AMD Instinct MI300A vs NVIDIA RTX PRO 4500 Blackwell Workstation Comparison

FAQ

Q: What are the core architectural identities of these two accelerators?

A: The AMD Instinct MI300A uses the CDNA 3.0 architecture with the Aqua Vanjaram chip, while the NVIDIA RTX PRO 4500 Blackwell Workstation uses the Blackwell 2.0 architecture with the GB203 chip. Both are manufactured on a 5 nm process at TSMC.

Q: How do the memory subsystems compare?

A: The MI300A carries 128 GB of HBM3 across an 8192-bit bus, delivering 5.32 TB/s of bandwidth. The RTX PRO 4500 carries 32 GB of GDDR7 across a 256-bit bus, delivering 896.0 GB/s. The MI300A offers four times the capacity and roughly 5.9 times the bandwidth.

Q: Which card has higher raw FP32 compute?

A: The MI300A delivers 61.29 TFLOPS FP32, which is 21.3% ahead of the RTX PRO 4500's 50.53 TFLOPS. The RTX PRO 4500 matches its FP32 throughput in FP16 at 50.53 TFLOPS (1:1), a feature the MI300A's listed data does not specify.

Q: What are the power requirements?

A: The MI300A has a 750 W TDP and a suggested PSU of 1150 W, while the RTX PRO 4500 has a 200 W TDP and a suggested PSU of 550 W. The MI300A uses no power connectors (OAM module), whereas the RTX PRO 4500 uses a single 16-pin connector.

Q: Do both cards support the same PCIe interface?

A: Yes, both use PCIe 5.0 x16. However, the RTX PRO 4500 is a dual-slot card with four DisplayPort 2.1b outputs, while the MI300A is an OAM module with no display outputs.

Q: What are the release dates?

A: The MI300A launched on December 5, 2023, and the RTX PRO 4500 launched on March 17, 2025. The RTX PRO 4500 is listed as Active in production status.

The Verdict

The data separates these two devices into distinct roles. The AMD Instinct MI300A is built for memory-bound and compute-bound workloads that demand enormous capacity and bandwidth. Its 128 GB HBM3 pool and 5.32 TB/s bandwidth dwarf the RTX PRO 4500's 32 GB GDDR7 and 896.0 GB/s. Any task that holds large datasets in working memory benefits from the MI300A's design. Its 61.29 TFLOPS FP32 also leads by 21.3% over the RTX PRO 4500, and its texture rate of 1,915.2 GTexel/s is 2.4 times higher.

The NVIDIA RTX PRO 4500 Blackwell Workstation is the more balanced and practical accelerator for a workstation context. It has display outputs, a 200 W TDP, and a dual-slot form factor with measured dimensions. The MI300A has no display outputs and requires a 1150 W PSU. The RTX PRO 4500 includes 82 ray tracing cores and 328 tensor cores, features absent from the MI300A's listed specifications. Its pixel rate of 269.6 GPixel/s and 112 ROPs indicate a fully realized graphics pipeline, while the MI300A lists 0 ROPs and 0 MPixel/s.

For users who need a self-contained workstation GPU with graphics output, ray tracing, and modest power draw, the RTX PRO 4500 is the clear selection. For users who need maximum memory capacity, memory bandwidth, and FP32 throughput in a server accelerator form factor, the MI300A is the data-driven choice. The MI300A has a higher transistor count (153,000 million versus 45,600 million) and a larger die (1017 mm² versus 378 mm²), reinforcing its role as a large-scale compute device rather than a desktop workstation part.

Head-to-Head Benchmarks

The database lists no direct head-to-head benchmark entries for these two accelerators, and both have an average benchmark score of 0 with a 50th percentile against all GPUs. The comparison therefore rests on the recorded specification data.

The MI300A wins decisively in memory bandwidth. Its 5.32 TB/s is roughly 5.9 times the RTX PRO 4500's 896.0 GB/s. That difference matters for workloads that stream large arrays or train models with massive parameter sets. The MI300A also leads in FP32 compute by 10.76 TFLOPS, a 21.3% advantage over the RTX PRO 4500's 50.53 TFLOPS.

The texture rate comparison favors the MI300A heavily: 1,915.2 GTexel/s versus 789.5 GTexel/s, a 2.4 times advantage. The MI300A's 912 TMUs versus 328 TMUs explains part of this gap, as does its higher boost clock in memory operations.

The RTX PRO 4500 wins in pixel throughput. It delivers 269.6 GPixel/s, while the MI300A lists 0 MPixel/s. The RTX PRO 4500 also has a higher boost clock at 2407 MHz versus 2100 MHz for the MI300A, and a higher base clock at 1635 MHz versus 1000 MHz. The RTX PRO 4500's memory operates at 1750 MHz (28 Gbps effective) versus the MI300A's 1300 MHz (5.2 Gbps effective), though the MI300A compensates with an 8192-bit bus.

The RTX PRO 4500's transistor density is lower at 120.6M / mm² versus 150.4M / mm² for the MI300A. That density difference reflects the MI300A's larger die and higher transistor budget.

Specification Differences

The two accelerators differ in nearly every measured category. The MI300A uses 153,000 million transistors on a 1017 mm² die, while the RTX PRO 4500 uses 45,600 million transistors on a 378 mm² die. The MI300A's transistor density is 150.4M / mm², the RTX PRO 4500's is 120.6M / mm².

Clock speeds differ substantially. The MI300A runs at 1000 MHz base and 2100 MHz boost. The RTX PRO 4500 runs at 1635 MHz base and 2407 MHz boost. The MI300A's memory clock is 1300 MHz (5.2 Gbps effective), while the RTX PRO 4500's is 1750 MHz (28 Gbps effective).

