AMD Instinct MI300A vs NVIDIA RTX PRO 4500 Blackwell Server Comparison

Where Each One Wins

The recorded data presents two very different server accelerators with no overlapping benchmark wins, since the database currently holds no benchmark entries for either part. The AMD Instinct MI300A is built around a massive compute-first design aimed at dense FP32 and texture throughput, while the NVIDIA RTX PRO 4500 Blackwell Server is a lower-power, single-slot accelerator with fixed-function ray tracing and tensor hardware. The use-case split is therefore defined by architecture, memory capacity, and thermal envelope rather than measured scores.

The AMD side delivers 61.29 TFLOPS of FP32 compute against 50.70 TFLOPS for the NVIDIA part, a lead of roughly 21% in raw shader math. Its texture rate of 1,915.2 GTexel/s more than doubles the NVIDIA figure of 792.1 GTexel/s, indicating a design optimized for heavy fill-rate workloads such as scientific visualization or high-resolution compute shaders. The MI300A also carries 128 GB of HBM3 memory with 5.32 TB/s of bandwidth, which suits large in-memory datasets, model weights, or simulation grids that would exhaust the NVIDIA card's 32 GB GDDR7 allocation.

The NVIDIA RTX PRO 4500 Blackwell Server wins in every category related to graphics and specialized acceleration. It has 112 ROPs and a pixel rate of 270.5 GPixel/s, whereas the MI300A reports 0 ROPs and 0 MPixel/s, meaning the AMD part cannot rasterize at all. The NVIDIA card includes 82 ray tracing cores and 328 tensor cores, features absent from the AMD specification. Its FP16 throughput matches its FP32 at 50.70 TFLOPS (1:1), which is useful for mixed-precision AI inference, while the MI300A lists no FP16 figure. The NVIDIA part also supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4; the AMD part lists N/A for all three APIs.

Power and physical design further separate the two. The MI300A draws 750 W and requires a suggested 1150 W power supply, while the NVIDIA card draws 165 W with a suggested 450 W supply. The AMD module uses an OAM form factor with no power connectors, whereas the NVIDIA card is single-slot, 267 mm long, 111 mm high, and 40 mm wide, with a single 16-pin connector. For server deployments, the NVIDIA part fits standard PCIe slots and lower-power chassis, while the MI300A targets high-density compute nodes with dedicated power delivery.

Architecture Differences

The two accelerators come from different architectural lineages. The AMD Instinct MI300A uses the CDNA 3.0 architecture on the Aqua Vanjaram chip, fabricated by TSMC on a 5 nm process. It integrates 153,000 million transistors on a die size of 1017 mm², yielding a transistor density of 150.4M per mm². This is a chiplet-based design with an enormous transistor budget, reflecting a focus on raw compute and memory bandwidth rather than graphics output. The NVIDIA RTX PRO 4500 Blackwell Server uses the Blackwell 2.0 architecture on the GB203 chip, also fabricated by TSMC on 5 nm, but with 45,600 million transistors on a 378 mm² die, giving a density of 120.6M per mm². The NVIDIA die is roughly one-third the area and less than one-third the transistor count of the AMD part.

Clock behavior differs substantially. The MI300A runs at a base clock of 1000 MHz and boosts to 2100 MHz, while the NVIDIA part starts higher at 1215 MHz base and boosts to 2415 MHz. The NVIDIA chip therefore relies on higher clocks to reach its performance targets, while the AMD design compensates with more shading units, TMUs, and memory channels. The MI300A has 14,592 shading units and 912 TMUs; the NVIDIA card has 10,496 shading units and 328 TMUs. The AMD part has no ROPs, no ray tracing cores, and no tensor cores listed, whereas the NVIDIA part includes 82 RT cores and 328 tensor cores.

