AMD Instinct MI300 vs NVIDIA GeForce RTX 4090 D Comparison

The Verdict

The database shows a fundamental division between these two accelerators. The AMD Instinct MI300 is a compute accelerator with no display outputs, no graphics API support, and a 50th percentile standing among all GPUs in the database. The NVIDIA GeForce RTX 4090 D is a graphics card with full API support, three recorded benchmark scores, and a 98th percentile placement.

The RTX 4090 D delivers the only measurable benchmark results in the record. Its 3DMark Steel Nomad DX12 score of 8587, Geekbench OpenCL score of 278621, and Geekbench Vulkan score of 246941 place it firmly in the consumer and professional graphics segment. The MI300 has no recorded benchmarks and an average benchmark score of zero, meaning the database contains no performance evidence for it.

The verdict from the data is straightforward. Buyers needing a working graphics card with display outputs, API support, and verified benchmark scores should select the RTX 4090 D. The MI300 targets a different purpose entirely: it is a 128 GB HBM3 compute accelerator with a 600 W power draw, built for memory-capacity-bound workloads rather than graphics rendering. The RTX 4090 D carries a launch MSRP of 1,599 USD, while the MI300 has no launch MSRP recorded.

The RTX 4090 D sits 2.2% behind the NVIDIA RTX PRO 5000 Blackwell in average benchmark score, 3.1% behind the NVIDIA A100 SXM4 80 GB, 3.6% behind the NVIDIA RTX 5000 Ada Generation, and 4.9% behind the NVIDIA A100 SXM4 40 GB. These deltas show the 4090 D is competitive with professional workstation cards despite being a consumer-series product.

Architecture Differences

The MI300 uses the CDNA 3.0 architecture on the Aqua Vanjaram chip, fabricated on a 5 nm process at TSMC. It packs 153,000 million transistors across a 1017 mm² die, yielding a transistor density of 150.4M per mm². The chip is built for the Instinct (MIx) generation and succeeds the Radeon Instinct line. It uses HBM3 memory with a 8192 bit bus and 5.32 TB/s bandwidth, paired with a PCIe 5.0 x16 interface.

The RTX 4090 D uses the Ada Lovelace architecture on the AD102 chip, also fabricated on a 5 nm process at TSMC. It contains 76,300 million transistors on a 609 mm² die, giving a transistor density of 125.3M per mm². This is the GeForce 40-series generation, succeeding GeForce 30 and succeeded by GeForce 50. It uses GDDR6X memory with a 384 bit bus and 1.01 TB/s bandwidth, paired with a PCIe 4.0 x16 interface.

The MI300 has 14080 shading units, 880 texture mapping units, and 0 ROPs. Its pixel rate is 0 MPixel/s and its texture rate is 1,496.0 GTexel/s. It has no RT cores and no tensor cores recorded. The RTX 4090 D has 14592 shading units, 456 TMUs, and 176 ROPs. It includes 114 RT cores and 456 tensor cores. Its pixel rate is 443.5 GPixel/s and its texture rate is 1,149.1 GTexel/s.

The MI300 reports 47.87 TFLOPS for both FP32 and FP16 (1:1 ratio). The RTX 4090 D reports 73.54 TFLOPS for both FP32 and FP16 (1:1 ratio). The MI300 draws 600 W with 2x 8-pin power connectors and a suggested 1000 W PSU. The RTX 4090 D draws 425 W with 1x 16-pin power connector and a suggested 800 W PSU.

The MI300 has no display outputs and no DirectX, OpenGL, or Vulkan support. The RTX 4090 D has 1x HDMI 2.1 and 3x DisplayPort 1.4a outputs, with DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 support. The MI300 measures 267 mm by 111 mm; the RTX 4090 D measures 304 mm by 137 mm by 61 mm and is triple-slot. The MI300 released on 2023-01-03, the RTX 4090 D on 2023-12-27. The RTX 4090 D is marked end-of-life production status; the MI300 has no production status recorded.

FAQ

Q: Which card has more memory bandwidth?

A: The AMD Instinct MI300 has 5.32 TB/s of bandwidth from its 128 GB HBM3 memory on an 8192 bit bus. The NVIDIA GeForce RTX 4090 D has 1.01 TB/s from 24 GB GDDR6X on a 384 bit bus.

