AMD Instinct MI300A vs NVIDIA RTX 4500 Ada Generation Comparison

Head-to-Head Benchmarks

The recorded data for the AMD Instinct MI300A contains no benchmark entries, while the NVIDIA RTX 4500 Ada Generation has two direct measurements in the database. The RTX 4500 Ada Generation achieves 160,786 in the Geekbench OpenCL test and 171,401 in the Geekbench Vulkan test. Its average benchmark score across recorded data is 166,094. The AMD Instinct MI300A shows an average benchmark score of zero and a percentile rank of 50 among all GPUs, indicating that no comparable workloads have been recorded for it. Because the head-to-head benchmark table is empty, direct numerical comparisons between these two accelerators cannot be drawn from the database. However, the RTX 4500 Ada Generation’s percentile rank of 97 places it firmly in the upper tier of all recorded GPUs, while the MI300A’s percentile of 50 sits at the median of the distribution, though this latter figure is likely an artifact of missing data rather than a reflection of compute capability.

The RTX 4500 Ada Generation’s nearest rivals provide context for its standing. It sits 0.5% above the NVIDIA RTX A5500 (average score 165,217) and 0.7% above the AMD Radeon PRO W7800 (average score 164,894). It is 1.5% behind the AMD Radeon Pro W6900X (average score 168,574) and 2.2% ahead of the NVIDIA A100 PCIe 40 GB (average score 162,504). These deltas are small, meaning the RTX 4500 Ada Generation clusters tightly with other high-end workstation and data center parts. The MI300A, lacking any recorded benchmarks, cannot be placed in this ranking. The database’s wins counter shows zero wins for both parts, reflecting the absence of any head-to-head test results rather than a parity of performance.

The FP32 throughput figures from the specification data can be used as a proxy for raw compute potential. The AMD Instinct MI300A delivers 61.29 TFLOPS of FP32 performance, while the NVIDIA RTX 4500 Ada Generation delivers 39.63 TFLOPS. This represents a 54.7% advantage for the MI300A in single-precision floating-point math, a substantial margin. Texture fill rates also favor the MI300A: it reaches 1,915.2 GTexel/s versus 619.2 GTexel/s for the RTX 4500 Ada Generation, a 209.3% lead. Conversely, the NVIDIA part dominates pixel throughput with 206.4 GPixel/s, while the AMD part records 0 MPixel/s, a figure that reflects its lack of a traditional raster output stage. These specification-derived comparisons are the only quantitative head-to-head data available, and they show a clear split: the MI300A leads in shader-heavy and texture-heavy workloads, while the RTX 4500 Ada Generation is the only one of the two with any pixel-processing capability.

The Verdict

The data indicates two fundamentally different products with no overlap in measured workloads. The AMD Instinct MI300A is an accelerator with no display outputs, no DirectX, OpenGL, or Vulkan API support, and a 750 W thermal design power. Its specifications point toward a compute-first role: 128 GB of HBM3 memory on an 8192-bit bus, 5.32 TB/s of memory bandwidth, and 14592 shading units. The NVIDIA RTX 4500 Ada Generation is a workstation GPU with 24 GB of GDDR6 memory on a 192-bit bus, 432.0 GB/s of bandwidth, 7680 shading units, 60 RT cores, 240 tensor cores, and four DisplayPort 1.4a outputs. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, and its thermal design power is 210 W.

The verdict from the database is clear: the MI300A is designed for raw compute density with no graphics output, while the RTX 4500 Ada Generation is a dual-purpose workstation card capable of both rendering and compute. The MI300A’s 61.29 TFLOPS FP32 figure and 5.32 TB/s bandwidth are unmatched by the RTX 4500 Ada Generation’s 39.63 TFLOPS and 432.0 GB/s. However, the RTX 4500 Ada Generation has recorded benchmark scores, a 97th percentile ranking, and a 166,094 average score, while the MI300A has none. For users whose workloads are represented by Geekbench OpenCL and Vulkan, the RTX 4500 Ada Generation is the only part with evidence of performance. For users whose workloads prioritize FP32 throughput and memory bandwidth, the MI300A’s specifications are superior, but no measured results confirm this in the database. The RTX 4500 Ada Generation also benefits from a 2580 MHz boost clock versus 2100 MHz on the MI300A, and a base clock of 2070 MHz versus 1000 MHz.

