AMD Radeon Pro 555X vs NVIDIA GeForce GTX 1080 Ti Comparison

Head-to-Head Benchmarks

The recorded data shows a decisive performance gap between the NVIDIA GeForce GTX 1080 Ti and the AMD Radeon Pro 555X across all three shared benchmark tests. The GTX 1080 Ti wins every head-to-head comparison, with the largest margin appearing in OpenCL compute workloads. In the geekbench_opencl test, the GTX 1080 Ti scores 67,929 against the Radeon Pro 555X's 12,628, a delta of 437.9%. This is not a close contest; the NVIDIA card delivers more than five times the raw OpenCL throughput of the AMD mobile part.

The geekbench_vulkan test shows a similar, though slightly less extreme, pattern. The GTX 1080 Ti posts 40,511 points, while the Radeon Pro 555X manages 12,855. The delta here is 215.1%, meaning the NVIDIA card more than triples the AMD card's Vulkan score. In geekbench_metal, the gap narrows but remains substantial: the GTX 1080 Ti scores 30,624 versus 14,479 for the Radeon Pro 555X, a 111.5% advantage. Even in the closest test, the NVIDIA card still delivers more than double the performance.

Looking at the broader database averages, the GTX 1080 Ti holds an average benchmark score of 15,548 across all recorded tests, while the Radeon Pro 555X averages 13,321. That works out to roughly a 16.7% overall lead for the NVIDIA card in aggregate. However, this aggregate figure masks the true nature of the head-to-head results. The shared benchmarks are the most direct comparison, and they show the GTX 1080 Ti leading by margins ranging from roughly 111% to 438%. The average score is pulled down for the GTX 1080 Ti by its less impressive showings in certain legacy DirectX tests, which are not present in the Radeon Pro 555X's benchmark set.

The percentile rankings place both cards in the middle of the database. The GTX 1080 Ti sits at the 58th percentile against all GPUs, while the Radeon Pro 555X sits at the 54th percentile. Despite the massive head-to-head deltas, both cards occupy similar positions relative to the entire GPU landscape. This suggests that the Radeon Pro 555X, while far slower than the GTX 1080 Ti, still outperforms a significant portion of the database's GPU population.

Where Each One Wins

The NVIDIA GeForce GTX 1080 Ti wins every benchmark category shared between the two cards. Its strongest showing is in OpenCL compute, where the 437.9% delta indicates a workload designed for heavy parallel processing. The Vulkan test, with a 215.1% delta, reinforces this pattern: the GTX 1080 Ti excels in modern, low-overhead graphics APIs. The Metal result, while the smallest margin at 111.5%, still represents a doubling of the AMD card's score. For any task that leverages these APIs, the database clearly favors the GTX 1080 Ti.

The AMD Radeon Pro 555X does not win a single head-to-head test in the recorded data. The winsA count is 3 for the GTX 1080 Ti and 0 for the Radeon Pro 555X. However, the Radeon Pro 555X's nearest rivals provide context for its positioning. It sits within 0.4% of the AMD FirePro M6100 and AMD Radeon RX 5500M, and within 0.2% of the NVIDIA GeForce GTX 480. This means the Radeon Pro 555X is competitively placed within its own performance tier, even if that tier is far below the GTX 1080 Ti's level.

For use-case analysis, the GTX 1080 Ti is the clear choice for compute-heavy tasks, high-resolution gaming, and any workload that can utilize Vulkan or OpenCL. The Radeon Pro 555X, with its 4 GB memory and 128-bit bus, is better suited to lightweight, portable workloads where power draw and physical footprint matter more than raw performance. Its IGP slot width and lack of power connectors indicate a design intended for mobile workstations, not desktop gaming rigs. The data does not support any scenario where the Radeon Pro 555X outperforms the GTX 1080 Ti in a shared benchmark.

FAQ

Q: Which GPU has a higher OpenCL benchmark score?

A: The NVIDIA GeForce GTX 1080 Ti scores 67,929 in geekbench_opencl, while the AMD Radeon Pro 555X scores 12,628. The GTX 1080 Ti leads by 437.9%.

Q: What is the delta in the Vulkan benchmark between the two cards?

A: The GTX 1080 Ti scores 40,511 and the Radeon Pro 555X scores 12,855 in geekbench_vulkan, a 215.1% advantage for the NVIDIA card.

Q: How do their average benchmark scores compare?

A: The GTX 1080 Ti has an average benchmark score of 15,548, while the Radeon Pro 555X averages 13,321. The GTX 1080 Ti also holds a 58th percentile ranking versus the Radeon Pro 555X's 54th percentile.

Q: Does the Radeon Pro 555X win any head-to-head test?

A: No. The recorded data shows 3 wins for the GTX 1080 Ti and 0 wins for the Radeon Pro 555X across all shared benchmarks.

Q: What is the closest benchmark result between the two?

