AMD Instinct MI325X vs NVIDIA RTX 4000 Ada Generation Comparison

FAQ

Q: What are the core architectural identities of the AMD Instinct MI325X and NVIDIA RTX 4000 Ada Generation?

A: The AMD Instinct MI325X uses the CDNA 3.0 architecture with the Aqua Vanjaram chip, while the NVIDIA RTX 4000 Ada Generation uses the Ada Lovelace architecture with the AD104 chip. Both are built on a 5 nm process at TSMC.

Q: How do the memory subsystems compare between these two cards?

A: The AMD Instinct MI325X has 256 GB of HBM3e memory on an 8192-bit bus, delivering 6.14 TB/s of bandwidth. The NVIDIA RTX 4000 Ada Generation has 20 GB of GDDR6 memory on a 160-bit bus, delivering 360.0 GB/s of bandwidth. The AMD card offers substantially more capacity and bandwidth.

Q: Which card has higher compute throughput in FP32 operations?

A: The AMD Instinct MI325X delivers 81.72 TFLOPS of FP32 performance, which is roughly three times the 26.73 TFLOPS of the NVIDIA RTX 4000 Ada Generation. Both cards maintain a 1:1 ratio for FP16 performance.

Q: What is the power consumption difference between the two cards?

A: The AMD Instinct MI325X has a TDP of 1000 W with a suggested power supply of 1400 W, while the NVIDIA RTX 4000 Ada Generation has a TDP of 130 W with a suggested power supply of 300 W.

Q: Which card has display outputs?

A: The NVIDIA RTX 4000 Ada Generation has 4x DisplayPort 1.4a outputs. The AMD Instinct MI325X has no display outputs, as it is designed as an OAM Module for accelerator use.

Q: How does the NVIDIA card rank among all GPUs in the database?

A: The NVIDIA RTX 4000 Ada Generation sits at the 95th percentile among all GPUs, with an average benchmark score of 135218. The AMD Instinct MI325X has no recorded benchmark scores and is placed at the 50th percentile.

Architecture Differences

The AMD Instinct MI325X and NVIDIA RTX 4000 Ada Generation are built for entirely different segments, and the architecture differences reflect that split. The MI325X uses CDNA 3.0, AMD's compute-focused architecture, while the RTX 4000 Ada Generation uses Ada Lovelace, NVIDIA's workstation and graphics architecture.

The transistor counts show the scale gap. The MI325X integrates 153,000 million transistors on a 1017 mm² die, yielding a density of 150.4M transistors per mm². The RTX 4000 Ada Generation integrates 35,800 million transistors on a 294 mm² die, with a density of 121.8M per mm². The MI325X is a massive compute accelerator, while the Ada card is a compact workstation GPU.

The MI325X has 19,456 shading units and 1,216 texture mapping units, but no ROPs and no ray tracing or tensor cores listed. The RTX 4000 Ada Generation has 6,144 shading units, 192 TMUs, 64 ROPs, 48 ray tracing cores, and 192 tensor cores. The NVIDIA card includes dedicated hardware for graphics workloads, while the AMD card is purely compute-oriented.

Memory architecture differs fundamentally. The MI325X uses HBM3e with a 8192-bit bus and 6.14 TB/s bandwidth. The RTX 4000 Ada Generation uses GDDR6 on a 160-bit bus with 360.0 GB/s bandwidth. The AMD card has over 12 times the memory capacity and over 17 times the bandwidth.

The feature sets also diverge. The MI325X has no display outputs, no DirectX, OpenGL, or Vulkan support listed, and uses a PCIe 5.0 x16 interface. The RTX 4000 Ada Generation has 4x DisplayPort 1.4a outputs, supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, and uses a PCIe 4.0 x16 interface. The AMD card is a rack-mounted accelerator, while the NVIDIA card is a single-slot workstation card with full graphics API support.

Clock behavior differs as well. The MI325X runs at a 1000 MHz base and 2100 MHz boost, while the RTX 4000 Ada Generation runs at a 1500 MHz base and 2175 MHz boost. The NVIDIA card has higher clocks despite its much lower power envelope.

