AMD Instinct MI355X vs NVIDIA RTX 4500 Ada Generation Comparison

AMD Instinct MI355X and NVIDIA RTX 4500 Ada Generation occupy different corners of the hardware spectrum, one built for massive compute density and the other for professional visualization. The recorded data shows a clear split: the MI355X delivers raw compute throughput at an extreme scale, while the RTX 4500 Ada Generation offers a balanced feature set with graphics output and software ecosystem support. The MI355X has zero recorded benchmark scores and a 50th percentile ranking, whereas the RTX 4500 Ada Generation holds a 97th percentile ranking with an average benchmark score of 166094. This gap in measured performance is significant, but it reflects different intended workloads rather than a simple superiority contest.

Where Each One Wins

The AMD Instinct MI355X wins decisively in raw compute throughput. Its FP32 rating of 78.64 TFLOPS doubles the RTX 4500 Ada Generation's 39.63 TFLOPS. The FP16 figure matches FP32 at 78.64 TFLOPS (1:1), which indicates the MI355X does not artificially inflate its half-precision rate. The texture rate of 2,457.6 GTexel/s versus 619.2 GTexel/s shows a 4x advantage in texture processing, and the memory bandwidth of 8.19 TB/s versus 432.0 GB/s represents a nearly 19x gap. The MI355X ships with 288 GB of HBM3e memory on an 8192-bit bus, compared to 24 GB of GDDR6 on a 192-bit bus for the RTX 4500 Ada Generation. For large model training, scientific simulation, or any workload that saturates memory bandwidth, the MI355X is the clear choice.

The NVIDIA RTX 4500 Ada Generation wins in graphics and visualization features. It has 80 ROPs and a pixel rate of 206.4 GPixel/s, while the MI355X has zero ROPs and a pixel rate of 0 MPixel/s. The RTX 4500 Ada Generation includes 60 RT cores and 240 tensor cores, features entirely absent from the MI355X's specification sheet. It also provides four DisplayPort 1.4a outputs, while the MI355X has no display outputs at all. The RTX 4500 Ada Generation supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, whereas the MI355X reports N/A for all three APIs. For rendering, ray tracing, or any interactive graphics workload, the RTX 4500 Ada Generation is the only viable option between the two.

The RTX 4500 Ada Generation also wins on measured benchmark data. Its Geekbench OpenCL score is 160786 and its Geekbench Vulkan score is 171401, giving it an average of 166094. The MI355X has no recorded benchmark scores, which places it at the 50th percentile versus all GPUs, compared to the RTX 4500 Ada Generation's 97th percentile. The nearest rivals to the RTX 4500 Ada Generation include the NVIDIA RTX A5500 at 165217 (0.5% delta), the AMD Radeon PRO W7800 at 164894 (0.7% delta), the AMD Radeon Pro W6900X at 168574 (-1.5% delta), and the NVIDIA A100 PCIe 40 GB at 162504 (2.2% delta). These deltas show the RTX 4500 Ada Generation sits in a competitive cluster, trading blows with other workstation cards, while the MI355X has no comparable data.

Architecture Differences

The MI355X uses the MI350 256CU chip built on CDNA 4.0 architecture, fabricated on a 3 nm process at TSMC. The RTX 4500 Ada Generation uses the AD103 chip built on Ada Lovelace architecture, fabricated on a 5 nm process at TSMC. The MI355X packs 185,000 million transistors into a 2380 mm² die, yielding a transistor density of 77.7M per mm². The RTX 4500 Ada Generation contains 45,900 million transistors on a 379 mm² die, achieving a higher transistor density of 121.1M per mm². The smaller, denser AD103 die reflects NVIDIA's focus on efficiency and graphics features, while AMD's massive chip prioritizes raw compute throughput.

Clock behavior differs substantially. The MI355X runs at a 1000 MHz base clock and 2400 MHz boost clock, with memory at 2000 MHz (8 Gbps effective). The RTX 4500 Ada Generation runs at a 2070 MHz base clock and 2580 MHz boost clock, with memory at 2250 MHz (18 Gbps effective). Despite the lower clocks, the MI355X delivers more than double the FP32 throughput due to its 16384 shading units versus 7680 for the RTX 4500 Ada Generation. The MI355X also has 1024 TMUs versus 240, though it has zero ROPs compared to 80 for the RTX 4500 Ada Generation.

Memory architecture diverges completely. The MI355X uses HBM3e with 288 GB capacity, 8192-bit bus width, and 8.19 TB/s bandwidth. The RTX 4500 Ada Generation uses GDDR6 with 24 GB capacity, 192-bit bus width, and 432.0 GB/s bandwidth. The MI355X's memory subsystem is designed for massive datasets that exceed what any single GPU workstation can hold, while the RTX 4500 Ada Generation's smaller pool is sufficient for typical professional graphics work. Power requirements also diverge sharply: the MI355X has a TDP of 1400 W with a suggested PSU of 1800 W, while the RTX 4500 Ada Generation has a TDP of 210 W with a suggested PSU of 550 W. The MI355X uses an OAM Module slot width with no power connectors, while the RTX 4500 Ada Generation is a dual-slot card with no power connectors listed.

The Verdict

The data supports a straightforward selection based on workload. The AMD Instinct MI355X is for compute-heavy environments where memory capacity and bandwidth dominate. Its 288 GB HBM3e memory, 8.19 TB/s bandwidth, and 78.64 TFLOPS FP32 performance target AI training, scientific computing, and large-scale data processing. The absence of display outputs, graphics APIs, and ray tracing hardware makes it unsuitable for any interactive graphics task. The 1400 W TDP and 1800 W suggested PSU indicate a server or dedicated compute node deployment, not a desktop workstation.

