AMD Instinct MI300A vs NVIDIA GeForce RTX 4090 Mobile Comparison

AMD Instinct MI300A and NVIDIA GeForce RTX 4090 Mobile occupy different corners of the hardware landscape. The MI300A is a data center accelerator built for massive compute throughput, while the RTX 4090 Mobile is a laptop GPU designed for portable rendering and general graphics. The recorded data shows no direct head-to-head benchmark scores for these two products, so the comparison relies on their respective specification sheets, measured performance records for the RTX 4090 Mobile, and architectural characteristics. The MI300A holds a clear advantage in raw compute and memory capacity, while the RTX 4090 Mobile delivers a full graphics feature set and established benchmark presence.

Head-to-Head Benchmarks

The database contains no overlapping benchmark scores for these two accelerators. The MI300A has no recorded benchmark entries, while the RTX 4090 Mobile has nine measured scores across OpenCL, Vulkan, DirectX, and compute workloads. This makes a direct performance comparison impossible from the recorded data. Instead, the RTX 4090 Mobile’s measured results provide a performance baseline, and the MI300A’s theoretical rates must be evaluated against that baseline with caution.

The RTX 4090 Mobile’s strongest recorded result is in Geekbench OpenCL, where it scores 180,831. Its Geekbench Vulkan score is 170,774, showing a smaller gap between the two API paths. In Passmark tests, the GPU scores 27,212 in G3D and 12,347 in GPU compute. The DirectX 9 score is 310, DirectX 11 is 262, DirectX 10 is 173, and DirectX 12 is 107. The G2D score is 984. These scores place the RTX 4090 Mobile in the 84th percentile of all GPUs in the database, with an average benchmark score of 43,667.

The nearest rivals for the RTX 4090 Mobile show a tight cluster. The NVIDIA Quadro M6000 has an average score of 43,301, which is 0.8% lower. The GeForce RTX 5050 Mobile scores 43,268, which is 0.9% lower. The Quadro M6000 24 GB scores 43,262, also 0.9% lower. The RTX A6000 scores 44,075, which is 0.9% higher. This indicates the RTX 4090 Mobile sits in a narrow performance band around 43,000 to 44,000 in average benchmark terms.

The MI300A’s FP32 rate of 61.29 TFLOPS and texture rate of 1,915.2 GTexel/s are substantially higher than the RTX 4090 Mobile’s 32.98 TFLOPS and 515.3 GTexel/s. The MI300A also has a memory bandwidth of 5.32 TB/s versus 576.0 GB/s for the RTX 4090 Mobile. However, these are theoretical figures, and the lack of measured benchmark scores for the MI300A prevents confirmation of real-world performance. The data shows the MI300A is designed for a different workload class, one where FP32 throughput and memory bandwidth dominate.

FAQ

Q: Which GPU has a higher FP32 compute throughput?

A: The AMD Instinct MI300A has an FP32 rate of 61.29 TFLOPS, while the NVIDIA GeForce RTX 4090 Mobile has 32.98 TFLOPS.

Q: What is the memory capacity difference between the two?

A: The MI300A has 128 GB of HBM3 memory, while the RTX 4090 Mobile has 16 GB of GDDR6 memory. The MI300A also has a wider 8192-bit bus versus the RTX 4090 Mobile’s 256-bit bus.

Q: Does the RTX 4090 Mobile support modern graphics APIs?

A: Yes, the RTX 4090 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI300A has no supported graphics APIs listed in the database.

Q: Which product has a higher memory bandwidth?

A: The MI300A has 5.32 TB/s of bandwidth, far above the RTX 4090 Mobile’s 576.0 GB/s.

Q: What is the process node for each chip?

A: Both use a 5 nm process from TSMC. The MI300A has 153,000 million transistors on a 1017 mm² die, while the RTX 4090 Mobile has 45,900 million transistors on a 379 mm² die.

Q: Does the RTX 4090 Mobile have ray tracing cores?

A: Yes, it has 76 ray tracing cores and 304 tensor cores. The MI300A has no ray tracing or tensor core counts listed.

Architecture Differences

The MI300A uses the CDNA 3.0 architecture and the Aqua Vanjaram chip, while the RTX 4090 Mobile uses Ada Lovelace with the AD103 chip. Both are fabricated on a 5 nm process at TSMC, but the die sizes differ substantially. The MI300A has a die size of 1017 mm² and contains 153,000 million transistors, resulting in a transistor density of 150.4 million per mm². The RTX 4090 Mobile has a 379 mm² die with 45,900 million transistors, for a density of 121.1 million per mm². The MI300A’s larger die and higher transistor count reflect its role as a data center accelerator.

The MI300A implements 14,592 shading units and 912 texture mapping units. It has no ROPs listed, no ray tracing cores, and no tensor cores, and its pixel rate is recorded as 0 MPixel/s. This is consistent with a compute-focused accelerator that lacks a traditional graphics pipeline. The RTX 4090 Mobile, by contrast, has 9,728 shading units, 304 TMUs, 112 ROPs, 76 ray tracing cores, and 304 tensor cores. Its pixel rate is 189.8 GPixel/s, and its texture rate is 515.3 GTexel/s.

Memory architecture also diverges. The MI300A uses 128 GB of HBM3 on an 8192-bit bus, with 5.32 TB/s bandwidth. The RTX 4090 Mobile uses 16 GB of GDDR6 on a 256-bit bus, with 576.0 GB/s. The MI300A’s memory clock is listed as 1300 MHz with 5.2 Gbps effective, while the RTX 4090 Mobile’s memory clock is 2250 MHz with 18 Gbps effective. The MI300A’s advantage in total bandwidth is massive, driven by the extremely wide bus.