Memory architecture is fundamentally different. The MI300A uses 128 GB of HBM3 on an 8192-bit bus, producing 5.32 TB/s of bandwidth. The NVIDIA card uses 32 GB of GDDR7 on a 256-bit bus, producing 800.3 GB/s. The AMD part's memory clock is 1300 MHz with 5.2 Gbps effective data rate; the NVIDIA part runs at 1563 MHz with 25 Gbps effective. The bandwidth gap is more than sixfold in favor of AMD, but the NVIDIA card's GDDR7 uses far less power per byte moved. The MI300A lists no display outputs, no graphics APIs, and no production status, while the NVIDIA part explicitly lists no outputs but supports modern graphics APIs and is marked as Active production.

Head-to-Head Benchmarks

The database contains no head-to-head benchmark results for these two parts, so direct measured comparisons are unavailable. However, the specification data provides several quantifiable deltas that indicate where each accelerator would dominate in a hypothetical test suite.

FP32 compute is the clearest AMD advantage. The MI300A delivers 61.29 TFLOPS versus 50.70 TFLOPS for the RTX PRO 4500, a lead of 10.59 TFLOPS, which is approximately 20.9% higher. In texture throughput, the AMD part reaches 1,915.2 GTexel/s against 792.1 GTexel/s, a margin of 1,123.1 GTexel/s, meaning the MI300A processes more than 2.4 times the texels per second. Memory bandwidth tells a similar story: 5.32 TB/s versus 800.3 GB/s, a difference of 4.52 TB/s, or roughly 6.6 times more bandwidth on the AMD side. These three metrics point to a part designed for memory-bound and shading-heavy workloads.

The NVIDIA card wins decisively in pixel processing and specialized acceleration. The RTX PRO 4500 has a pixel rate of 270.5 GPixel/s, while the MI300A reports 0 MPixel/s, so the NVIDIA part is effectively the only one capable of rasterization. The NVIDIA card also includes 82 ray tracing cores and 328 tensor cores, which the AMD part lacks entirely. FP16 throughput on the NVIDIA card is 50.70 TFLOPS (1:1), meaning it can match its FP32 rate in half-precision work; the MI300A lists no FP16 figure, suggesting either an unlisted value or a different precision scaling. Clock speeds favor NVIDIA as well: 1215 MHz base and 2415 MHz boost versus 1000 MHz and 2100 MHz, respectively.

Power efficiency is another axis where the NVIDIA part leads. The RTX PRO 4500 draws 165 W against 750 W for the MI300A, a 585 W difference. The NVIDIA card achieves its 50.70 TFLOPS at 165 W, while the AMD part requires 750 W for 61.29 TFLOPS. Per watt, the NVIDIA part delivers approximately 0.307 TFLOPS/W versus 0.0817 TFLOPS/W for the AMD part, a 3.75x efficiency advantage in FP32, though the database does not explicitly list efficiency figures.

Specification Differences

The two parts differ across nearly every specification field recorded in the database.

• Chip: Aqua Vanjaram (AMD) versus GB203 (NVIDIA)
• Architecture: CDNA 3.0 versus Blackwell 2.0
• Generation: Instinct (MIx) versus Server Blackwell (Bxx)
• Transistors: 153,000 million versus 45,600 million
• Die size: 1017 mm² versus 378 mm²
• Transistor density: 150.4M / mm² versus 120.6M / mm²
• Base clock: 1000 MHz versus 1215 MHz
• Boost clock: 2100 MHz versus 2415 MHz
• Memory clock: 1300 MHz 5.2 Gbps effective versus 1563 MHz 25 Gbps effective
• Memory size: 128 GB versus 32 GB
• Memory type: HBM3 versus GDDR7
• Memory bus width: 8192 bit versus 256 bit
• Memory bandwidth: 5.32 TB/s versus 800.3 GB/s
• Shading units: 14,592 versus 10,496
• TMUs: 912 versus 328
• ROPs: 0 versus 112
• RT cores: null versus 82
• Tensor cores: null versus 328
• Pixel rate: 0 MPixel/s versus 270.5 GPixel/s
• Texture rate: 1,915.2 GTexel/s versus 792.1 GTexel/s
• FP32: 61.29 TFLOPS versus 50.70 TFLOPS
• FP16: null versus 50.70 TFLOPS (1:1)
• TDP: 750 W versus 165 W
• Slot width: OAM Module versus Single-slot
• Power connectors: None versus 1x 16-pin
• Suggested PSU: 1150 W versus 450 W
• Display outputs: No outputs versus No outputs
• APIs: DirectX N/A, OpenGL N/A, Vulkan N/A versus DirectX 12 Ultimate, OpenGL 4.6, Vulkan 1.4
• Dimensions: not listed versus 267 mm x 111 mm x 40 mm
• Production status: null versus Active
• Release date: 2023-12-05 versus 2026-03-16
• Predecessor: Radeon Instinct versus Server Hopper
• Successor: null versus Server Rubin

