AMD Radeon PRO V620 vs NVIDIA RTX A4500 Comparison

The AMD Radeon PRO V620 and NVIDIA RTX A4500 represent two distinct approaches to professional workstation graphics, and the recorded benchmark data reveals a surprisingly balanced contest. The head-to-head measurements show a split decision: the NVIDIA RTX A4500 takes the Geekbench OpenCL test, while the AMD Radeon PRO V620 counters with a decisive victory in Geekbench Vulkan. This balance extends to the broader database, where the two cards occupy different tiers of the overall GPU percentile rankings, with the AMD card achieving a 96th percentile placement against all GPUs and the NVIDIA card sitting at the 93rd percentile.

Head-to-Head Benchmarks

The Geekbench OpenCL result gives the NVIDIA RTX A4500 a clear win with a score of 141837, which is 9.3% higher than the AMD Radeon PRO V620's score of 128580. This is a substantial margin in a compute-oriented API that has historically favored NVIDIA architectures. The OpenCL workload appears to leverage the RTX A4500's higher raw FP32 throughput, which is recorded at 23.65 TFLOPS, and its larger shading unit count of 7168. The data suggests that for OpenCL-based compute tasks, the RTX A4500 holds a meaningful advantage that could translate to faster rendering or simulation times in software that relies on this API.

The Vulkan benchmark flips the script entirely. The AMD Radeon PRO V620 posts a score of 144364, which is 11.1% ahead of the RTX A4500's 129980. This victory is particularly interesting because Vulkan is a lower-level API that can expose architectural efficiency differences more directly. The AMD card's RDNA 2.0 architecture, with its 72 ray accelerators and higher boost clock of 2200 MHz, appears to extract better performance from this API. The 11.1% delta is nearly identical in magnitude to the OpenCL margin, making the overall head-to-head record a perfect 1-1 split.

When placed against the broader database, these two scores tell a more complex story. The AMD Radeon PRO V620's average benchmark score is 136472, which places it just 0.5% ahead of the AMD Radeon Pro W6800X Duo and 0.8% ahead of the AMD Radeon PRO W6800. It also edges out the NVIDIA A10M by 0.9% and the NVIDIA RTX 4000 Ada Generation by 0.9%. Meanwhile, the NVIDIA RTX A4500's average score of 91671 sits 0.6% above the NVIDIA RTX A4500 Mobile, but 0.9% below the AMD Radeon Instinct MI60. The RTX A4500 is 4.8% ahead of the NVIDIA Quadro GP100 and 5.2% ahead of the AMD Radeon PRO W7600. This suggests that while the RTX A4500 has strong individual benchmark results, its average is dragged down relative to the AMD card, which maintains more consistent performance across its recorded tests.

Architecture Differences

The fundamental architectural split is stark. The AMD Radeon PRO V620 uses the Navi 21 chip built on RDNA 2.0 architecture, fabricated on a 7 nm process at TSMC. This chip contains 26,800 million transistors on a 520 mm² die, yielding a transistor density of 51.5 million per square millimeter. The NVIDIA RTX A4500, by contrast, uses the GA102 chip with Ampere architecture, fabricated on an 8 nm process at Samsung. This larger chip packs 28,300 million transistors onto a 628 mm² die, resulting in a lower density of 45.1 million per square millimeter. The process node advantage for AMD is clear, but NVIDIA compensates with a physically larger chip that houses more shading units.

The compute resources differ significantly. The AMD card has 4608 shading units, 288 texture mapping units, and 128 render output units, along with 72 ray accelerators. The NVIDIA card has 7168 shading units, 224 texture mapping units, and 96 render output units, along with 56 ray cores and 224 tensor cores. This means NVIDIA has 55% more shading units, but AMD has 28% more texture units and 33% more render output units. The presence of tensor cores on the RTX A4500 is a notable feature absent from the AMD card, which could matter for AI-accelerated workflows. Clock speeds also diverge sharply: the AMD card operates at a base of 1825 MHz and boosts to 2200 MHz, while the NVIDIA card runs at a much lower base of 1050 MHz with a boost of 1650 MHz. The AMD card's higher clocks help explain its Vulkan performance advantage.

Memory configurations reveal another key difference. The AMD Radeon PRO V620 has 32 GB of GDDR6 memory on a 256-bit bus, delivering 512.0 GB/s of bandwidth. The NVIDIA RTX A4500 has 20 GB of GDDR6 on a wider 320-bit bus, delivering 640.0 GB/s. Both use 16 Gbps effective memory speed, but the NVIDIA card's wider bus gives it 25% more bandwidth. This could benefit large dataset workloads that are bandwidth-bound. The AMD card's larger capacity, however, allows for larger models or bigger textures to reside entirely in VRAM.

