AMD Instinct MI455X vs NVIDIA RTX PRO 4500 Blackwell Comparison

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark results between the AMD Instinct MI455X and the NVIDIA RTX PRO 4500 Blackwell. The AMD Instinct MI455X has no recorded benchmark scores in the database, an average benchmark score of 0, and a percentile rank of 50 among all GPUs. The NVIDIA RTX PRO 4500 Blackwell, by contrast, has a full set of recorded benchmark results, an average benchmark score of 31532, and a percentile rank of 76.

Because the AMD part has no benchmark entries, a direct numeric comparison of performance is impossible. The data instead shows a one-sided picture: the NVIDIA card delivers measurable results across multiple test suites. In 3DMark Steel Nomad DX12, it scores 7025. Geekbench Vulkan shows 221768. Passmark GPU Compute records 19255. Passmark G3D reaches 33360. These are the only comparable performance data points available, and they exist solely for the NVIDIA side.

The AMD Instinct MI455X does have an average benchmark score of 0, which places it at the 50th percentile in the database's distribution of all GPUs. The NVIDIA RTX PRO 4500 Blackwell sits at the 76th percentile. The delta between these percentile positions suggests the NVIDIA card ranks meaningfully higher in the overall performance distribution, but the lack of MI455X scores means this comparison is structural rather than empirical.

The nearest rivals for the NVIDIA RTX PRO 4500 Blackwell provide context for its standing. The NVIDIA TITAN RTX has an average score of 31676, which is 0.5% higher than the RTX PRO 4500's 31532. The NVIDIA GRID M60-1Q scores 31220, or 1% lower. The NVIDIA Quadro M5000 also scores 31220, also 1% lower. The Intel Arc Pro A30M records 31894, which is 1.1% higher. These deltas are small, indicating that the RTX PRO 4500 Blackwell clusters tightly with several established workstation and professional cards in the database's scoring system.

The absence of AMD benchmark data is itself a finding. The MI455X is recorded with a 2300 W TDP and a slot width described as "EAM Module," which suggests a large-format accelerator with no display outputs. The NVIDIA card is a dual-slot workstation GPU with a 200 W TDP and four DisplayPort 2.1b outputs. These are different product categories, and the benchmark gap likely reflects that the MI455X is not yet represented in the database's test suite rather than an actual performance deficit.

FAQ

Q: Why does the AMD Instinct MI455X have no benchmark scores in the database?

A: The database lists no benchmark entries for the MI455X. Its average benchmark score is recorded as 0, and its percentile rank among all GPUs is 50. The NVIDIA RTX PRO 4500 Blackwell, in contrast, has nine recorded benchmark scores across 3DMark, Geekbench Vulkan, and Passmark tests.

Q: What is the highest recorded benchmark score for the NVIDIA RTX PRO 4500 Blackwell?

A: The highest single score is 221768 in Geekbench Vulkan. The next highest is 33360 in Passmark G3D, followed by 19255 in Passmark GPU Compute and 7025 in 3DMark Steel Nomad DX12.

Q: How does the NVIDIA RTX PRO 4500 Blackwell compare to its nearest rivals in the database?

A: Its average benchmark score is 31532. The NVIDIA TITAN RTX is 0.5% higher at 31676, the Intel Arc Pro A30M is 1.1% higher at 31894, and both the NVIDIA GRID M60-1Q and NVIDIA Quadro M5000 are 1% lower at 31220 and 31206, respectively.

Q: Which card has the higher percentile rank among all GPUs?

A: The NVIDIA RTX PRO 4500 Blackwell has a percentile rank of 76. The AMD Instinct MI455X has a percentile rank of 50. The MI455X percentile reflects its zero benchmark score in the current database.

Q: Does the AMD Instinct MI455X have any Passmark or 3DMark results?

A: No. The database records no Passmark, 3DMark, or Geekbench results for the MI455X. All recorded benchmark data in this comparison belongs to the NVIDIA RTX PRO 4500 Blackwell.

Q: What do the delta percentages for the NVIDIA card's rivals indicate?

A: They show a very tight cluster. The largest margin is 1.1% (Intel Arc Pro A30M above), and the largest deficit is 1% (GRID M60-1Q and Quadro M5000 below). The RTX PRO 4500 Blackwell's average score sits within roughly one percent of four other cards in the database.

Architecture Differences

The two accelerators use fundamentally different architectures. The AMD Instinct MI455X is built on CDNA 5.0, while the NVIDIA RTX PRO 4500 Blackwell uses Blackwell 2.0. The process nodes differ as well: the MI455X is fabricated on a 2 nm node at TSMC, and the RTX PRO 4500 uses a 5 nm node, also at TSMC.

Transistor counts diverge sharply. The MI455X integrates 320,000 million transistors on a die size of 2990 mm², yielding a transistor density of 107.0 million per mm². The RTX PRO 4500 has 45,600 million transistors on a 378 mm² die, for a density of 120.6 million per mm². The MI455X die is roughly eight times larger in area and contains roughly seven times more transistors, yet its density is lower, indicating a different design philosophy with more area spent on memory or interconnect resources.

Memory architecture is one of the largest separations. The MI455X uses HBM4 with 432 GB of capacity, a 24576-bit bus, and 23.3 TB/s of bandwidth. The RTX PRO 4500 uses GDDR7 with 32 GB, a 256-bit bus, and 896.0 GB/s of bandwidth. The MI455X has 13.5 times the memory capacity and roughly 26 times the memory bandwidth, reflecting its role as a large-scale accelerator rather than a workstation GPU.