Architecture Differences

The AMD Instinct MI300A uses the Aqua Vanjaram chip based on CDNA 3.0 architecture, manufactured on a 5 nm process at TSMC. It integrates 153,000 million transistors on a 1017 mm² die, resulting in a transistor density of 150.4 million per square millimeter. The NVIDIA RTX 4500 Ada Generation uses the AD103 chip based on Ada Lovelace architecture, also on a 5 nm process at TSMC, but with 45,900 million transistors on a 379 mm² die, giving a transistor density of 121.1 million per square millimeter. The MI300A’s die is 2.7 times larger and holds 3.3 times more transistors, reflecting its focus on massive compute arrays and memory controllers.

The MI300A has 14592 shading units and 912 texture mapping units, but zero ROPs and no RT or tensor core counts listed. The RTX 4500 Ada Generation has 7680 shading units, 240 TMUs, 80 ROPs, 60 RT cores, and 240 tensor cores. This architectural split is stark: the AMD part is optimized for stream processing and texture operations, while the NVIDIA part includes dedicated ray tracing and tensor hardware. The MI300A’s memory subsystem uses HBM3 with a 8192-bit bus and 5.32 TB/s bandwidth, while the RTX 4500 Ada Generation uses GDDR6 with a 192-bit bus and 432.0 GB/s bandwidth. The MI300A’s memory bandwidth is 12.3 times higher than the NVIDIA part’s.

The MI300A operates at a 1000 MHz base clock and 2100 MHz boost clock, with memory at 1300 MHz (5.2 Gbps effective). The RTX 4500 Ada Generation runs at 2070 MHz base and 2580 MHz boost, with memory at 2250 MHz (18 Gbps effective). The NVIDIA part’s higher clock speeds partially offset the AMD part’s larger compute array in terms of per-core efficiency. The MI300A is an OAM Module with no power connectors and no display outputs, while the RTX 4500 Ada Generation is a dual-slot card with four DisplayPort 1.4a outputs, a length of 245 mm (9.6 inches), and a height of 112 mm (4.4 inches). The MI300A suggests a 1150 W power supply, while the RTX 4500 Ada Generation suggests 550 W.

FAQ

Q: Which GPU has higher FP32 compute throughput?

A: The AMD Instinct MI300A delivers 61.29 TFLOPS of FP32 performance, compared to 39.63 TFLOPS for the NVIDIA RTX 4500 Ada Generation, a 54.7% advantage for the AMD part.

Q: What are the recorded benchmark scores for each product?

A: The RTX 4500 Ada Generation has a Geekbench OpenCL score of 160,786 and a Geekbench Vulkan score of 171,401, with an average of 166,094. The MI300A has no recorded benchmark scores in the database.

Q: How do their memory specifications differ?

A: The MI300A has 128 GB of HBM3 memory on an 8192-bit bus with 5.32 TB/s bandwidth. The RTX 4500 Ada Generation has 24 GB of GDDR6 memory on a 192-bit bus with 432.0 GB/s bandwidth.

Q: Does the MI300A support display outputs or graphics APIs?

A: No. The MI300A has no display outputs and lists DirectX, OpenGL, and Vulkan as N/A. The RTX 4500 Ada Generation has four DisplayPort 1.4a outputs and supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Q: Which product has a higher transistor count?

A: The MI300A contains 153,000 million transistors, while the RTX 4500 Ada Generation contains 45,900 million transistors. The MI300A also has a larger die at 1017 mm² versus 379 mm².

Q: How does the RTX 4500 Ada Generation compare to its nearest rivals?

A: It is 0.5% ahead of the RTX A5500, 0.7% ahead of the Radeon PRO W7800, 1.5% behind the Radeon Pro W6900X, and 2.2% ahead of the A100 PCIe 40 GB.