The Verdict

The recorded data points to a choice based on workload API and memory capacity needs. For users running OpenCL-heavy applications, the NVIDIA RTX A4500 is the stronger option, with its 9.3% lead in that benchmark. Its higher FP32 throughput and tensor core availability make it suited for compute tasks that leverage these features. The NVIDIA card also requires less power, with a 200 W TDP versus the AMD card's 300 W, and uses a single 8-pin connector instead of two. This makes it easier to integrate into existing systems, as it suggests a 550 W power supply rather than the 700 W recommended for the AMD card.

The AMD Radeon PRO V620 counters with an 11.1% Vulkan advantage and a much larger 32 GB memory pool. Its higher clock speeds and ray accelerator count suggest it may excel in real-time visualization workloads that utilize Vulkan. The AMD card also has a higher average benchmark score of 136472 compared to the RTX A4500's 91671, though this gap is inflated by the different benchmark selections recorded for each card. The 96th percentile placement for AMD versus 93rd for NVIDIA indicates the AMD card sits higher in the overall performance distribution.

Specification Differences

The two cards differ across nearly every major specification category. The AMD Radeon PRO V620 uses a 7 nm process, while the NVIDIA RTX A4500 uses 8 nm. Transistor counts are close but not identical: 26,800 million for AMD versus 28,300 million for NVIDIA. The die sizes are 520 mm² and 628 mm² respectively. Clock speeds show the AMD card with a base of 1825 MHz and boost of 2200 MHz, versus 1050 MHz base and 1650 MHz boost for NVIDIA. Memory capacity is 32 GB for AMD and 20 GB for NVIDIA, with bus widths of 256-bit and 320-bit respectively. Bandwidth is 512.0 GB/s for AMD and 640.0 GB/s for NVIDIA.

The compute unit counts show AMD with 4608 shading units, 288 TMUs, and 128 ROPs, while NVIDIA has 7168 shading units, 224 TMUs, and 96 ROPs. Ray accelerator counts are 72 for AMD and 56 for NVIDIA. The power requirements differ substantially: 300 W TDP with a 700 W suggested PSU for AMD, versus 200 W TDP with a 550 W suggested PSU for NVIDIA. The AMD card uses two 8-pin power connectors, while NVIDIA uses one. Display outputs are entirely absent on the AMD card, while the NVIDIA card offers four DisplayPort 1.4a outputs. Dimensions are similar in length at 267 mm, but the AMD card is taller at 120 mm versus 112 mm for NVIDIA.

FAQ

Q: Which card has a higher average benchmark score?

A: The AMD Radeon PRO V620 has an average benchmark score of 136472, while the NVIDIA RTX A4500 has an average score of 91671.

Q: How do the cards compare in Vulkan performance?

A: The AMD Radeon PRO V620 wins the Geekbench Vulkan test with a score of 144364, which is 11.1% higher than the RTX A4500's score of 129980.

Q: What is the memory bandwidth difference?

A: The NVIDIA RTX A4500 has a higher memory bandwidth of 640.0 GB/s, while the AMD Radeon PRO V620 has 512.0 GB/s.

Q: Which card has more shading units?

A: The NVIDIA RTX A4500 has 7168 shading units, compared to 4608 for the AMD Radeon PRO V620.

Q: What are the power requirements for each card?

A: The AMD Radeon PRO V620 has a 300 W TDP and recommends a 700 W power supply, while the NVIDIA RTX A4500 has a 200 W TDP and recommends a 550 W power supply.

Q: Do both cards support the same graphics APIs?

A: Yes, both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Where Each One Wins

The AMD Radeon PRO V620 wins decisively in Vulkan-based workloads, with its 11.1% lead in that benchmark. This makes it the stronger candidate for applications that leverage Vulkan for real-time rendering or compute. Its 32 GB memory capacity is double the NVIDIA card's 20 GB, which matters for workloads with very large datasets that must fit in VRAM. The higher clock speeds and 72 ray accelerators suggest an advantage in ray-traced scenarios. The AMD card also achieves a 96th percentile placement against all GPUs, two points higher than the NVIDIA card.

The NVIDIA RTX A4500 wins in OpenCL performance, with a 9.3% advantage that is nearly symmetric to AMD's Vulkan win. Its 640.0 GB/s bandwidth is 25% higher, which could benefit bandwidth-sensitive operations. The presence of 224 tensor cores gives it capabilities for AI and deep learning tasks that the AMD card lacks entirely. The lower 200 W TDP and single 8-pin connector make it a more power-efficient choice for systems with stricter power budgets. The NVIDIA card also provides four DisplayPort outputs, while the AMD card has no display outputs at all, making the RTX A4500 the only option for direct display connectivity without a separate GPU.

The balanced 1-1 win record means users must weigh their specific API and feature priorities. OpenCL users should favor NVIDIA, Vulkan users should favor AMD, and users with massive memory requirements should prefer the AMD card's 32 GB capacity. The choice ultimately depends on which benchmark metric aligns with the intended professional workload.