AMD Instinct MI455X vs NVIDIA RTX 3500 Mobile Ada Generation Comparison

Head-to-Head Benchmarks

The recorded data sets no direct head-to-head benchmark results for the AMD Instinct MI455X and the NVIDIA RTX 3500 Mobile Ada Generation. Both entries carry empty benchmark arrays, zero average benchmark scores, and zero wins in the comparison table. This absence of measured performance figures means the analysis must rely entirely on the architectural specifications and the derived capabilities they imply.

The most striking contrast appears in raw compute throughput. The AMD Instinct MI455X delivers 157.3 TFLOPS for FP32 operations, while the NVIDIA RTX 3500 Mobile Ada Generation produces 15.82 TFLOPS under the same precision. That places the AMD part at roughly ten times the FP32 output, a margin that holds identically for FP16 where both list 157.3 TFLOPS and 15.82 TFLOPS respectively with a 1:1 ratio. The texture rate follows a similar pattern: 2,457.6 GTexel/s for the MI455X versus 247.2 GTexel/s for the RTX 3500. The pixel rate, however, tells a different story. The MI455X records 0 MPixel/s, while the RTX 3500 achieves 98.88 GPixel/s. That difference reflects the absence of ROPs on the AMD accelerator, which lists 0 ROPs compared to 64 on the NVIDIA part.

Memory capacity and bandwidth diverge sharply. The MI455X carries 432 GB of HBM4 memory across a 24,576-bit bus, yielding 23.3 TB/s of bandwidth. The RTX 3500 uses 12 GB of GDDR6 on a 192-bit bus, producing 432.0 GB/s. The bandwidth ratio exceeds 50 to 1 in favor of the AMD part, while the capacity ratio stands at 36 to 1. The clock speeds also differ: the MI455X runs a base of 1000 MHz with a boost of 2400 MHz, while the RTX 3500 starts at 1110 MHz and boosts to 1545 MHz. The NVIDIA chip has a higher base clock, but the AMD chip reaches a substantially higher boost ceiling.

Shader resources show a similar scale of difference. The MI455X contains 32,768 shading units and 1,024 texture mapping units. The RTX 3500 houses 5,120 shading units and 160 TMUs. That gives the AMD part 6.4 times the shading units and 6.4 times the TMUs. The RTX 3500 does include dedicated ray tracing cores (40) and tensor cores (160), features entirely absent from the MI455X specification, which lists null values for both. The AMD part also lacks any pixel output capability, reinforcing its compute-focused design.

Power envelopes could hardly be further apart. The MI455X lists a TDP of 2300 W with a suggested power supply of 2700 W. The RTX 3500 draws 100 W and carries no suggested PSU figure. The MI455X uses an EAM Module slot width with no power connectors, while the RTX 3500 is an IGP form factor with no power connectors either. The AMD part connects via PCIe 6.0 x16, whereas the RTX 3500 uses PCIe 4.0 x16.

The Verdict

The data indicates two products built for entirely different roles, with no overlap in intended use. The AMD Instinct MI455X, with its 2300 W TDP, 432 GB HBM4 memory, and 157.3 TFLOPS FP32, targets workloads that demand massive parallel compute and enormous memory capacity. The NVIDIA RTX 3500 Mobile Ada Generation, at 100 W with 12 GB GDDR6 and 15.82 TFLOPS, targets portable systems where power draw and physical footprint constrain the design.

For compute-heavy tasks that fit within the MI455X's memory footprint and power budget, the recorded specifications show a clear advantage: ten times the FP32 throughput, 53 times the memory bandwidth, and 36 times the capacity. The RTX 3500 counters with a higher base clock (1110 MHz versus 1000 MHz), a functional pixel pipeline (98.88 GPixel/s versus 0), and dedicated ray tracing and tensor cores. Those features matter for graphics rendering and AI inference workloads that require those specific hardware paths, but they do not compensate for the raw throughput gap in general-purpose compute.