Where Each One Wins

The AMD Instinct MI300A wins in raw compute throughput. Its 61.29 TFLOPS FP32 figure exceeds the RTX 4500 Ada Generation’s 39.63 TFLOPS by a wide margin. Its texture rate of 1,915.2 GTexel/s is more than triple the NVIDIA part’s 619.2 GTexel/s. The MI300A’s memory system is in a different class: 128 GB of HBM3 with 5.32 TB/s bandwidth versus 24 GB of GDDR6 with 432.0 GB/s. These figures indicate workloads that saturate memory bandwidth, such as large matrix operations or data-intensive simulations, would favor the MI300A. The MI300A also has a higher transistor density at 150.4 million per square millimeter, suggesting a more compact logic layout for the same process node.

The NVIDIA RTX 4500 Ada Generation wins in every area where the MI300A has no capability. It has 80 ROPs and a pixel rate of 206.4 GPixel/s, while the MI300A has 0 ROPs and a pixel rate of 0 MPixel/s. The RTX 4500 Ada Generation includes 60 RT cores and 240 tensor cores, features absent from the MI300A’s specification sheet. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, and provides four DisplayPort 1.4a outputs. Its boost clock of 2580 MHz is 480 MHz higher than the MI300A’s 2100 MHz. The RTX 4500 Ada Generation also has recorded benchmark results and a 97th percentile ranking, while the MI300A has none.

The power profile favors the NVIDIA part as well. The RTX 4500 Ada Generation has a 210 W thermal design power and suggests a 550 W power supply, while the MI300A has a 750 W thermal design power and suggests a 1150 W power supply. The NVIDIA card is a dual-slot design with a 245 mm length, while the MI300A is an OAM module with no specified dimensions. For workloads that require rendering, ray tracing, or any form of display output, the RTX 4500 Ada Generation is the only option with data to support it. For workloads that require maximum FP32 throughput and memory bandwidth, the MI300A’s specifications dominate, but the lack of measured results means its real-world performance remains unverified in the database.

Specification Differences

The two accelerators differ across nearly every specification field. The MI300A uses an Aqua Vanjaram chip on CDNA 3.0 architecture, while the RTX 4500 Ada Generation uses an AD103 chip on Ada Lovelace architecture. Both use a 5 nm TSMC process, but the MI300A has 153,000 million transistors versus 45,900 million for the RTX 4500 Ada Generation. Die size is 1017 mm² versus 379 mm², and transistor density is 150.4M per square millimeter versus 121.1M per square millimeter.

Base clocks are 1000 MHz for the MI300A and 2070 MHz for the RTX 4500 Ada Generation; boost clocks are 2100 MHz versus 2580 MHz. Memory clocks are 1300 MHz (5.2 Gbps effective) versus 2250 MHz (18 Gbps effective). Memory size is 128 GB of HBM3 versus 24 GB of GDDR6. Bus width is 8192 bit versus 192 bit, and bandwidth is 5.32 TB/s versus 432.0 GB/s.

Shading units number 14592 versus 7680. TMUs are 912 versus 240. ROPs are 0 versus 80. The RTX 4500 Ada Generation lists 60 RT cores and 240 tensor cores, while the MI300A lists none. Pixel rate is 0 MPixel/s versus 206.4 GPixel/s. Texture rate is 1,915.2 GTexel/s versus 619.2 GTexel/s. FP32 throughput is 61.29 TFLOPS versus 39.63 TFLOPS. The RTX 4500 Ada Generation also lists FP16 at 39.63 TFLOPS (1:1), while the MI300A has no FP16 figure.

Thermal design power is 750 W versus 210 W. Slot width is OAM Module versus dual-slot. The MI300A has no power connectors, and the RTX 4500 Ada Generation also lists none. Suggested PSU is 1150 W versus 550 W. Bus interface is PCIe 5.0 x16 versus PCIe 4.0 x16. Display outputs are none versus four DisplayPort 1.4a. The MI300A lists DirectX, OpenGL, and Vulkan as N/A, while the RTX 4500 Ada Generation supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. Dimensions are unspecified for the MI300A, while the RTX 4500 Ada Generation measures 245 mm in length and 112 mm in height. Release dates are December 5, 2023 for the MI300A and August 8, 2023 for the RTX 4500 Ada Generation.