AMD Instinct MI325X vs NVIDIA GeForce RTX 4090 D Comparison

FAQ

Q: What is the AMD Instinct MI325X and what is it designed for?

A: The AMD Instinct MI325X is an AMD accelerator based on the CDNA 3.0 architecture, built on a 5 nm process with the Aqua Vanjaram chip. It is part of the Instinct (MIx) generation and is designed as a compute accelerator with no display outputs, no DirectX, OpenGL, or Vulkan API support, indicating a server or data center focus.

Q: What is the NVIDIA GeForce RTX 4090 D and what is its target market?

A: The NVIDIA GeForce RTX 4090 D is part of the GeForce 40-series, using the Ada Lovelace architecture with the AD102 chip on a 5 nm process. It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, and includes display outputs (1x HDMI 2.1 and 3x DisplayPort 1.4a), making it suitable for desktop graphics and gaming workloads.

Q: How do the memory configurations compare between the two cards?

A: The AMD Instinct MI325X features 256 GB of HBM3e memory with an 8192-bit bus and a bandwidth of 6.14 TB/s. The NVIDIA GeForce RTX 4090 D has 24 GB of GDDR6X memory on a 384-bit bus with a bandwidth of 1.01 TB/s. The MI325X offers 10.7 times the memory capacity and over 6 times the bandwidth.

Q: Which card has a higher FP32 compute throughput?

A: The AMD Instinct MI325X has an FP32 throughput of 81.72 TFLOPS, while the NVIDIA GeForce RTX 4090 D delivers 73.54 TFLOPS. The MI325X is approximately 11% ahead in raw FP32 performance, though the RTX 4090 D also includes dedicated ray tracing cores (114) and tensor cores (456) that the MI325X lacks.

Q: What is the power consumption and form factor difference?

A: The AMD Instinct MI325X has a TDP of 1000 W and uses an OAM Module form factor with no power connectors (relying on the module interface), and its suggested PSU is 1400 W. The NVIDIA GeForce RTX 4090 D has a TDP of 425 W, is a triple-slot card with a 16-pin connector, and requires an 800 W suggested PSU.

Q: What is the release date and production status of each product?

A: The AMD Instinct MI325X was released on October 9, 2024, with no production status listed. The NVIDIA GeForce RTX 4090 D was released on December 27, 2023, and its production status is listed as end-of-life. The RTX 4090 D has a launch MSRP of 1,599 USD.

The Verdict

The recorded data draws a clear line between two radically different products. The AMD Instinct MI325X is a compute-focused accelerator with a 1000 W TDP, an OAM Module form factor, and no display or graphics API support. The NVIDIA GeForce RTX 4090 D is a consumer graphics card with a 425 W TDP, triple-slot design, display outputs, and full DirectX, OpenGL, and Vulkan support.

Benchmark results only exist for the RTX 4090 D, which holds a percentile rank of 98 among all GPUs and an average benchmark score of 178,050. Its nearest rivals include the NVIDIA RTX PRO 5000 Blackwell (2.2% higher score), NVIDIA A100 SXM4 80 GB (3.1% higher), NVIDIA RTX 5000 Ada Generation (3.6% higher), and NVIDIA A100 SXM4 40 GB (4.9% higher). The MI325X has no recorded benchmarks, an average score of 0, and a percentile of 50, meaning its real-world performance cannot be quantified from the database.

For a buyer needing a desktop graphics card with rendering, ray tracing, and display output, the RTX 4090 D is the only choice with measured performance. For a data center operator needing massive memory capacity (256 GB) and raw FP32 throughput (81.72 TFLOPS), the MI325X offers specifications that no desktop card matches, but its lack of benchmark data means its actual compute efficiency remains unverified. The data supports the RTX 4090 D for client graphics and the MI325X for memory-bound server workloads, with the caveat that the MI325X's performance claims are purely theoretical.

Head-to-Head Benchmarks

The database contains no head-to-head benchmark entries for the AMD Instinct MI325X versus the NVIDIA GeForce RTX 4090 D. The MI325X has an empty benchmarks array and an average benchmark score of 0. The RTX 4090 D, however, has three recorded benchmark results.

In 3DMark Steel Nomad DX12, the RTX 4090 D scores 8,587. This is a synthetic gaming-oriented test that the MI325X cannot run due to its lack of DirectX support. The Geekbench OpenCL score for the RTX 4090 D is 278,621, and its Geekbench Vulkan score is 246,941. These compute tests also require graphics API support, which the MI325X lacks entirely.