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark comparisons between the AMD Instinct MI325X and the NVIDIA RTX 4000 Ada Generation. The MI325X has no recorded benchmark scores, which places it at the 50th percentile among all GPUs with an average score of 0. The RTX 4000 Ada Generation has two recorded benchmark results: 146593 in Geekbench OpenCL and 123842 in Geekbench Vulkan, for an average score of 135218.

The RTX 4000 Ada Generation's position among its nearest rivals provides context for its performance level. It scores essentially level with the NVIDIA A10M, which has an average score of 135230 and a delta of 0%. It is 0.1% ahead of the AMD Radeon PRO W6800, which scores 135396 with a delta of -0.1%. It leads the AMD Radeon Pro W6800X Duo, which scores 135774 with a delta of -0.4%, by a similar margin. It is 0.9% ahead of the AMD Radeon PRO V620, which scores 136472 with a delta of -0.9%. These deltas are all within 1%, indicating that the RTX 4000 Ada Generation performs in a tight cluster with these workstation cards.

The absence of benchmark data for the MI325X means that direct performance comparisons cannot be established from the recorded measurements. The compute specifications, however, suggest that the MI325X targets a much larger compute workload, given its 81.72 TFLOPS FP32 rating against the RTX 4000 Ada Generation's 26.73 TFLOPS. The texture rate also favors the MI325X, which is rated at 2,553.6 GTexel/s versus 417.6 GTexel/s for the NVIDIA card. The pixel rate, however, favors the NVIDIA card, which is rated at 139.2 GPixel/s while the MI325X is rated at 0 MPixel/s due to having no ROPs.

Specification Differences

The two cards differ across nearly every specification field.

The process node is the same at 5 nm, but the die sizes differ substantially: 1017 mm² for the MI325X versus 294 mm² for the RTX 4000 Ada Generation. Transistor counts are 153,000 million versus 35,800 million, and density is 150.4M per mm² versus 121.8M per mm².

Clock speeds differ. The MI325X has a 1000 MHz base and 2100 MHz boost. The RTX 4000 Ada Generation has a 1500 MHz base and 2175 MHz boost. Memory clocks are 1500 MHz (6 Gbps effective) for the AMD card and 2250 MHz (18 Gbps effective) for the NVIDIA card.

Memory capacity is 256 GB of HBM3e for the MI325X versus 20 GB of GDDR6 for the RTX 4000 Ada Generation. The bus widths are 8192 bit versus 160 bit, and bandwidth is 6.14 TB/s versus 360.0 GB/s.

Compute units differ: the MI325X has 19,456 shading units, 1,216 TMUs, and 0 ROPs. The RTX 4000 Ada Generation has 6,144 shading units, 192 TMUs, and 64 ROPs. The NVIDIA card has 48 ray tracing cores and 192 tensor cores; the AMD card lists none.

Output rates differ: the MI325X has 0 MPixel/s pixel rate and 2,553.6 GTexel/s texture rate. The RTX 4000 Ada Generation has 139.2 GPixel/s and 417.6 GTexel/s.

Power figures are dramatically different. The MI325X has a 1000 W TDP and requires a 1400 W suggested power supply. The RTX 4000 Ada Generation has a 130 W TDP and a 300 W suggested power supply.

Form factors and power connectors differ as well. The MI325X is an OAM Module with no power connectors, while the RTX 4000 Ada Generation is a single-slot card with a 1x 16-pin power connector. The NVIDIA card measures 245 mm in length (9.6 inches) and 112 mm in height (4.4 inches); dimensions for the AMD card are not recorded.

Bus interfaces differ: PCIe 5.0 x16 for the MI325X versus PCIe 4.0 x16 for the RTX 4000 Ada Generation. Display outputs are absent on the AMD card, while the NVIDIA card has 4x DisplayPort 1.4a.

