AMD Instinct MI300 vs NVIDIA GeForce RTX 4090 Mobile Comparison

The Verdict

The recorded data presents two fundamentally different compute devices that share a release window but serve entirely distinct roles. The AMD Instinct MI300 is a data center accelerator with no display outputs and no graphics API support, while the NVIDIA GeForce RTX 4090 Mobile is an integrated graphics processor for portable devices with full DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support. The MI300 carries 128 GB of HBM3 memory across an 8192-bit bus, delivering 5.32 TB/s of bandwidth, while the RTX 4090 Mobile uses 16 GB of GDDR6 on a 256-bit bus with 576.0 GB/s. The MI300 draws 600 W and requires 2x 8-pin power connectors with a 1000 W suggested PSU, whereas the RTX 4090 Mobile fits within a 120 W envelope with no external power connectors. The database shows the MI300 at the 50th percentile among all GPUs with an average benchmark score of zero, while the RTX 4090 Mobile sits at the 84th percentile with an average score of 43667. The data indicates the MI300 has no recorded benchmark entries, making direct performance comparison impossible; the RTX 4090 Mobile is the only one of the two with measurable results in the database.

Architecture Differences

The MI300 uses the Aqua Vanjaram chip built on CDNA 3.0 architecture, fabricated by TSMC on a 5 nm process. The RTX 4090 Mobile uses the AD103 chip based on Ada Lovelace architecture, also from TSMC on a 5 nm process. The MI300 integrates 153,000 million transistors on a 1017 mm² die, achieving a transistor density of 150.4M per mm². The RTX 4090 Mobile contains 45,900 million transistors on a 379 mm² die, with a density of 121.1M per mm². The MI300 packs 14080 shading units, 880 texture mapping units, and zero ROPs, producing a texture rate of 1,496.0 GTexel/s and a pixel rate of 0 MPixel/s. The RTX 4090 Mobile uses 9728 shading units, 304 TMUs, and 112 ROPs, with a texture rate of 515.3 GTexel/s and a pixel rate of 189.8 GPixel/s. The MI300 has no ray tracing cores and no tensor cores listed, while the RTX 4090 Mobile includes 76 ray tracing cores and 304 tensor cores. The MI300's FP32 throughput reaches 47.87 TFLOPS with FP16 at 47.87 TFLOPS (1:1), while the RTX 4090 Mobile delivers 32.98 TFLOPS in both FP32 and FP16 (1:1). Clock behavior differs substantially: the MI300 runs at a 1000 MHz base and 1700 MHz boost, while the RTX 4090 Mobile starts at 1335 MHz base and boosts to 1695 MHz. Memory clocks show 1300 MHz (5.2 Gbps effective) on the MI300 versus 2250 MHz (18 Gbps effective) on the RTX 4090 Mobile. The MI300 connects via PCIe 5.0 x16, while the RTX 4090 Mobile uses PCIe 4.0 x16.

Where Each One Wins

The MI300 wins in raw compute capacity and memory resources. It offers 128 GB of HBM3, which is eight times the RTX 4090 Mobile's 16 GB GDDR6 allocation. Its 8192-bit memory bus provides 5.32 TB/s of bandwidth, roughly 9.2 times the 576.0 GB/s available to the RTX 4090 Mobile. The MI300's FP32 figure of 47.87 TFLOPS exceeds the RTX 4090 Mobile's 32.98 TFLOPS by roughly 45 percent. Texture throughput also favors the MI300 at 1,496.0 GTexel/s versus 515.3 GTexel/s. The MI300's 14080 shading units outnumber the RTX 4090 Mobile's 9728 by about 45 percent. The RTX 4090 Mobile wins in graphics-oriented features that the MI300 lacks entirely: 112 ROPs enable 189.8 GPixel/s pixel throughput, while the MI300 reports 0 MPixel/s. The RTX 4090 Mobile includes hardware ray tracing with 76 RT cores and 304 tensor cores, while the MI300 lists neither. The RTX 4090 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, whereas the MI300 lists N/A for all three APIs. The RTX 4090 Mobile's 120 W power draw makes it suitable for portable integration, while the MI300's 600 W requirement and 267 mm length (10.5 inches) with 111 mm height (4.4 inches) indicate a card-style accelerator. The RTX 4090 Mobile has display outputs described as "Portable Device Dependent," while the MI300 has no outputs at all.

FAQ

Q: Which device has more memory bandwidth?

A: The AMD Instinct MI300 provides 5.32 TB/s through its 8192-bit HBM3 interface, while the NVIDIA GeForce RTX 4090 Mobile offers 576.0 GB/s over a 256-bit GDDR6 bus.

Q: Does the RTX 4090 Mobile support ray tracing?

A: Yes, the RTX 4090 Mobile includes 76 ray tracing cores and 304 tensor cores. The MI300 lists no ray tracing cores or tensor cores in the database.

Q: What is the power requirement difference?