The RTX 4090 D's average benchmark score of 178,050 places it in the 98th percentile of all GPUs. Its nearest rival, the NVIDIA RTX PRO 5000 Blackwell, scores 182,109, which is 2.2% higher. The NVIDIA A100 SXM4 80 GB scores 183,725 (3.1% higher), the RTX 5000 Ada Generation scores 184,664 (3.6% higher), and the A100 SXM4 40 GB scores 187,147 (4.9% higher). The RTX 4090 D trails all four rivals by margins between 2.2% and 4.9%, indicating it sits just below these professional accelerators in measured performance.

Because the MI325X has no benchmark scores or rival comparisons, the head-to-head analysis must rely on theoretical specification comparisons. The MI325X's FP32 throughput of 81.72 TFLOPS is 11.1% higher than the RTX 4090 D's 73.54 TFLOPS. Its texture rate of 2,553.6 GTexel/s is 2.2 times the RTX 4090 D's 1,149.1 GTexel/s. However, the RTX 4090 D has a pixel rate of 443.5 GPixel/s while the MI325X is listed at 0 MPixel/s, reflecting that the MI325X has no ROPs and cannot output pixels.

The RTX 4090 D also holds a significant advantage in transistor density efficiency, though both use the same 5 nm TSMC process. The MI325X packs 153,000 million transistors on a 1017 mm² die (150.4M per mm²), while the RTX 4090 D has 76,300 million transistors on a 609 mm² die (125.3M per mm²). The MI325X's die is 67% larger and contains 100.6% more transistors.

Specification Differences

The two cards differ in nearly every measurable specification. The AMD Instinct MI325X uses the Aqua Vanjaram chip with CDNA 3.0 architecture, while the NVIDIA GeForce RTX 4090 D uses the AD102 chip with Ada Lovelace architecture. Both are built on a 5 nm TSMC process, but the MI325X has 153,000 million transistors versus 76,300 million for the RTX 4090 D, and a die size of 1017 mm² versus 609 mm².

Clock speeds differ substantially. The MI325X has a base clock of 1000 MHz and a boost clock of 2100 MHz, while the RTX 4090 D runs at 2280 MHz base and 2520 MHz boost. Memory clocks also diverge: the MI325X operates at 1500 MHz with 6 Gbps effective, and the RTX 4090 D at 1313 MHz with 21 Gbps effective.

Memory configuration is the most dramatic difference. The MI325X carries 256 GB of HBM3e on an 8192-bit bus with 6.14 TB/s bandwidth. The RTX 4090 D has 24 GB of GDDR6X on a 384-bit bus with 1.01 TB/s bandwidth. The MI325X has 19456 shading units and 1216 TMUs, while the RTX 4090 D has 14592 shading units, 456 TMUs, and 176 ROPs. The MI325X lists 0 ROPs, 0 RT cores, and 0 tensor cores, while the RTX 4090 D has 114 RT cores and 456 tensor cores.

Pixel and texture rates reflect these differences. The MI325X has a pixel rate of 0 MPixel/s and a texture rate of 2,553.6 GTexel/s. The RTX 4090 D has a pixel rate of 443.5 GPixel/s and a texture rate of 1,149.1 GTexel/s. FP32 and FP16 throughput are identical within each card (1:1 ratio), at 81.72 TFLOPS for the MI325X and 73.54 TFLOPS for the RTX 4090 D.

Power and physical specifications are also distinct. The MI325X has a TDP of 1000 W, uses an OAM Module slot width, has no power connectors, and requires a 1400 W suggested PSU. The RTX 4090 D has a TDP of 425 W, is triple-slot, uses a single 16-pin connector, and requires an 800 W suggested PSU. The MI325X has no dimensions listed, while the RTX 4090 D measures 304 mm in length, 137 mm in height, and 61 mm in width.

Bus interfaces differ: the MI325X uses PCIe 5.0 x16, and the RTX 4090 D uses PCIe 4.0 x16. Display outputs are absent on the MI325X ("No outputs"), while the RTX 4090 D provides 1x HDMI 2.1 and 3x DisplayPort 1.4a. API support is completely absent on the MI325X (DirectX, OpenGL, Vulkan all N/A), while the RTX 4090 D supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Architecture Differences

The AMD Instinct MI325X is built on the CDNA 3.0 architecture, which is designed for compute acceleration. It uses the Aqua Vanjaram chip with 153,000 million transistors on a 1017 mm² die, yielding a transistor density of 150.4M per mm². The architecture includes 19456 shading units and 1216 TMUs, but no ROPs, RT cores, or tensor cores. This configuration indicates a pure compute design focused on FP32 and FP16 throughput.