Shader and compute resources also differ widely. The MI455X has 32768 shading units, 1024 texture mapping units, and no ROPs, giving it a pixel rate of 0 MPixel/s. The RTX PRO 4500 has 10496 shading units, 328 TMUs, and 112 ROPs, with a pixel rate of 269.6 GPixel/s. The NVIDIA card includes 82 RT cores and 328 tensor cores; the AMD part lists neither field. The MI455X has no display outputs, while the RTX PRO 4500 has 4x DisplayPort 2.1b.

The API support differs completely. The MI455X records DirectX, OpenGL, and Vulkan as N/A. The RTX PRO 4500 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. This aligns with the NVIDIA card's workstation display and graphics role versus the AMD part's compute-oriented design.

Specification Differences

Clock speeds differ, though both boost near similar ranges. The MI455X has a base clock of 1000 MHz and a boost clock of 2400 MHz. The RTX PRO 4500 has a base clock of 1635 MHz and a boost clock of 2407 MHz. The NVIDIA card starts higher but boosts only 7 MHz higher than the AMD part. Memory clocks are 1900 MHz (7.6 Gbps effective) for the MI455X and 1750 MHz (28 Gbps effective) for the RTX PRO 4500.

Compute throughput shows the MI455X's advantage. The AMD part delivers 157.3 TFLOPS in both FP32 and FP16 (1:1). The NVIDIA card delivers 50.53 TFLOPS in both FP32 and FP16 (1:1). The MI455X is roughly three times higher in raw floating-point throughput. Texture rate is 2457.6 GTexel/s for the MI455X versus 789.5 GTexel/s for the RTX PRO 4500.

Power and physical specifications are strongly divergent. The MI455X has a TDP of 2300 W and a suggested PSU of 2700 W, with no power connectors listed. The RTX PRO 4500 has a TDP of 200 W, a suggested PSU of 550 W, and a single 16-pin connector. The MI455X is an EAM Module with no dimensions recorded; the RTX PRO 4500 is a dual-slot card measuring 267 mm by 111 mm by 40 mm.

Bus interfaces also differ: the MI455X uses PCIe 6.0 x16, and the RTX PRO 4500 uses PCIe 5.0 x16. Release dates are recorded as 2026-07-22 for the AMD part and 2025-03-17 for the NVIDIA part. The MI455X lists its predecessor as Radeon Instinct; the RTX PRO 4500 lists Workstation Ada. Neither card has a recorded launch MSRP.

The Verdict

The data describes two products with different purposes. The AMD Instinct MI455X is a high-power, compute-focused accelerator with 432 GB of HBM4 memory, 157.3 TFLOPS FP32 throughput, and a 2300 W TDP. It has no display outputs, no graphics API support, and no benchmark scores in the database. Its percentile rank of 50 with a zero score indicates it is currently unmeasured in the database's performance suite.

The NVIDIA RTX PRO 4500 Blackwell is a workstation GPU with 32 GB of GDDR7, 82 RT cores, 328 tensor cores, four display outputs, and full DirectX, OpenGL, and Vulkan support. It has a 200 W TDP and an active production status. Its average benchmark score of 31532 places it at the 76th percentile, within 1.1% of four nearby rivals.

For users who need measured graphics and compute results today, the RTX PRO 4500 Blackwell is the only one of the two with recorded performance data. For users who need massive memory capacity and raw FP32 throughput in a large-format accelerator, the MI455X's specifications point to a different class of hardware, but the database cannot confirm its performance because no scores exist.

The verdict from the data is conditional: the NVIDIA card has demonstrated benchmark standing, while the AMD part's position relies entirely on its listed specifications. The 76th percentile for NVIDIA versus the 50th percentile for AMD is a meaningful gap in the database's distribution, but it originates from the MI455X's lack of recorded scores, not from any measured comparison.

Where Each One Wins

The NVIDIA RTX PRO 4500 Blackwell wins in every category where the database has actual measurements. It has nine benchmark scores, including 7025 in 3DMark Steel Nomad DX12, 221768 in Geekbench Vulkan, 33360 in Passmark G3D, and 19255 in Passmark GPU Compute. It also wins on graphics API support, with DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, and on display connectivity with four DisplayPort 2.1b outputs. Its 269.6 GPixel/s pixel rate and 112 ROPs confirm a rasterization-capable design, and its 82 RT cores provide ray tracing hardware that the AMD part does not list.

The AMD Instinct MI455X wins on raw specification scale. Its 432 GB of HBM4 memory is 13.5 times the NVIDIA card's 32 GB. Its 23.3 TB/s bandwidth is roughly 26 times the NVIDIA card's 896.0 GB/s. Its 157.3 TFLOPS FP32 throughput is about three times the NVIDIA card's 50.53 TFLOPS. Its 32768 shading units triple the NVIDIA card's 10496, and its 24576-bit memory bus is 96 times wider. The MI455X also uses a newer PCIe 6.0 interface versus PCIe 5.0, and its 2 nm process node is smaller than the 5 nm node of the NVIDIA part.

The division is clear: the AMD part leads in memory capacity, memory bandwidth, FP32 compute, texture rate, and interface generation. The NVIDIA part leads in every measured benchmark, graphics features, display outputs, and power efficiency, with a 200 W TDP against 2300 W. The MI455X's 2990 mm² die and 320,000 million transistors dwarf the RTX PRO 4500's 378 mm² and 45,600 million, but the NVIDIA part achieves higher transistor density at 120.6 million per mm² versus 107.0 million. Each card wins in the domain its design targets: the MI455X for massive compute and memory workloads, the RTX PRO 4500 for measured workstation performance and graphics capability.