AMD Radeon Pro 575X vs NVIDIA GeForce RTX 4080 Mobile Comparison

AMD Radeon Pro 575X and NVIDIA GeForce RTX 4080 Mobile represent two extremes of the mobile GPU spectrum, separated by architecture generation, market positioning, and raw compute capability. The benchmark data shows a decisive performance gap, with the NVIDIA part winning every head-to-head comparison by a wide margin, yet the AMD part holds its own in specific legacy workloads and efficiency metrics. This analysis walks through the available data to quantify the differences and determine which GPU suits which workload.

Head-to-Head Benchmarks

The direct comparison between these two GPUs is limited to two shared benchmark tests, but the results are unambiguous. In Geekbench OpenCL, the NVIDIA GeForce RTX 4080 Mobile scores 159,575 against the AMD Radeon Pro 575X's 34,773. That is a deltaPct of -78.2% from the AMD part's perspective, meaning the NVIDIA GPU delivers roughly 4.6 times the OpenCL compute performance. This is not a marginal lead; it is a generational chasm. The RTX 4080 Mobile's Ada Lovelace architecture with 7,424 shading units simply overwhelms the older GCN 4.0 design's 2,048 shaders.

In Geekbench Vulkan, the pattern repeats. The RTX 4080 Mobile scores 145,807, while the Radeon Pro 575X manages 37,919, a deltaPct of -74%. Vulkan is a low-overhead API that scales well with raw hardware throughput, and the data shows the NVIDIA GPU's advantage holds even in this more efficient rendering path. The RTX 4080 Mobile's 24.72 TFLOPS FP32 throughput versus the Radeon's 4.489 TFLOPS explains this outcome. The AMD part's scores are consistent across OpenCL and Vulkan (34,773 and 37,919), indicating its compute resources are being fully utilized, but the absolute ceiling is far lower.

Looking at the broader benchmark suite, the RTX 4080 Mobile also has data in PassMark tests that the Radeon Pro 575X lacks. The NVIDIA GPU scores 24,926 in PassMark G3D, 11,191 in GPU Compute, and 929 in G2D. These numbers, while not directly comparable to the AMD part's Geekbench results, reinforce the NVIDIA GPU's positioning as a high-throughput device. The Radeon Pro 575X's average benchmark score across its three tests is 39,116, while the RTX 4080 Mobile's average across nine tests is 38,135. This near-parity in averages is misleading because the NVIDIA GPU's PassMark scores (157 to 286 in DirectX 9/10/11/12) are on a different scale, and its Geekbench scores are far higher. The head-to-head data is the only fair comparison, and it shows a 74-78% deficit for the AMD part.

The Verdict

The data is clear: the NVIDIA GeForce RTX 4080 Mobile is the superior performer in every measurable shared benchmark. For users who need maximum compute throughput in OpenCL or Vulkan workloads, the RTX 4080 Mobile is the only rational choice. Its 12 GB of GDDR6 memory with 432.0 GB/s bandwidth provides 3 times the capacity and double the bandwidth of the Radeon Pro 575X's 4 GB GDDR5 at 217.0 GB/s, which directly impacts large dataset handling and texture streaming. The NVIDIA GPU also supports DirectX 12 Ultimate (12_2) and Vulkan 1.4, whereas the AMD part is limited to DirectX 12 (12_0) and Vulkan 1.3, making the RTX 4080 Mobile future-proof for modern API features like ray tracing and mesh shaders.

However, the AMD Radeon Pro 575X is not without merit. It holds a 1.1% edge over the AMD Radeon Pro 580X and NVIDIA GeForce MX570 A in its nearest rival comparisons, showing it is a competent mid-range part for its era. The Radeon Pro 575X also has a lower TDP of 150 W compared to the RTX 4080 Mobile's 110 W, which is counterintuitive given the latter's far higher performance. This suggests the RTX 4080 Mobile is more power-efficient per unit of work, but the AMD part may be simpler to cool in thin chassis designs. For users on legacy software that is optimized for GCN architecture, the Radeon Pro 575X could still be viable, but the data does not support it as a competitive option against the RTX 4080 Mobile.

Architecture Differences

The architectural gap between these two GPUs is vast. The AMD Radeon Pro 575X uses the Ellesmere chip built on GCN 4.0 architecture, fabricated on a 14 nm process at GlobalFoundries. It contains 5,700 million transistors on a 232 mm² die, yielding a transistor density of 24.6 million per mm². The NVIDIA GeForce RTX 4080 Mobile uses the AD104 chip with Ada Lovelace architecture, built on a 5 nm process at TSMC. It packs 35,800 million transistors into a 294 mm² die, achieving a density of 121.8 million per mm² — nearly five times denser than the AMD part. This process advantage alone explains much of the performance gap, as newer nodes allow higher clock speeds and more functional units per watt.

The compute configurations differ dramatically. The Radeon Pro 575X has 2,048 shading units, 128 TMUs, and 32 ROPs. The RTX 4080 Mobile has 7,424 shading units, 232 TMUs, and 80 ROPs. The NVIDIA GPU also includes 58 RT cores and 232 tensor cores, which are entirely absent from the AMD part. These dedicated units enable hardware-accelerated ray tracing and AI-based features like DLSS, which the Radeon Pro 575X cannot perform. The pixel rate of the RTX 4080 Mobile is 133.2 GPixel/s versus 35.07 GPixel/s for the AMD part, and texture rate is 386.3 GTexel/s versus 140.3 GTexel/s. The FP32 throughput is 24.72 TFLOPS for NVIDIA versus 4.489 TFLOPS for AMD, a 5.5x difference that aligns with the benchmark deltas.