Q: Which card has higher FP32 compute throughput?

A: The NVIDIA GeForce RTX 4090 D delivers 73.54 TFLOPS FP32, which is 25.67 TFLOPS higher than the AMD Instinct MI300's 47.87 TFLOPS.

Q: Does the MI300 support graphics APIs?

A: No. The database records DirectX as N/A, OpenGL as N/A, and Vulkan as N/A for the MI300. It also has no display outputs.

Q: What benchmark scores does the RTX 4090 D have?

A: The RTX 4090 D scores 8587 in 3DMark Steel Nomad DX12, 278621 in Geekbench OpenCL, and 246941 in Geekbench Vulkan, giving an average of 178050.

Q: How does the RTX 4090 D compare to its nearest rivals?

A: The RTX 4090 D is 2.2% behind the RTX PRO 5000 Blackwell, 3.1% behind the A100 SXM4 80 GB, 3.6% behind the RTX 5000 Ada Generation, and 4.9% behind the A100 SXM4 40 GB in average benchmark score.

Q: What is the transistor density difference?

A: The MI300 has 150.4M transistors per mm² on a 1017 mm² die with 153,000 million transistors. The RTX 4090 D has 125.3M per mm² on a 609 mm² die with 76,300 million transistors.

Specification Differences

The two accelerators differ in nearly every recorded specification. The MI300 uses the Aqua Vanjaram chip with CDNA 3.0 architecture, while the RTX 4090 D uses AD102 with Ada Lovelace. Both use TSMC 5 nm, but the MI300 has 153,000 million transistors versus 76,300 million, and a die size of 1017 mm² versus 609 mm².

Memory configurations diverge sharply. The MI300 has 128 GB HBM3 on an 8192 bit bus with 5.32 TB/s bandwidth and 1300 MHz memory clock (5.2 Gbps effective). The RTX 4090 D has 24 GB GDDR6X on a 384 bit bus with 1.01 TB/s bandwidth and 1313 MHz memory clock (21 Gbps effective).

Compute unit counts differ: the MI300 has 14080 shading units, 880 TMUs, and 0 ROPs; the RTX 4090 D has 14592 shading units, 456 TMUs, and 176 ROPs. The RTX 4090 D adds 114 RT cores and 456 tensor cores, which the MI300 lacks entirely. Pixel rate is 0 MPixel/s for the MI300 versus 443.5 GPixel/s for the RTX 4090 D. Texture rate is 1,496.0 GTexel/s for the MI300 versus 1,149.1 GTexel/s for the RTX 4090 D.

Clocks differ substantially. The MI300 runs at 1000 MHz base and 1700 MHz boost. The RTX 4090 D runs at 2280 MHz base and 2520 MHz boost. FP32 and FP16 throughput are 47.87 TFLOPS for the MI300 and 73.54 TFLOPS for the RTX 4090 D.

Power and physical specifications separate them further. The MI300 has a 600 W TDP with 2x 8-pin connectors and 1000 W suggested PSU. The RTX 4090 D has 425 W TDP with 1x 16-pin connector and 800 W suggested PSU. The MI300 is 267 mm long and 111 mm high with no slot width recorded; the RTX 4090 D is 304 mm long, 137 mm high, 61 mm wide, and triple-slot.

Interface and output capabilities differ completely. The MI300 uses PCIe 5.0 x16 with no display outputs. The RTX 4090 D uses PCIe 4.0 x16 with 1x HDMI 2.1 and 3x DisplayPort 1.4a. API support is absent on the MI300; the RTX 4090 D supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Release timing and lifecycle also differ. The MI300 launched on 2023-01-03 with no production status recorded. The RTX 4090 D launched on 2023-12-27 and is marked end-of-life. The RTX 4090 D has a launch MSRP of 1,599 USD; the MI300 has no launch MSRP. The MI300's predecessor is Radeon Instinct; the RTX 4090 D's predecessor is GeForce 30 and successor is GeForce 50.

Head-to-Head Benchmarks

The database records no head-to-head benchmark entries between the MI300 and RTX 4090 D. The wins count is zero for both sides. This absence of direct comparison data is itself informative: the MI300 has no benchmarks in its record, while the RTX 4090 D has three verified scores.