The NVIDIA GeForce RTX 4090 D uses the Ada Lovelace architecture with the AD102 chip, containing 76,300 million transistors on a 609 mm² die, with a density of 125.3M per mm². It includes 14592 shading units, 456 TMUs, 176 ROPs, 114 RT cores, and 456 tensor cores. The presence of RT and tensor cores enables ray tracing and AI acceleration, which are absent on the MI325X.

Both architectures use the same 5 nm TSMC process and foundry, but the MI325X's larger die (1017 mm² versus 609 mm²) and higher transistor count (153,000 million versus 76,300 million) reflect a more complex compute-oriented design. The MI325X's transistor density is 20% higher than the RTX 4090 D's, indicating a denser packing of compute units.

Memory architecture also differs fundamentally. The MI325X uses HBM3e with an 8192-bit bus, which explains its massive 6.14 TB/s bandwidth. The RTX 4090 D uses GDDR6X with a 384-bit bus, achieving 1.01 TB/s. The MI325X's memory subsystem is designed for high-bandwidth data center workloads, while the RTX 4090 D's GDDR6X is optimized for consumer graphics with lower latency requirements.

Power efficiency differs as well. The MI325X consumes 1000 W to deliver 81.72 TFLOPS FP32, which is 0.0817 TFLOPS per watt. The RTX 4090 D consumes 425 W to deliver 73.54 TFLOPS, which is 0.173 TFLOPS per watt, making it 2.1 times more power-efficient. However, the MI325X's compute density per die is higher, and its memory bandwidth per watt is also greater (6.14 TB/s per 1000 W versus 1.01 TB/s per 425 W, a 2.6 times advantage).

The absence of display outputs and graphics API support on the MI325X indicates that it is not designed for rendering or interactive graphics. The RTX 4090 D supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, making it compatible with all modern graphics workloads.

Where Each One Wins

The AMD Instinct MI325X wins in raw compute specifications. Its FP32 throughput of 81.72 TFLOPS exceeds the RTX 4090 D's 73.54 TFLOPS by 11.1%. Its texture rate of 2,553.6 GTexel/s is more than double the RTX 4090 D's 1,149.1 GTexel/s. The MI325X's memory configuration is unmatched: 256 GB of HBM3e with 6.14 TB/s bandwidth versus 24 GB GDDR6X with 1.01 TB/s. It uses PCIe 5.0 x16, while the RTX 4090 D uses PCIe 4.0 x16. The MI325X also has a higher transistor count (153,000 million versus 76,300 million) and a larger die (1017 mm² versus 609 mm²), which suggests more compute resources for data center tasks.

The NVIDIA GeForce RTX 4090 D wins in measured benchmark performance and graphics capabilities. It has a percentile rank of 98 among all GPUs, with an average benchmark score of 178,050 across three tests (3DMark Steel Nomad DX12 at 8,587, Geekbench OpenCL at 278,621, and Geekbench Vulkan at 246,941). The MI325X has no benchmarks, so its real-world performance is unverified. The RTX 4090 D includes 114 RT cores and 456 tensor cores, enabling ray tracing and AI workloads that the MI325X cannot handle. It also has a pixel rate of 443.5 GPixel/s, while the MI325X has 0 MPixel/s, making the RTX 4090 D the only option for rendering to a display.

The RTX 4090 D is also significantly more power-efficient. It delivers 73.54 TFLOPS at 425 W (0.173 TFLOPS per watt), versus the MI325X's 81.72 TFLOPS at 1000 W (0.0817 TFLOPS per watt). The RTX 4090 D requires an 800 W suggested PSU versus 1400 W for the MI325X, and it uses a standard triple-slot form factor with a 16-pin connector, while the MI325X uses an OAM Module with no connectors.

For compute workloads requiring massive memory capacity and bandwidth, the MI325X is the clear choice based on specifications. For any graphics, rendering, gaming, or display output, the RTX 4090 D is the only viable option. The RTX 4090 D also holds the advantage of having validated benchmark scores, while the MI325X's performance remains theoretical. In a direct comparison, the RTX 4090 D's measured performance and feature set make it the more complete product for general use, despite the MI325X's superior memory and raw FP32 numbers.