The percentile rankings offer no additional signal. Both parts sit at the 50th percentile against all GPUs, with an average benchmark score of 0. That parity in ranking likely reflects the absence of recorded benchmark data rather than any meaningful performance equivalence. The production status differs: the RTX 3500 is marked Active, while the MI455X has no production status listed. Release dates place the RTX 3500 in March 2023 and the MI455X in July 2026, suggesting the AMD part is a newer design from a later generation.

A user or planner choosing between these parts should base the decision on the workload class. If the task requires floating-point throughput at the scale of 157.3 TFLOPS, memory bandwidth above 23 TB/s, or memory capacity in the hundreds of gigabytes, the MI455X is the only option that fits. If the task runs on a laptop or mobile workstation, requires graphics output, or needs ray tracing or tensor core acceleration, the RTX 3500 is the relevant choice. The data does not support any claim of general superiority; it supports a division by application domain.

Architecture Differences

The two processors come from fundamentally different architectural lineages. The AMD Instinct MI455X uses the CDNA 5.0 architecture, built on a 2 nm process at TSMC. The chip, designated MI450 256CU, packs 320,000 million transistors into a die size of 2,990 mm², yielding a transistor density of 107.0 million per square millimeter. The NVIDIA RTX 3500 Mobile Ada Generation uses the Ada Lovelace architecture on a 5 nm process, also from TSMC. Its AD104 chip contains 35,800 million transistors across a 294 mm² die, achieving a higher density of 121.8 million per square millimeter.

The transistor density difference is notable: the NVIDIA part packs transistors more tightly despite using a larger process node. The AMD part compensates with an enormous die, roughly ten times the area, which explains its vastly higher transistor count. The MI455X belongs to the Instinct (MIx) generation with a predecessor listed as Radeon Instinct, while the RTX 3500 comes from the GeForce 30-series family (though the generation field also reads Ada-MW), with a predecessor of Ampere-MW and a successor of Blackwell-MW.

The memory subsystems reflect divergent design philosophies. The MI455X uses HBM4, a stacked memory type that provides 23.3 TB/s over a 24,576-bit interface. The RTX 3500 uses GDDR6, a discrete memory type that delivers 432.0 GB/s over a 192-bit bus. The MI455X supports no display outputs, while the RTX 3500 lists "Portable Device Dependent" outputs. The API support follows the same split: the MI455X has no DirectX, OpenGL, or Vulkan support (all listed as N/A), while the RTX 3500 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

The bus interfaces differ by one generation: PCIe 6.0 x16 for the AMD part versus PCIe 4.0 x16 for the NVIDIA part. Both use no power connectors, but the MI455X requires a 2700 W suggested PSU while the RTX 3500 has no suggested PSU listed. The slot widths also diverge: EAM Module for the MI455X, IGP for the RTX 3500.

FAQ

Q: Which processor has higher FP32 compute throughput?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS for FP32, while the NVIDIA RTX 3500 Mobile Ada Generation produces 15.82 TFLOPS. The MI455X offers roughly ten times the FP32 throughput.

Q: How do the memory bandwidth figures compare?

A: The MI455X provides 23.3 TB/s of bandwidth from HBM4 memory across a 24,576-bit bus. The RTX 3500 provides 432.0 GB/s from GDDR6 memory across a 192-bit bus. The AMD part exceeds the NVIDIA part by a factor of approximately 53.

Q: Does the AMD Instinct MI455X support ray tracing or tensor operations?

A: The specification lists null values for both ray tracing cores and tensor cores on the MI455X. The RTX 3500, by contrast, includes 40 ray tracing cores and 160 tensor cores, along with DirectX 12 Ultimate and Vulkan 1.4 support.

Q: What is the power consumption difference?

A: The MI455X lists a TDP of 2300 W with a suggested PSU of 2700 W. The RTX 3500 lists a TDP of 100 W with no suggested PSU figure. The difference is a factor of 23 in TDP.

Q: Which processor has more memory capacity?

A: The MI455X has 432 GB of HBM4 memory. The RTX 3500 has 12 GB of GDDR6 memory. The AMD part offers 36 times the capacity.

Q: When was each product released?

A: The RTX 3500 Mobile Ada Generation has a release date of March 2023. The MI455X has a release date of July 2026. The RTX 3500 is marked as Active in production status, while the MI455X has no production status listed.