API support differs completely. The MI325X lists N/A for DirectX, OpenGL, and Vulkan. The RTX 4000 Ada Generation supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Release dates differ. The MI325X was released on 2024-10-09, while the RTX 4000 Ada Generation was released on 2023-08-08. The NVIDIA card is listed as Active in production, with a successor of Blackwell PRO W. The AMD card's production status is not recorded, and its predecessor is listed as Radeon Instinct.

The Verdict

The recorded data supports a clear split between these two cards. The AMD Instinct MI325X is a high-power compute accelerator with massive memory capacity, enormous FP32 throughput, and no graphics output. The NVIDIA RTX 4000 Ada Generation is a workstation card with graphics APIs, display outputs, ray tracing cores, and a compact single-slot form factor.

The MI325X leads in raw compute specifications. Its 81.72 TFLOPS FP32 is roughly three times the RTX 4000 Ada Generation's 26.73 TFLOPS. Its 256 GB of HBM3e memory with 6.14 TB/s bandwidth far exceeds the 20 GB GDDR6 with 360.0 GB/s on the NVIDIA card. Its texture rate of 2,553.6 GTexel/s is over six times the NVIDIA card's 417.6 GTexel/s.

The RTX 4000 Ada Generation leads in graphics features and efficiency. It has pixel output at 139.2 GPixel/s while the AMD card has none. It has ray tracing cores and tensor cores, which the AMD card lacks. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the AMD card supports none. It runs at 130 W TDP versus 1000 W, and has a 300 W suggested PSU versus 1400 W.

The benchmark data only covers the NVIDIA card. Its average score of 135218 places it at the 95th percentile among all GPUs, with nearest rivals all within 1% of its score. The AMD card has no recorded benchmark scores, so its measured performance cannot be compared directly.

The choice between these cards depends on the workload. The MI325X is designed for compute tasks that require extreme memory capacity and throughput. The RTX 4000 Ada Generation is designed for workstation graphics and general-purpose compute where power efficiency and graphics features matter.

Where Each One Wins

The AMD Instinct MI325X wins in compute throughput scenarios. Its FP32 performance of 81.72 TFLOPS is nearly three times the NVIDIA card's 26.73 TFLOPS. Its texture processing rate of 2,553.6 GTexel/s is over six times the RTX 4000 Ada Generation's 417.6 GTexel/s. Its memory bandwidth of 6.14 TB/s is over 17 times the NVIDIA card's 360.0 GB/s, and its 256 GB capacity is over 12 times the NVIDIA card's 20 GB. These specifications point to workloads that saturate memory and compute resources, such as large-scale data processing, AI training, and scientific simulation.

The NVIDIA RTX 4000 Ada Generation wins in graphics and workstation scenarios. It has pixel processing capability at 139.2 GPixel/s, while the MI325X has no ROPs and outputs 0 MPixel/s. It has 48 ray tracing cores and 192 tensor cores for accelerated graphics and AI inference, features absent from the AMD card. It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, enabling standard graphics applications. Its 4x DisplayPort 1.4a outputs allow direct display connection, which the AMD card cannot do.

The RTX 4000 Ada Generation also wins in power efficiency and system integration. Its 130 W TDP requires a 300 W suggested power supply, compared to the MI325X's 1000 W TDP and 1400 W suggested PSU. The NVIDIA card fits in a single slot and measures 245 mm by 112 mm, while the AMD card uses an OAM Module form factor. The NVIDIA card uses a PCIe 4.0 x16 interface, while the AMD card uses PCIe 5.0 x16, which requires a newer platform.

The recorded benchmark results favor the NVIDIA card in measured performance. Its Geekbench OpenCL score of 146593 and Vulkan score of 123842 give it an average of 135218, placing it at the 95th percentile. The MI325X has no benchmark scores in the database, so its measured performance is not established. The RTX 4000 Ada Generation's nearest rivals, including the NVIDIA A10M and AMD Radeon PRO W6800, all fall within 1% of its score, indicating that it performs consistently with the top workstation GPUs in its class.