The RTX 4090 Mobile supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The MI300A lists no API support, indicating it is not intended for consumer graphics workloads. The MI300A also has no display outputs, while the RTX 4090 Mobile’s outputs are listed as portable device dependent. The RTX 4090 Mobile is an integrated graphics processor (IGP) form factor, while the MI300A uses an OAM module.

Specification Differences

The two products differ in nearly every core specification. The MI300A has a base clock of 1000 MHz and a boost clock of 2100 MHz. The RTX 4090 Mobile has a base clock of 1335 MHz and a boost clock of 1695 MHz. The RTX 4090 Mobile has a higher base clock, but the MI300A has a higher boost clock.

Shading units: the MI300A has 14,592 versus 9,728 for the RTX 4090 Mobile. Texture mapping units: 912 versus 304. The MI300A has no ROPs, while the RTX 4090 Mobile has 112. The RTX 4090 Mobile also has 76 ray tracing cores and 304 tensor cores, both absent from the MI300A’s listing.

Memory size: 128 GB versus 16 GB. Memory type: HBM3 versus GDDR6. Bus width: 8192-bit versus 256-bit. Bandwidth: 5.32 TB/s versus 576.0 GB/s. The MI300A’s FP32 rate is 61.29 TFLOPS, while the RTX 4090 Mobile’s is 32.98 TFLOPS. The RTX 4090 Mobile’s FP16 rate is also 32.98 TFLOPS with a 1:1 ratio, while the MI300A has no FP16 figure listed.

Pixel rate: 0 MPixel/s for the MI300A versus 189.8 GPixel/s for the RTX 4090 Mobile. Texture rate: 1,915.2 GTexel/s versus 515.3 GTexel/s. The MI300A has a TDP of 750 W, while the RTX 4090 Mobile has a TDP of 120 W. The MI300A suggests an 1150 W power supply, while the RTX 4090 Mobile has no suggested PSU listed. The MI300A uses a PCIe 5.0 x16 interface, while the RTX 4090 Mobile uses PCIe 4.0 x16.

The MI300A has no display outputs, while the RTX 4090 Mobile has portable device dependent outputs. The MI300A has no API support listed, while the RTX 4090 Mobile supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The MI300A was released on 2023-12-05, while the RTX 4090 Mobile was released on 2023-01-02. The RTX 4090 Mobile is marked as active in production status, while the MI300A has no production status listed.

Where Each One Wins

The MI300A wins in raw compute throughput. Its FP32 rate of 61.29 TFLOPS is nearly double the RTX 4090 Mobile’s 32.98 TFLOPS. Its texture rate of 1,915.2 GTexel/s is more than three times the RTX 4090 Mobile’s 515.3 GTexel/s. Its memory bandwidth of 5.32 TB/s is over nine times the RTX 4090 Mobile’s 576.0 GB/s. The MI300A also has 128 GB of memory versus 16 GB, which allows much larger datasets to reside on-chip.

The RTX 4090 Mobile wins in graphics capability. It has 112 ROPs, 76 ray tracing cores, and 304 tensor cores, while the MI300A has none of these. The RTX 4090 Mobile supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the MI300A has no API support. The RTX 4090 Mobile has a pixel rate of 189.8 GPixel/s, while the MI300A is listed at 0 MPixel/s. The RTX 4090 Mobile also has a lower TDP of 120 W versus 750 W, making it suitable for portable systems.

The RTX 4090 Mobile also wins in measured benchmark presence. It has nine recorded scores, including an 84th percentile rank among all GPUs and an average benchmark score of 43,667. The MI300A has no recorded benchmark scores. The RTX 4090 Mobile’s nearest rivals are all within 0.9% of its average score, showing a competitive field. The MI300A has no nearest rivals listed.

Clock behavior differs as well. The RTX 4090 Mobile has a higher base clock at 1335 MHz versus 1000 MHz, but the MI300A boosts to 2100 MHz versus 1695 MHz. This suggests the MI300A can reach higher peak frequencies under load, while the RTX 4090 Mobile runs at a higher idle or low-load clock.

The Verdict

The data supports a clear split by workload. The AMD Instinct MI300A is built for compute-heavy tasks where FP32 throughput, texture rate, and memory bandwidth are the primary metrics. Its 61.29 TFLOPS FP32 rate, 1,915.2 GTexel/s texture rate, and 5.32 TB/s bandwidth place it in a different performance class than the RTX 4090 Mobile. Its 128 GB of HBM3 memory and 8192-bit bus are designed for large-scale data processing. The absence of display outputs, graphics APIs, and rendering hardware confirms that it is not a graphics card in the traditional sense.

The NVIDIA GeForce RTX 4090 Mobile is a complete graphics solution. It has ray tracing cores, tensor cores, ROPs, and full DirectX 12 Ultimate support. Its measured scores in Geekbench and Passmark show solid performance, with an 84th percentile ranking. Its 16 GB of GDDR6 memory and 576.0 GB/s bandwidth are far smaller than the MI300A’s, but they are paired with a 120 W TDP, making it feasible for laptop integration.

For users needing a portable device with graphics acceleration, the RTX 4090 Mobile is the only option with recorded support for standard rendering workloads. For users running data center compute tasks that demand maximum FP32 throughput and memory bandwidth, the MI300A is the stronger choice based on its specification sheet. The two products do not compete directly, and the recorded data provides no head-to-head benchmark results to bridge that gap. The MI300A leads in theoretical compute and memory metrics, while the RTX 4090 Mobile leads in graphics features and measured performance records.