A: The MI300 has a 600 W TDP, uses 2x 8-pin power connectors, and suggests a 1000 W PSU. The RTX 4090 Mobile has a 120 W TDP with no power connectors, described as an IGP (integrated graphics processor).

Q: Which device has a higher average benchmark score?

A: The RTX 4090 Mobile has an average benchmark score of 43667 and sits at the 84th percentile. The MI300 has an average benchmark score of 0 and sits at the 50th percentile, with no benchmark entries recorded.

Q: What are the display output capabilities?

A: The MI300 has no display outputs. The RTX 4090 Mobile's display outputs are "Portable Device Dependent," meaning they vary by the host laptop.

Q: How do the transistor counts compare?

A: The MI300 integrates 153,000 million transistors on a 1017 mm² die, while the RTX 4090 Mobile contains 45,900 million transistors on a 379 mm² die. The MI300 achieves a higher transistor density at 150.4M per mm² versus 121.1M per mm².

Head-to-Head Benchmarks

The database contains no head-to-head benchmark results between these two devices. The MI300 has no benchmark entries at all, resulting in an average benchmark score of 0 and a percentile rank of 50 among all GPUs. The RTX 4090 Mobile, by contrast, has nine recorded benchmark results. Its Geekbench OpenCL score is 180831 and its Geekbench Vulkan score is 170774. Passmark results show 173 in DirectX 10, 262 in DirectX 11, 107 in DirectX 12, 310 in DirectX 9, 984 in G2D, 27212 in G3D, and 12347 in GPU compute. The RTX 4090 Mobile's average benchmark score of 43667 places it at the 84th percentile. Its nearest rivals in the database include the NVIDIA Quadro M6000 with an average score of 43301 and a delta of 0.8 percent, the NVIDIA GeForce RTX 5050 Mobile at 43268 with a 0.9 percent delta, the NVIDIA Quadro M6000 24 GB at 43262 with a 0.9 percent delta, and the NVIDIA RTX A6000 at 44075 with a -0.9 percent delta. The MI300's lack of benchmarks means the database cannot confirm its real-world performance relative to the RTX 4090 Mobile. The compute specifications suggest the MI300 should excel in memory-bound workloads, but the absence of recorded measurements prevents verification. The RTX 4090 Mobile demonstrates strong graphics performance with its DirectX 12 Ultimate support and ray tracing hardware, backed by measurable results across multiple benchmark suites.

Specification Differences

The two devices differ across nearly every recorded specification. The MI300 uses the Aqua Vanjaram chip with CDNA 3.0 architecture, while the RTX 4090 Mobile uses AD103 with Ada Lovelace. The MI300 belongs to the Instinct (MIx) generation, while the RTX 4090 Mobile belongs to the GeForce 40 Mobile generation. Process nodes match at 5 nm from TSMC. Transistor counts differ significantly: 153,000 million for the MI300 versus 45,900 million for the RTX 4090 Mobile. Die sizes are 1017 mm² and 379 mm² respectively, with densities of 150.4M and 121.1M per mm². Base clocks favor the RTX 4090 Mobile at 1335 MHz versus 1000 MHz, while boost clocks are close at 1695 MHz versus 1700 MHz. Memory clocks differ at 2250 MHz (18 Gbps effective) for the RTX 4090 Mobile versus 1300 MHz (5.2 Gbps effective) for the MI300. Memory capacity is 128 GB HBM3 versus 16 GB GDDR6. Bus widths are 8192 bit versus 256 bit. Bandwidth is 5.32 TB/s versus 576.0 GB/s. Shading units number 14080 versus 9728. TMUs are 880 versus 304. ROPs are 0 versus 112. The RTX 4090 Mobile has 76 RT cores and 304 tensor cores; the MI300 has none listed. Pixel rates are 0 MPixel/s versus 189.8 GPixel/s. Texture rates are 1,496.0 GTexel/s versus 515.3 GTexel/s. FP32 is 47.87 TFLOPS versus 32.98 TFLOPS, with both showing FP16 at 1:1 ratios. TDP is 600 W versus 120 W. Power connectors are 2x 8-pin versus none. The MI300 suggests a 1000 W PSU; the RTX 4090 Mobile has no suggested PSU. Bus interfaces are PCIe 5.0 x16 versus PCIe 4.0 x16. Display outputs are none versus "Portable Device Dependent." API support is N/A for DirectX, OpenGL, and Vulkan on the MI300, while the RTX 4090 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI300 measures 267 mm by 111 mm, while the RTX 4090 Mobile has no recorded dimensions and is classified as IGP. Release dates differ by one day: the MI300 launched on 2023-01-03 and the RTX 4090 Mobile on 2023-01-02. The MI300's predecessor is Radeon Instinct, while the RTX 4090 Mobile's predecessor is GeForce 30 Mobile and its successor is GeForce 50 Mobile. The RTX 4090 Mobile has an active production status; the MI300's status is not recorded.