radeon 8040S |

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

| Chip | Aqua Vanjaram | Strix Halo |

| Architecture | CDNA 3.0 | RDNA 3.5 |

| Generation | Instinct (MIx) | Navi Mobile (RX 8000M) |

| Process node | 5 nm | 4 nm |

| Die size | 1017 mm² | 308 mm² |

| Transistors | 153,000 million | unknown |

| Base clock | 1000 MHz | 1295 MHz |

| Boost clock | 2100 MHz | 2800 MHz |

| Memory | 192 GB HBM3 | System Shared |

| Memory bus | 8192 bit | System Shared |

| Memory bandwidth | 5.32 TB/s | System Dependent |

| Shading units | 19456 | 1024 |

| TMUs | 1216 | 64 |

| ROPs | 0 | 32 |

| Ray tracing cores | Not listed | 16 |

| Pixel rate | 0 MPixel/s | 89.60 GPixel/s |

| Texture rate | 2,553.6 GTexel/s | 179.2 GTexel/s |

| FP32 | 81.72 TFLOPS | 5.734 TFLOPS |

| FP16 | 81.72 TFLOPS (1:1) | 5.734 TFLOPS (1:1) |

| TDP | 750 W | 55 W |

| Slot width | OAM Module | IGP |

| Suggested PSU | 1150 W | Not listed |

| Display outputs | No outputs | Portable Device Dependent |

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

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Release date | 2023-12-05 | 2025-01-05 |

| Predecessor | Radeon Instinct | Polaris Mobile |

| Production status | Not listed | Active |

The two GPUs share a manufacturer, foundry (TSMC), and bus interface (PCIe 5.0 x16), but diverge on nearly every other recorded specification. The MI300X is a massive accelerator with a compute-first design, while the 8040S is a compact integrated part with full graphics capability. The 8040S's higher clocks and ray tracing support do not compensate for the MI300X's 19x advantage in shading units and 14x advantage in texture rate. The MI300X's 100th percentile benchmark ranking versus the 8040S's 17th percentile confirms the performance hierarchy.