AMD Instinct MI300X vs NVIDIA RTX 4000 Mobile Ada Generation Comparison

The Verdict

The AMD Instinct MI300X and NVIDIA RTX 4000 Mobile Ada Generation occupy opposite ends of the accelerator spectrum. The MI300X is a data center compute monster, ranked in the 100th percentile of all GPUs in the database, while the RTX 4000 Mobile is a mid-pack mobile part sitting at the 50th percentile. The MI300X delivers a Geekbench OpenCL score of 317,994, which is 10.7% ahead of the NVIDIA RTX 6000 Ada Generation and 7.5% ahead of the NVIDIA L40S. The RTX 4000 Mobile has no recorded benchmark score in the database, meaning direct numerical comparison is impossible, but its specifications place it firmly in the mobile workstation segment.

The MI300X is for compute environments requiring massive memory capacity and throughput. Its 192 GB of HBM3 memory with 5.32 TB/s bandwidth, combined with 19,456 shading units, makes it an accelerator for large-scale AI inference and high-performance computing workloads. The RTX 4000 Mobile is for portable workstations that need a balance of compute, graphics, and power efficiency. It carries 7,424 shading units, 58 RT cores, and 232 tensor cores, with 12 GB of GDDR6 memory, which suits 3D rendering, CUDA-accelerated applications, and mobile content creation.

The verdict is straightforward. The MI300X is the choice for server racks and dedicated compute nodes where 750 W power draw and the OAM Module form factor are acceptable. The RTX 4000 Mobile is the choice for laptops and compact mobile workstations, with a 110 W TDP and IGP slot width that allow integration into portable chassis. The data confirms the MI300X is a class-leading compute accelerator, while the RTX 4000 Mobile is a capable mobile graphics processor with no benchmark score recorded to challenge that positioning.

Architecture Differences

The MI300X uses AMD's CDNA 3.0 architecture, built on a 5 nm process at TSMC with the Aqua Vanjaram chip. It packs 153,000 million transistors onto a 1017 mm² die, resulting in a transistor density of 150.4M per mm². The RTX 4000 Mobile uses NVIDIA's Ada Lovelace architecture, also on a 5 nm TSMC process, with the AD104 chip containing 35,800 million transistors on a 294 mm² die. The density here is 121.8M per mm², lower than the MI300X.

The compute resources differ dramatically. The MI300X has 19,456 shading units and 1,216 texture mapping units, but zero ROPs and a pixel rate of 0 MPixel/s. This is a compute-only accelerator with no display outputs. The RTX 4000 Mobile has 7,424 shading units, 232 TMUs, and 80 ROPs, delivering 133.2 GPixel/s pixel fill rate and 386.3 GTexel/s texture rate. It also includes 58 RT cores and 232 tensor cores, hardware that the MI300X lacks entirely.

Memory architecture separates the two further. The MI300X uses HBM3 with a 8192-bit bus and 5.32 TB/s bandwidth, while the RTX 4000 Mobile uses GDDR6 on a 192-bit bus with 432.0 GB/s. The MI300X has no API support for DirectX, OpenGL, or Vulkan, confirming its role as a compute accelerator. The RTX 4000 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, making it a full graphics-capable processor. The MI300X runs at a 1000 MHz base clock and 2100 MHz boost, with memory at 1300 MHz (5.2 Gbps effective). The RTX 4000 Mobile runs at 1290 MHz base and 1665 MHz boost, with memory at 2250 MHz (18 Gbps effective).

Power and interface also diverge. The MI300X has a 750 W TDP with a suggested PSU of 1150 W, uses an OAM Module slot width, and connects via PCIe 5.0 x16. The RTX 4000 Mobile has a 110 W TDP, no suggested PSU, an IGP slot width, and PCIe 4.0 x16. The MI300X has no power connectors listed, and the RTX 4000 Mobile also lists none, with portable device dependent display outputs.

Head-to-Head Benchmarks

The head-to-head benchmark table in the database is empty, with zero wins recorded for either part. The MI300X has one Geekbench OpenCL score of 317,994, while the RTX 4000 Mobile has no benchmarks listed. The available comparison data instead comes from the MI300X's nearest rivals. The MI300X trails the NVIDIA H200 NVL by 5%, with the H200 scoring 334,891. It also trails the NVIDIA B200 by 8%, which scores 345,482. Against the NVIDIA L40S, the MI300X leads by 7.5%, and against the NVIDIA RTX 6000 Ada Generation, it leads by 10.7%.

The RTX 4000 Mobile has no nearest rivals listed and no average benchmark score, so its relative performance cannot be quantified from the database. What the data does show is that the MI300X sits in the 100th percentile of all GPUs, while the RTX 4000 Mobile sits in the 50th. The MI300X's single recorded benchmark places it among the fastest accelerators in the database, within 8% of the top-scoring B200. The RTX 4000 Mobile's lack of recorded scores means the database cannot confirm its competitive standing, but its mid-tier percentile ranking suggests it is neither a flagship nor an entry-level part.