A: The geekbench_metal test is the closest, with the GTX 1080 Ti scoring 30,624 and the Radeon Pro 555X scoring 14,479. The delta is 111.5%, still a doubling of the AMD card's score.

Q: Are these GPUs closely matched according to the database?

A: Not in direct comparison. The head-to-head deltas range from 111.5% to 437.9% in favor of the GTX 1080 Ti. However, their percentile rankings are close, at 58th and 54th, because both outperform many older or lower-tier GPUs in the database.

Specification Differences

The two cards differ in almost every major specification category. The NVIDIA GeForce GTX 1080 Ti features 11 GB of GDDR5X memory on a 352-bit bus, delivering 484.4 GB/s of bandwidth. The AMD Radeon Pro 555X has 4 GB of GDDR5 memory on a 128-bit bus, with 94.08 GB/s of bandwidth. The memory clock also differs: the GTX 1080 Ti runs at 1376 MHz (11 Gbps effective), while the Radeon Pro 555X runs at 1470 MHz (5.9 Gbps effective). Despite the higher memory clock on the AMD card, its narrower bus and slower effective speed result in far lower bandwidth.

The compute resources are starkly different. The GTX 1080 Ti has 3,584 shading units, 224 texture mapping units, and 88 raster output units. The Radeon Pro 555X has 768 shading units, 48 TMUs, and 16 ROPs. The GTX 1080 Ti's pixel rate is 139.2 GPixel/s versus 14.51 GPixel/s for the Radeon Pro 555X. Texture rates are 354.4 GTexel/s and 43.54 GTexel/s, respectively. FP32 performance is 11.34 TFLOPS for the NVIDIA card and 1,393.2 GFLOPS (roughly 1.39 TFLOPS) for the AMD card. FP16 performance shows a notable architectural difference: the GTX 1080 Ti delivers 177.2 GFLOPS (1:64 ratio), while the Radeon Pro 555X delivers 1,393.2 GFLOPS (1:1 ratio).

Power and physical specifications also diverge significantly. The GTX 1080 Ti has a 250 W TDP, dual-slot width, and requires 1x 6-pin plus 1x 8-pin power connectors, with a suggested 600 W PSU. The Radeon Pro 555X has a 75 W TDP, IGP slot width, and no power connectors. The bus interface differs as well: PCIe 3.0 x16 for the GTX 1080 Ti versus PCIe 3.0 x8 for the Radeon Pro 555X. Display outputs are 1x HDMI 2.0 and 3x DisplayPort 1.4a for the NVIDIA card, while the AMD card is listed as "Portable Device Dependent." The GTX 1080 Ti measures 267 mm in length, 112 mm in height, and 40 mm in width; the Radeon Pro 555X has no recorded dimensions.

Architecture Differences

The architectural divide between these two GPUs is fundamental. The NVIDIA GeForce GTX 1080 Ti uses the GP102 chip based on the Pascal architecture, manufactured on TSMC's 16 nm process. It packs 11,800 million transistors on a 471 mm² die, yielding a transistor density of 25.1M per mm². The AMD Radeon Pro 555X uses the Polaris 21 chip based on GCN 4.0 architecture, built on GlobalFoundries' 14 nm process. It contains 3,000 million transistors on a 123 mm² die, with a transistor density of 24.4M per mm². The die sizes and transistor counts are vastly different, but the densities are remarkably similar, indicating comparable manufacturing efficiency.

The memory architecture differs beyond just capacity and bandwidth. The GTX 1080 Ti uses GDDR5X, while the Radeon Pro 555X uses standard GDDR5. The NVIDIA card's 352-bit bus is nearly three times wider than the AMD card's 128-bit bus. This wider bus, combined with GDDR5X, explains the GTX 1080 Ti's 484.4 GB/s bandwidth, which is over five times the Radeon Pro 555X's 94.08 GB/s.

API support shows both cards support DirectX 12 and OpenGL 4.6, but with differences. The GTX 1080 Ti supports DirectX 12 (12_1) and Vulkan 1.4, while the Radeon Pro 555X supports DirectX 12 (12_0) and Vulkan 1.3. The FP16 compute capability is a notable architectural difference: the Radeon Pro 555X offers FP16 at a 1:1 ratio with FP32, meaning full-rate half-precision compute, while the GTX 1080 Ti offers FP16 at a 1:64 ratio, severely limiting half-precision throughput. This makes the Radeon Pro 555X architecturally more suited to certain compute workloads that leverage FP16, though its overall lower FP32 performance still leaves it far behind in absolute terms.

The release dates place these products in different eras: the GTX 1080 Ti launched on March 9, 2017, while the Radeon Pro 555X launched on July 15, 2018. Both are marked as end-of-life in the database. The NVIDIA card has a recorded launch MSRP of 699 USD, while the AMD card has no recorded launch MSRP. The GTX 1080 Ti's predecessor is the GeForce 900 series and its successor is the GeForce 20 series, while the Radeon Pro 555X has no recorded predecessor or successor.