The API support difference is notable: the NVIDIA part supports modern graphics APIs, while the AMD part lists none. The release dates are over two years apart, with the MI300A launching in December 2023 and the RTX PRO 4500 scheduled for March 2026.

FAQ

Q: Which accelerator has more FP32 compute power?

A: The AMD Instinct MI300A delivers 61.29 TFLOPS of FP32, while the NVIDIA RTX PRO 4500 Blackwell Server provides 50.70 TFLOPS. The AMD part is approximately 21% higher in raw FP32 throughput.

Q: Can the AMD Instinct MI300A perform ray tracing or tensor operations?

A: No. The MI300A lists no ray tracing cores and no tensor cores in the database. The NVIDIA RTX PRO 4500 includes 82 ray tracing cores and 328 tensor cores, which are absent from the AMD specification.

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

A: The MI300A has 5.32 TB/s of bandwidth from 128 GB of HBM3 on an 8192-bit bus. The RTX PRO 4500 has 800.3 GB/s from 32 GB of GDDR7 on a 256-bit bus. The AMD part offers roughly 6.6 times more bandwidth.

Q: Which card supports modern graphics APIs?

A: Only the NVIDIA RTX PRO 4500 supports graphics APIs: DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The AMD MI300A lists N/A for all three APIs, reflecting its compute-only orientation.

Q: How do the power requirements compare?

A: The MI300A has a TDP of 750 W and suggests an 1150 W power supply. The RTX PRO 4500 has a TDP of 165 W and suggests a 450 W power supply. The NVIDIA part draws 585 W less.

Q: What are the physical form factors?

A: The MI300A uses an OAM Module slot width with no power connectors. The RTX PRO 4500 is single-slot with dimensions of 267 mm x 111 mm x 40 mm and uses one 16-pin power connector. The NVIDIA part also lists its production status as Active, while the AMD part has no production status recorded.

The Verdict

The data points to two distinct deployment profiles. The AMD Instinct MI300A is the choice for compute-bound, memory-hungry workloads that never need to rasterize. Its 61.29 TFLOPS FP32, 1,915.2 GTexel/s texture rate, and 5.32 TB/s memory bandwidth dominate the NVIDIA card in those specific metrics. The 128 GB HBM3 pool is more than four times the NVIDIA card's 32 GB, which matters for large models or simulations that would otherwise spill to system memory. However, the 750 W TDP and OAM form factor restrict it to specialized nodes with dedicated power delivery.

The NVIDIA RTX PRO 4500 Blackwell Server is the more versatile accelerator for general-purpose server use. It is the only one of the two with rasterization capability, as shown by its 270.5 GPixel/s pixel rate and 112 ROPs, and it adds 82 ray tracing cores and 328 tensor cores. Its 50.70 TFLOPS FP16 (1:1) matches its FP32 rate, making it suitable for AI inference with mixed precision. The 165 W TDP and single-slot design allow deployment in standard PCIe slots with a 450 W power supply, a far lower infrastructure burden. The NVIDIA part also supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the AMD part supports none.

The release timeline further separates them. The MI300A launched in December 2023, while the RTX PRO 4500 is dated March 2026 with an Active production status. The NVIDIA part's predecessor is Server Hopper and its successor is Server Rubin, indicating an ongoing product family. The AMD part has no successor listed. For organizations needing pure compute density and massive memory bandwidth, the MI300A's specifications justify its higher power draw. For anyone requiring graphics APIs, ray tracing, tensor acceleration, or low-power deployment, the RTX PRO 4500 is the only viable option in this comparison.