Memory configuration is a major differentiator. The MI300A uses 128 GB HBM3 on a 8192-bit bus with 5.32 TB/s bandwidth. The RTX PRO 4500 uses 32 GB GDDR7 on a 256-bit bus with 896.0 GB/s bandwidth.

Compute resources differ as well. The MI300A has 14,592 shading units and 912 TMUs, but 0 ROPs. The RTX PRO 4500 has 10,496 shading units, 328 TMUs, and 112 ROPs. The RTX PRO 4500 lists 82 ray tracing cores and 328 tensor cores; the MI300A lists none.

Power and physical specifications diverge sharply. The MI300A has a 750 W TDP, an OAM module slot width, no power connectors, and a suggested PSU of 1150 W. The RTX PRO 4500 has a 200 W TDP, a dual-slot width, one 16-pin power connector, and a suggested PSU of 550 W. The RTX PRO 4500 measures 267 mm by 111 mm by 40 mm; the MI300A has no listed dimensions.

Display support is exclusive to the RTX PRO 4500, which offers 4x DisplayPort 2.1b outputs. The MI300A has no outputs. API support also differs: the RTX PRO 4500 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the MI300A lists N/A for all three.

Architecture Differences

The MI300A is built on CDNA 3.0, AMD's compute-focused architecture, and uses the Aqua Vanjaram chip. The RTX PRO 4500 uses Blackwell 2.0 with the GB203 chip, NVIDIA's workstation-oriented architecture. Both use a 5 nm TSMC process, but the MI300A packs 153,000 million transistors versus 45,600 million for the RTX PRO 4500.

The MI300A's memory design centers on HBM3 with an 8192-bit bus, which enables its 5.32 TB/s bandwidth. The RTX PRO 4500 uses GDDR7 with a 256-bit bus and 896.0 GB/s bandwidth. The MI300A's 128 GB capacity is four times the RTX PRO 4500's 32 GB.

The MI300A has no ray tracing cores, no tensor cores, no ROPs, and no display outputs in the recorded data. The RTX PRO 4500 has 82 ray tracing cores, 328 tensor cores, 112 ROPs, and four display outputs. The MI300A's 1,915.2 GTexel/s texture rate and 61.29 TFLOPS FP32 indicate a brute-force compute design. The RTX PRO 4500's 269.6 GPixel/s pixel rate, 50.53 TFLOPS FP32 and FP16 (1:1), and full graphics API support indicate a hybrid compute and graphics design.

The MI300A is an OAM module with no power connectors, suggesting it draws power through the module interface in a server chassis. The RTX PRO 4500 is a dual-slot PCIe card with a standard 16-pin connector, designed for insertion into a workstation motherboard. The MI300A's suggested PSU of 1150 W versus the RTX PRO 4500's 550 W reflects the MI300A's higher power envelope and compute density.

The RTX PRO 4500's FP16 throughput matches its FP32 throughput at 50.53 TFLOPS (1:1). The MI300A's FP16 figure is not recorded, so the comparison cannot extend into half-precision workloads. The MI300A's predecessor is listed as Radeon Instinct, while the RTX PRO 4500's predecessor is Workstation Ada.

Where Each One Wins

The MI300A wins in memory capacity, memory bandwidth, FP32 compute, and texture throughput. Its 128 GB HBM3 pool and 5.32 TB/s bandwidth serve workloads that require large in-memory datasets, such as large-scale neural network training or scientific simulation. Its 61.29 TFLOPS FP32 and 1,915.2 GTexel/s texture rate suit dense compute kernels and high-throughput texturing tasks. The 2.4 times texture rate advantage over the RTX PRO 4500 indicates strong fill-rate performance for compute-heavy rendering pipelines.

The RTX PRO 4500 wins in pixel throughput, clock speeds, ray tracing, tensor operations, graphics API support, and power efficiency. Its 269.6 GPixel/s pixel rate and 112 ROPs enable traditional rasterization workloads. Its 82 ray tracing cores and 328 tensor cores support ray-traced rendering and AI-accelerated workflows. Its support for DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 makes it compatible with standard workstation software stacks. Its 200 W TDP and 550 W suggested PSU require far less power infrastructure than the MI300A's 750 W TDP and 1150 W suggested PSU.

The MI300A's 5.32 TB/s bandwidth is 5.9 times the RTX PRO 4500's 896.0 GB/s. That gap dominates any bandwidth-sensitive comparison. The RTX PRO 4500's boost clock of 2407 MHz is 14.6% higher than the MI300A's 2100 MHz, and its base clock of 1635 MHz is 63.5% higher than the MI300A's 1000 MHz. Higher clocks help latency-sensitive and lightly threaded workloads, while the MI300A's wider bus and larger memory pool help throughput-heavy workloads.

The MI300A's 150.4M / mm² transistor density versus the RTX PRO 4500's 120.6M / mm² suggests a more compact logic layout per area. The MI300A's 1017 mm² die is 2.7 times larger than the RTX PRO 4500's 378 mm² die. The RTX PRO 4500's dual-slot dimensions (267 mm length, 111 mm height, 40 mm width) make it physically installable in a workstation chassis, while the MI300A's OAM form factor targets server racks.

The RTX PRO 4500 is the only one of the two with any display output capability. Its four DisplayPort 2.1b outputs allow direct monitor connection, a feature entirely absent from the MI300A. The MI300A's lack of ROPs and pixel rate reinforces its position as a non-rendering compute accelerator. The RTX PRO 4500's production status is Active, while the MI300A's production status is not recorded.