Specification Differences

| Specification | AMD Instinct MI300X | NVIDIA RTX 4000 Mobile Ada Generation |

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

| Architecture | CDNA 3.0 | Ada Lovelace |

| Chip | Aqua Vanjaram | AD104 |

| 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 | 1290 MHz |

| Boost Clock | 2100 MHz | 1665 MHz |

| Memory Clock | 1300 MHz (5.2 Gbps effective) | 2250 MHz (18 Gbps effective) |

| Memory Size | 192 GB | 12 GB |

| Memory Type | HBM3 | GDDR6 |

| Memory Bus | 8192 bit | 192 bit |

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

| Shading Units | 19,456 | 7,424 |

| TMUs | 1,216 | 232 |

| ROPs | 0 | 80 |

| RT Cores | None | 58 |

| Tensor Cores | None | 232 |

| Pixel Rate | 0 MPixel/s | 133.2 GPixel/s |

| Texture Rate | 2,553.6 GTexel/s | 386.3 GTexel/s |

| FP32 | 81.72 TFLOPS | 24.72 TFLOPS |

| FP16 | 81.72 TFLOPS (1:1) | 24.72 TFLOPS (1:1) |

| TDP | 750 W | 110 W |

| Slot Width | OAM Module | IGP |

| 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 |

| Release Date | 2023-12-05 | 2023-03-20 |

| Production Status | Not listed | Active |

| Predecessor | Radeon Instinct | Ampere-MW |

| Successor | Not listed | Blackwell-MW |

FAQ

Q: Which GPU has more memory bandwidth?

A: The AMD Instinct MI300X has 5.32 TB/s bandwidth from its HBM3 memory on an 8192-bit bus. The NVIDIA RTX 4000 Mobile has 432.0 GB/s from GDDR6 on a 192-bit bus.

Q: Which GPU supports ray tracing?

A: Only the NVIDIA RTX 4000 Mobile supports ray tracing, with 58 RT cores. The AMD Instinct MI300X has no RT cores listed.

Q: What is the power draw difference?

A: The MI300X has a 750 W TDP, while the RTX 4000 Mobile has a 110 W TDP. The MI300X also lists a suggested PSU of 1150 W, while the RTX 4000 Mobile lists none.

Q: Can either GPU be used in a standard desktop PC?

A: The MI300X uses an OAM Module slot width and has no display outputs, making it unsuitable for desktop graphics use. The RTX 4000 Mobile uses an IGP slot width with portable device dependent display outputs, indicating it is designed for mobile integration.

Q: Which GPU has API support for gaming?

A: The RTX 4000 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI300X lists N/A for all three APIs, indicating no graphics API support.

Q: How does the MI300X compare to other NVIDIA data center parts?

A: The MI300X scores 317,994 in Geekbench OpenCL. It is 5% behind the NVIDIA H200 NVL (334,891) and 8% behind the NVIDIA B200 (345,482), but 7.5% ahead of the NVIDIA L40S (295,763) and 10.7% ahead of the NVIDIA RTX 6000 Ada Generation (287,237).

Where Each One Wins

The MI300X wins in raw compute throughput. Its FP32 performance of 81.72 TFLOPS is more than three times the RTX 4000 Mobile's 24.72 TFLOPS, and its FP16 performance matches at 81.72 TFLOPS versus 24.72 TFLOPS. The texture rate of 2,553.6 GTexel/s dwarfs the 386.3 GTexel/s of the mobile part. The MI300X also wins decisively in memory capacity and bandwidth, offering 192 GB at 5.32 TB/s versus 12 GB at 432.0 GB/s. For workloads that fit in GPU memory and demand massive throughput, such as large language model inference or scientific simulation, the MI300X is the clear choice.

The RTX 4000 Mobile wins in graphics capability and efficiency. It delivers 133.2 GPixel/s pixel rate and 80 ROPs, while the MI300X has zero ROPs and zero pixel rate. The RT core count of 58 and tensor core count of 232 enable ray tracing and AI-accelerated graphics features that the MI300X cannot perform. The 110 W TDP makes it suitable for battery-powered mobile workstations, while the MI300X requires 750 W and a dedicated OAM slot. The RTX 4000 Mobile also wins on API support, with DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, making it functional for graphics workloads.

The release timeline favors the RTX 4000 Mobile, which launched on 2023-03-20 and remains in active production. The MI300X launched later on 2023-12-05 with no production status listed. The RTX 4000 Mobile has a defined successor in Blackwell-MW, while the MI300X has no successor listed. The MI300X's predecessor is Radeon Instinct, and the RTX 4000 Mobile's predecessor is Ampere-MW. The MI300X uses PCIe 5.0 x16 versus the RTX 4000 Mobile's PCIe 4.0 x16, giving the AMD part a newer host interface. The database records the MI300X in the 100th percentile of all GPUs, while the RTX 4000 Mobile sits at the 50th percentile, reinforcing the compute-versus-mobility split.