The RTX 4090 D's 3DMark Steel Nomad DX12 score of 8587 demonstrates functional graphics rendering capability. Its Geekbench OpenCL score of 278621 and Geekbench Vulkan score of 246941 show strong compute and graphics API performance. The average benchmark score of 178050 places it at the 98th percentile among all GPUs in the database.

The MI300's percentile standing is 50th, with an average benchmark score of 0. This does not necessarily indicate poor performance; it reflects the absence of recorded benchmark data. The MI300's design parameters, including 128 GB HBM3 memory and 5.32 TB/s bandwidth, suggest a memory-focused compute role that the database's benchmark suite does not capture.

Comparing the RTX 4090 D to its nearest rivals provides context. The RTX PRO 5000 Blackwell averages 182109, which is 2.2% higher than the 4090 D's 178050. The A100 SXM4 80 GB averages 183725, 3.1% higher. The RTX 5000 Ada Generation averages 184664, 3.6% higher. The A100 SXM4 40 GB averages 187147, 4.9% higher. These deltas indicate the 4090 D performs within 5% of four professional-grade accelerators.

The FP32 comparison shows the RTX 4090 D ahead by 25.67 TFLOPS (73.54 versus 47.87). The MI300 counters with a texture rate advantage of 346.9 GTexel/s (1,496.0 versus 1,149.1). Memory bandwidth favors the MI300 by 4.31 TB/s (5.32 versus 1.01). The RTX 4090 D has 512 more shading units (14592 versus 14080), 176 ROPs versus zero, and 114 RT cores plus 456 tensor cores that the MI300 does not list.

Where Each One Wins

The RTX 4090 D wins in every measured benchmark category. It delivers verified scores in 3DMark Steel Nomad DX12, Geekbench OpenCL, and Geekbench Vulkan. Its 98th percentile ranking versus the MI300's 50th percentile reflects the availability of data as much as raw capability, but the recorded numbers are unambiguous.

The RTX 4090 D wins for graphics workloads. It has display outputs, DirectX 12 Ultimate support, OpenGL 4.6, and Vulkan 1.4. Its 176 ROPs and 443.5 GPixel/s pixel rate enable rasterization output that the MI300 cannot provide with zero ROPs and 0 MPixel/s. The 114 RT cores provide hardware ray tracing capability absent from the MI300's specification list.

The RTX 4090 D wins on raw FP32 throughput with 73.54 TFLOPS versus 47.87 TFLOPS. It also wins on boost clock speed at 2520 MHz versus 1700 MHz, and base clock at 2280 MHz versus 1000 MHz. Its 425 W TDP is 175 W lower than the MI300's 600 W, and its suggested PSU is 800 W versus 1000 W.

The MI300 wins in memory capacity and bandwidth. Its 128 GB HBM3 memory is 104 GB larger than the RTX 4090 D's 24 GB GDDR6X. Its 5.32 TB/s bandwidth is more than five times the 1.01 TB/s of the RTX 4090 D. The 8192 bit bus versus 384 bit bus enables this bandwidth advantage.

The MI300 wins on texture throughput with 1,496.0 GTexel/s versus 1,149.1 GTexel/s. Its 880 TMUs outnumber the RTX 4090 D's 456 TMUs by nearly two to one. The MI300 also has a larger die at 1017 mm² versus 609 mm², more transistors at 153,000 million versus 76,300 million, and higher transistor density at 150.4M per mm² versus 125.3M per mm².

The MI300 uses PCIe 5.0 x16 while the RTX 4090 D uses PCIe 4.0 x16, giving the MI300 a newer host interface. The MI300's power connectors are 2x 8-pin versus the RTX 4090 D's single 16-pin, which may matter for existing power supply compatibility.

The database indicates the RTX 4090 D is the choice for any user needing a functioning graphics card with display output, API support, and verified performance scores. The MI300 is the choice for workloads requiring massive memory capacity (128 GB) and extreme bandwidth (5.32 TB/s) in a compute-only accelerator with no graphics output. The RTX 4090 D's end-of-life status and the MI300's lack of production status both suggest these are mature products with established roles.