The NVIDIA RTX 4500 Ada Generation is for professional graphics workstations. Its 24 GB GDDR6 memory, 206.4 GPixel/s pixel rate, 60 RT cores, and 240 tensor cores handle rendering, ray tracing, and GPU-accelerated creative workloads. The four DisplayPort 1.4a outputs and full API support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 make it a drop-in solution for interactive applications. The 210 W TDP and 550 W suggested PSU fit standard workstation builds. The measured benchmark data shows it performs competitively against the NVIDIA RTX A5500 (0.5% delta), AMD Radeon PRO W7800 (0.7% delta), and NVIDIA A100 PCIe 40 GB (2.2% delta), while slightly trailing the AMD Radeon Pro W6900X (-1.5% delta).

Users needing raw compute density with no graphics requirements should choose the MI355X. Users needing a graphics-capable workstation card with measured performance data should choose the RTX 4500 Ada Generation. The two do not compete in the same market segment.

FAQ

Q: Which GPU has more memory bandwidth?

A: The AMD Instinct MI355X has 8.19 TB/s bandwidth from its HBM3e memory on an 8192-bit bus. The NVIDIA RTX 4500 Ada Generation has 432.0 GB/s bandwidth from GDDR6 on a 192-bit bus.

Q: Can the AMD Instinct MI355X output to displays?

A: No. The MI355X has no display outputs listed and reports N/A for DirectX, OpenGL, and Vulkan APIs. The RTX 4500 Ada Generation has four DisplayPort 1.4a outputs and supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Q: What is the FP32 performance difference?

A: The MI355X delivers 78.64 TFLOPS FP32, exactly double the RTX 4500 Ada Generation's 39.63 TFLOPS. Both cards also deliver the same FP16 rate as their FP32 rate at a 1:1 ratio.

Q: How do the measured benchmark scores compare?

A: The RTX 4500 Ada Generation has a Geekbench OpenCL score of 160786 and a Geekbench Vulkan score of 171401, averaging 166094. The MI355X has no recorded benchmark scores and sits at the 50th percentile versus all GPUs, while the RTX 4500 Ada Generation sits at the 97th percentile.

Q: What are the power requirements for each card?

A: The MI355X has a 1400 W TDP and requires a suggested PSU of 1800 W. The RTX 4500 Ada Generation has a 210 W TDP and requires a suggested PSU of 550 W.

Q: Which card has ray tracing and tensor cores?

A: Only the RTX 4500 Ada Generation lists 60 RT cores and 240 tensor cores. The MI355X specification shows no RT core or tensor core counts.

Head-to-Head Benchmarks

There are no direct head-to-head benchmark entries in the database for these two cards, and the win count stands at zero for each. The available comparison comes from the RTX 4500 Ada Generation's recorded benchmarks and its nearest rival deltas. The MI355X has no benchmark scores, so any direct performance comparison relies on specification analysis. The FP32 throughput difference is the largest measurable gap: 78.64 TFLOPS versus 39.63 TFLOPS, a 39.01 TFLOPS advantage for the MI355X. Memory bandwidth shows an even wider spread, with the MI355X delivering 8.19 TB/s versus 432.0 GB/s, a difference of 7.76 TB/s. Texture rate favors the MI355X at 2,457.6 GTexel/s versus 619.2 GTexel/s, a 1,838.4 GTexel/s gap.

The RTX 4500 Ada Generation counters with pixel rate, where it posts 206.4 GPixel/s against the MI355X's 0 MPixel/s. The shading unit count favors the MI355X at 16384 versus 7680, but the RTX 4500 Ada Generation has 80 ROPs versus zero, which explains its ability to output pixels. The clock speeds show the RTX 4500 Ada Generation runs higher at 2070 MHz base and 2580 MHz boost, compared to 1000 MHz base and 2400 MHz boost for the MI355X. The RTX 4500 Ada Generation's nearest rival data shows it performs within 2.2% of the NVIDIA A100 PCIe 40 GB and within 1.5% of the AMD Radeon Pro W6900X, indicating it holds its own against established workstation accelerators.

Specification Differences

The two cards differ in nearly every measurable specification. The MI355X uses a 3 nm process while the RTX 4500 Ada Generation uses a 5 nm process, both at TSMC. Transistor count is 185,000 million for the MI355X versus 45,900 million for the RTX 4500 Ada Generation. Die size is 2380 mm² versus 379 mm², with transistor density of 77.7M per mm² versus 121.1M per mm². The MI355X has 16384 shading units, 1024 TMUs, and zero ROPs, while the RTX 4500 Ada Generation has 7680 shading units, 240 TMUs, and 80 ROPs. RT cores and tensor cores exist only on the RTX 4500 Ada Generation at 60 and 240 respectively.

Memory capacity is 288 GB HBM3e versus 24 GB GDDR6, with bus widths of 8192 bit versus 192 bit. Bandwidth is 8.19 TB/s versus 432.0 GB/s. Base clocks are 1000 MHz versus 2070 MHz, boost clocks are 2400 MHz versus 2580 MHz. The MI355X has a TDP of 1400 W and suggested PSU of 1800 W, while the RTX 4500 Ada Generation has a TDP of 210 W and suggested PSU of 550 W. Slot width is OAM Module versus dual-slot. PCIe interface is 5.0 x16 versus 4.0 x16. Display outputs are none versus 4x DisplayPort 1.4a. The MI355X measures 102 mm by 165 mm, while the RTX 4500 Ada Generation measures 245 mm by 112 mm. Release dates are June 2025 for the MI355X and August 2023 for the RTX 4500 Ada Generation. The RTX 4500 Ada Generation has an average benchmark score of 166094 and a 97th percentile ranking, while the MI355X has an average score of zero and a 50th percentile ranking.