Memory architecture also diverges. The Radeon Pro 575X uses a 256-bit bus with 4 GB GDDR5 at 6.8 Gbps effective, delivering 217.0 GB/s. The RTX 4080 Mobile uses a narrower 192-bit bus but compensates with 12 GB GDDR6 at 18 Gbps effective, achieving 432.0 GB/s. The NVIDIA part's bus interface is PCIe 4.0 x16, while the AMD part uses PCIe 3.0 x16, halving the potential CPU-GPU transfer bandwidth. The RTX 4080 Mobile's memory clock is 2250 MHz, while the AMD part's is 1695 MHz, further widening the bandwidth gap.

FAQ

Q: Which GPU has higher raw compute performance in OpenCL?

A: The NVIDIA GeForce RTX 4080 Mobile scores 159,575 in Geekbench OpenCL, which is 78.2% higher than the AMD Radeon Pro 575X's 34,773. This aligns with the NVIDIA part's 24.72 TFLOPS FP32 throughput versus 4.489 TFLOPS for the AMD part.

Q: Does the AMD Radeon Pro 575X support hardware ray tracing?

A: No. The Radeon Pro 575X has no RT cores listed in its specifications, while the NVIDIA GeForce RTX 4080 Mobile includes 58 RT cores. This means the NVIDIA GPU can accelerate ray-traced workloads in hardware, while the AMD part would rely on software fallback.

Q: What is the memory capacity difference?

A: The NVIDIA GeForce RTX 4080 Mobile has 12 GB of GDDR6 memory, while the AMD Radeon Pro 575X has 4 GB of GDDR5. The NVIDIA part also has higher bandwidth at 432.0 GB/s versus 217.0 GB/s.

Q: Which GPU is more power-efficient?

A: The RTX 4080 Mobile has a TDP of 110 W despite delivering far higher performance, while the Radeon Pro 575X has a TDP of 150 W. The data indicates the NVIDIA GPU achieves more work per watt, though the AMD part's lower absolute performance may be sufficient for simple tasks.

Q: Are these GPUs comparable in DirectX 12 support?

A: No. The RTX 4080 Mobile supports DirectX 12 Ultimate (12_2), which includes features like ray tracing and variable rate shading. The Radeon Pro 575X only supports DirectX 12 (12_0), lacking those advanced features.

Q: Which GPU has a higher percentile ranking among all GPUs?

A: The AMD Radeon Pro 575X ranks at the 82nd percentile, while the NVIDIA GeForce RTX 4080 Mobile ranks at the 81st percentile. Despite the NVIDIA part's far higher raw scores, the percentile rankings are nearly identical due to the different benchmark distributions.

Where Each One Wins

The NVIDIA GeForce RTX 4080 Mobile wins decisively in every category where data exists. It dominates OpenCL and Vulkan compute, with 78.2% and 74% higher scores respectively. Its architecture supports modern features like ray tracing (58 RT cores) and AI acceleration (232 tensor cores), which the AMD part lacks entirely. The 12 GB memory capacity and 432.0 GB/s bandwidth make it suitable for large-scale 3D rendering, machine learning inference, and high-resolution texture workloads. The DirectX 12 Ultimate and Vulkan 1.4 support ensure compatibility with the latest game engines and professional applications. The RTX 4080 Mobile's 133.2 GPixel/s pixel rate and 386.3 GTexel/s texture rate enable high-fill-rate scenarios such as 4K gaming or video editing with multiple streams.

The AMD Radeon Pro 575X wins only in niche scenarios not directly measured by the shared benchmarks. Its 1.1% positive deltaPct over the Radeon Pro 580X and MX570 A indicates it is a solid performer within its own performance class. With a 150 W TDP, it may be easier to integrate into systems with less robust cooling solutions than the RTX 4080 Mobile, though the NVIDIA part's lower 110 W TDP contradicts this assumption. The AMD part's PCIe 3.0 x16 interface is compatible with older platforms, and its GCN 4.0 architecture may have optimizations in legacy OpenCL applications that were written before Ada Lovelace existed. However, the benchmark data does not provide any test where the Radeon Pro 575X outperforms the RTX 4080 Mobile.

Specification Differences

The two GPUs differ in nearly every measurable specification. The process node is 14 nm for AMD versus 5 nm for NVIDIA, with transistor counts of 5,700 million versus 35,800 million. Die size is 232 mm² versus 294 mm², and transistor density is 24.6M/mm² versus 121.8M/mm². The RTX 4080 Mobile has a base clock of 1290 MHz and boost clock of 1665 MHz, while the Radeon Pro 575X lists no base or boost clocks. Memory clock is 2250 MHz (18 Gbps effective) for NVIDIA versus 1695 MHz (6.8 Gbps effective) for AMD.

Shading units are 7,424 versus 2,048; TMUs are 232 versus 128; ROPs are 80 versus 32. The NVIDIA part adds 58 RT cores and 232 tensor cores, which the AMD part lacks. Pixel rate is 133.2 GPixel/s versus 35.07 GPixel/s; texture rate is 386.3 GTexel/s versus 140.3 GTexel/s; FP32 and FP16 are both 24.72 TFLOPS for NVIDIA versus 4.489 TFLOPS for AMD. TDP is 110 W versus 150 W. Bus interface is PCIe 4.0 x16 versus PCIe 3.0 x16. DirectX support is 12 Ultimate (12_2) versus 12 (12_0), and Vulkan is 1.4 versus 1.3. The RTX 4080 Mobile was released in 2023 and is active, while the Radeon Pro 575X was released in 2019 and is end-of-life. The RTX 4080 Mobile's predecessor is GeForce 30 Mobile, and its successor is GeForce 50 Mobile; the AMD part has no listed predecessor or successor.