AMD Instinct MI300A vs AMD Radeon RX 7800M Comparison

Head-to-Head Benchmarks

The AMD Instinct MI300A and AMD Radeon RX 7800M occupy vastly different segments, and the recorded data reflects that divergence clearly. The MI300A carries zero benchmark entries in the database, with an average benchmark score of 0 and a percentile rank of 50 among all GPUs. The RX 7800M, by contrast, has ten recorded benchmark results, an average score of 27883, and sits at the 73rd percentile.

Because the MI300A has no benchmark scores, direct numerical comparison across identical tests is impossible. However, the RX 7800M’s individual results provide a reference point for what the database measures. Its highest single-test score comes from Geekbench Vulkan at 126668, followed by Geekbench OpenCL at 120778. In Passmark tests, the RX 7800M delivers a G3D score of 17613, a GPU compute score of 9342, and a G2D score of 892. DirectX 11 and DirectX 9 scores are 176 and 174 respectively, while DirectX 10 and DirectX 12 scores are 99 and 89. The 3DMark Steel Nomad DX12 test returns 2994.

The MI300A’s lack of recorded benchmarks means its nearest rivals list is empty, and the head-to-head benchmark array contains no entries. The RX 7800M, however, has a defined competitive set. Its nearest rival is the AMD Radeon Pro Vega 20 with an average score of 27839, placing the RX 7800M 0.2% ahead. The AMD Radeon Pro W5500X scores 27973, which puts the RX 7800M 0.3% behind. The NVIDIA GeForce GTX 980 Ti averages 28020, 0.5% ahead of the RX 7800M, and the AMD FirePro S7150 averages 28117, 0.8% ahead. These margins are narrow, indicating the RX 7800M clusters tightly with older workstation and high-end desktop parts in aggregate performance.

Architecture Differences

The two GPUs share a 5 nm process node and TSMC as the foundry, but almost everything else diverges. The MI300A uses the Aqua Vanjaram chip with CDNA 3.0 architecture, while the RX 7800M uses the Navi 32 chip with RDNA 3.0. The MI300A belongs to the Instinct (MIx) generation, whereas the RX 7800M is part of the Navi Mobile (RX 7000M) generation within the Radeon RX 7000 series.

Transistor counts differ by an order of magnitude. The MI300A packs 153,000 million transistors on a 1017 mm² die, yielding a transistor density of 150.4M per mm². The RX 7800M contains 28,100 million transistors on a 346 mm² die, with a density of 81.2M per mm². The MI300A’s die is nearly three times larger and holds over five times the transistor count.

Memory architecture is fundamentally different. The MI300A uses 128 GB of HBM3 on an 8192-bit bus, delivering 5.32 TB/s of bandwidth. The RX 7800M uses 12 GB of GDDR6 on a 192-bit bus, delivering 432.0 GB/s. The bandwidth gap is massive: the MI300A offers over twelve times the memory throughput. Memory clocks also differ, with the MI300A running at 1300 MHz (5.2 Gbps effective) and the RX 7800M at 2250 MHz (18 Gbps effective). The RX 7800M’s higher effective clock compensates for its narrower bus, but the MI300A’s sheer bus width dominates.

Shading resources differ substantially. The MI300A has 14592 shading units, 912 texture mapping units, and 0 ROPs, producing a pixel rate of 0 MPixel/s and a texture rate of 1,915.2 GTexel/s. The RX 7800M has 3840 shading units, 240 TMUs, 96 ROPs, and 60 ray tracing cores, producing a pixel rate of 224.2 GPixel/s and a texture rate of 560.4 GTexel/s. The MI300A’s FP32 throughput is 61.29 TFLOPS, while the RX 7800M delivers 35.87 TFLOPS. The RX 7800M reports FP16 at 35.87 TFLOPS (1:1), while the MI300A lists no FP16 figure.

Clock speeds favor the RX 7800M. Its base clock is 1295 MHz, boost is 2335 MHz, and game clock is 2145 MHz. The MI300A has a base clock of 1000 MHz and a boost of 2100 MHz, with no game clock listed.

Where Each One Wins

The MI300A wins decisively in raw compute throughput and memory capacity. Its FP32 performance of 61.29 TFLOPS exceeds the RX 7800M’s 35.87 TFLOPS by approximately 71%. Texture rate also favors the MI300A at 1,915.2 GTexel/s versus 560.4 GTexel/s. Memory bandwidth is the largest differential: 5.32 TB/s versus 432.0 GB/s, a roughly twelve-fold advantage. The 128 GB HBM3 pool dwarfs the 12 GB GDDR6 allocation, making the MI300A suited for workloads with massive datasets that cannot fit in smaller memory pools. Its 8192-bit bus allows sustained high-throughput access to that memory, which is critical for large matrix operations and data-parallel compute tasks.