Where Each One Wins

The AMD Instinct MI455X wins decisively in any metric that scales with raw compute resources. Its 32,768 shading units and 1,024 TMUs dwarf the RTX 3500's 5,120 and 160 respectively. The FP32 and FP16 throughput of 157.3 TFLOPS represents a tenfold advantage over the RTX 3500's 15.82 TFLOPS. The texture rate of 2,457.6 GTexel/s surpasses the RTX 3500's 247.2 GTexel/s by a factor of ten. The memory bandwidth of 23.3 TB/s versus 432.0 GB/s, and the capacity of 432 GB versus 12 GB, put the MI455X in a different class for data-intensive workloads. Its PCIe 6.0 x16 interface also offers a newer bus generation than the RTX 3500's PCIe 4.0 x16.

The NVIDIA RTX 3500 Mobile Ada Generation wins in areas tied to graphics and portability. It delivers a pixel rate of 98.88 GPixel/s against the MI455X's 0 MPixel/s, a direct consequence of the 64 ROPs on the NVIDIA part versus 0 on the AMD part. The base clock of 1110 MHz exceeds the MI455X's 1000 MHz, giving the RTX 3500 a higher starting frequency. The transistor density of 121.8M per mm² versus 107.0M per mm² shows a more efficient packing of transistors on the NVIDIA die. The RTX 3500 supports display outputs (Portable Device Dependent) and full graphics APIs, while the MI455X has no display outputs and no API support. The 100 W TDP makes the RTX 3500 feasible for mobile systems, whereas the 2300 W TDP of the MI455X requires a fixed installation with a 2700 W suggested power supply.

The RTX 3500 also holds the advantage in architecture features for graphics pipelines: 40 ray tracing cores, 160 tensor cores, DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. None of these appear on the MI455X specification. The production status of Active for the RTX 3500, versus no status for the MI455X, suggests availability differences, though the data does not specify what that means for procurement.

Specification Differences

The two parts differ in nearly every recorded specification field. The process nodes are 2 nm for the MI455X and 5 nm for the RTX 3500, both from TSMC. Transistor counts are 320,000 million versus 35,800 million, and die sizes are 2,990 mm² versus 294 mm². Transistor density favors the RTX 3500 at 121.8M per mm², compared to 107.0M per mm² for the MI455X.

Clock speeds show a mixed picture. The MI455X has a base clock of 1000 MHz and a boost of 2400 MHz. The RTX 3500 has a base of 1110 MHz and a boost of 1545 MHz. Memory clocks are 1900 MHz (7.6 Gbps effective) for the MI455X and 2250 MHz (18 Gbps effective) for the RTX 3500.

Memory specifications differ completely: size (432 GB versus 12 GB), type (HBM4 versus GDDR6), bus width (24,576 bit versus 192 bit), and bandwidth (23.3 TB/s versus 432.0 GB/s). Shading units (32,768 versus 5,120), TMUs (1,024 versus 160), and ROPs (0 versus 64) all diverge. The RTX 3500 lists 40 ray tracing cores and 160 tensor cores; the MI455X lists null for both.

Pixel rates are 0 MPixel/s versus 98.88 GPixel/s, and texture rates are 2,457.6 GTexel/s versus 247.2 GTexel/s. FP32 and FP16 both read 157.3 TFLOPS for the MI455X and 15.82 TFLOPS for the RTX 3500. TDP is 2300 W versus 100 W, with a suggested PSU of 2700 W for the MI455X and none for the RTX 3500.

Slot widths are EAM Module versus IGP. Both use no power connectors. Bus interfaces are PCIe 6.0 x16 versus PCIe 4.0 x16. Display outputs are "No outputs" versus "Portable Device Dependent". API support: the MI455X lists N/A for DirectX, OpenGL, and Vulkan; the RTX 3500 lists DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Release dates are July 2026 for the MI455X and March 2023 for the RTX 3500. Production status is null for the MI455X and Active for the RTX 3500. Predecessors are Radeon Instinct versus Ampere-MW, and successors are null versus Blackwell-MW.