The RX 7800M wins in areas that matter for graphics rendering and real-time interaction. It has 96 ROPs and a pixel rate of 224.2 GPixel/s, while the MI300A has zero ROPs and a pixel rate of 0 MPixel/s. The MI300A has no display outputs, while the RX 7800M’s display outputs are portable device dependent. The RX 7800M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, whereas the MI300A lists N/A for all three APIs. The RX 7800M also has 60 ray tracing cores, a feature absent from the MI300A’s specification. The RX 7800M’s boost clock of 2335 MHz is higher than the MI300A’s 2100 MHz, which helps in latency-sensitive graphics workloads.

The RX 7800M also wins on power efficiency. Its TDP is 180 W, and it requires no suggested PSU rating, while the MI300A has a TDP of 750 W and a suggested PSU of 1150 W. The RX 7800M is an IGP (integrated graphics processor) form factor, whereas the MI300A is an OAM module. The RX 7800M uses PCIe 4.0 x16, while the MI300A uses PCIe 5.0 x16.

In benchmark standings, only the RX 7800M has a presence. Its 73rd percentile rank places it above the majority of all GPUs in the database, and its nearest rivals are all within 1% of its average score. The MI300A’s 50th percentile with no benchmark data reflects a lack of recorded measurements rather than performance capability.

Specification Differences

| Specification | AMD Instinct MI300A | AMD Radeon RX 7800M |

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

| Architecture | CDNA 3.0 | RDNA 3.0 |

| Chip | Aqua Vanjaram | Navi 32 |

| Codename | None | Wheat Nas |

| Generation | Instinct (MIx) | Navi Mobile (RX 7000M) |

| Transistors | 153,000 million | 28,100 million |

| Die Size | 1017 mm² | 346 mm² |

| Transistor Density | 150.4M / mm² | 81.2M / mm² |

| Base Clock | 1000 MHz | 1295 MHz |

| Boost Clock | 2100 MHz | 2335 MHz |

| Game Clock | None | 2145 MHz |

| Memory Size | 128 GB | 12 GB |

| Memory Type | HBM3 | GDDR6 |

| Memory Bus Width | 8192 bit | 192 bit |

| Memory Bandwidth | 5.32 TB/s | 432.0 GB/s |

| Memory Clock | 1300 MHz, 5.2 Gbps effective | 2250 MHz, 18 Gbps effective |

| Shading Units | 14592 | 3840 |

| TMUs | 912 | 240 |

| ROPs | 0 | 96 |

| RT Cores | None | 60 |

| Pixel Rate | 0 MPixel/s | 224.2 GPixel/s |

| Texture Rate | 1,915.2 GTexel/s | 560.4 GTexel/s |

| FP32 | 61.29 TFLOPS | 35.87 TFLOPS |

| FP16 | None listed | 35.87 TFLOPS (1:1) |

| TDP | 750 W | 180 W |

| Slot Width | OAM Module | IGP |

| Power Connectors | None | None |

| Suggested PSU | 1150 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 | 2023-12-05 | 2024-09-10 |

| Predecessor | Radeon Instinct | Polaris Mobile |

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI300A delivers 61.29 TFLOPS FP32, while the AMD Radeon RX 7800M delivers 35.87 TFLOPS. The MI300A is roughly 71% higher in this metric.

Q: How do the memory bandwidth figures compare?

A: The MI300A provides 5.32 TB/s of bandwidth through 128 GB of HBM3 on an 8192-bit bus. The RX 7800M provides 432.0 GB/s through 12 GB of GDDR6 on a 192-bit bus. The MI300A’s bandwidth is over twelve times higher.

Q: Does the RX 7800M support ray tracing?

A: Yes. The RX 7800M includes 60 ray tracing cores. The MI300A lists no ray tracing cores in its specifications.

Q: What is the pixel rate difference?

A: The RX 7800M achieves a pixel rate of 224.2 GPixel/s with 96 ROPs. The MI300A has 0 ROPs and a pixel rate of 0 MPixel/s, meaning it is not designed for rasterized graphics output.

Q: Which GPU has a higher boost clock?

A: The RX 7800M boosts to 2335 MHz, while the MI300A boosts to 2100 MHz. The RX 7800M also has a base clock of 1295 MHz versus the MI300A’s 1000 MHz.

Q: What are the TDP requirements for each?

A: The MI300A has a TDP of 750 W and a suggested PSU of 1150 W. The RX 7800M has a TDP of 180 W and lists no suggested PSU. The RX 7800M also uses an IGP form factor, while the MI300A uses an OAM module.

Q: How does the RX 7800M rank against its nearest rivals?

A: The RX 7800M has an average benchmark score of 27883 and sits at the 73rd percentile. It is 0.2% ahead of the AMD Radeon Pro Vega 20, 0.3% behind the AMD Radeon Pro W5500X, 0.5% behind the NVIDIA GeForce GTX 980 Ti, and 0.8% behind the AMD FirePro S7150.