AMD Instinct MI300 vs NVIDIA GeForce RTX 5080 Mobile Comparison

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark entries for the AMD Instinct MI300 and the NVIDIA GeForce RTX 5080 Mobile. This absence is itself informative: the two parts occupy entirely different measurement domains. The Instinct MI300 has no recorded benchmark scores at all, with an average benchmark score of zero and a percentile rank of 50 among all GPUs. The RTX 5080 Mobile, by contrast, carries ten recorded benchmark results, an average score of 38,349, and a percentile rank of 81.

The RTX 5080 Mobile’s recorded scores span several test suites. In 3DMark Steel Nomad DX12, it scores 4,952. Geekbench results show 166,986 in OpenCL and 169,754 in Vulkan. Passmark tests deliver 27,711 in G3D, 12,134 in GPU Compute, and lower figures in legacy DirectX tests: 314 in DirectX 9, 253 in DirectX 11, 171 in DirectX 10, and 116 in DirectX 12. The Passmark G2D score is 1,095.

Since the Instinct MI300 has no benchmark entries, the comparison must rely on its nearest rival data, which is also empty. The RTX 5080 Mobile, however, has four nearest rivals with explicit deltas. The GeForce MX570 sits 0.1% ahead of the RTX 5080 Mobile with an average score of 38,299. The RTX 4080 Mobile trails by 0.6% with 38,135. The MX570 A leads by 0.9% at 38,691, and the AMD Radeon Pro 580X also leads by 0.9% at 38,706. These deltas are exceptionally tight, indicating the RTX 5080 Mobile’s average score clusters within a single percentage point of four different products.

The lack of MI300 benchmarks means no win count can be assigned. WinsA and winsB both stand at zero in the database. The interpretation is straightforward: measured performance exists only for the RTX 5080 Mobile, while the MI300 remains an unmeasured entry in this dataset.

FAQ

Q: What is the average benchmark score for each GPU?

A: The RTX 5080 Mobile has an average benchmark score of 38,349. The Instinct MI300 has an average benchmark score of 0, with no benchmark entries recorded.

Q: How does the RTX 5080 Mobile compare to its closest rivals?

A: The RTX 5080 Mobile’s average score of 38,349 is 0.1% behind the GeForce MX570 (38,299), 0.6% ahead of the RTX 4080 Mobile (38,135), 0.9% behind the MX570 A (38,691), and 0.9% behind the Radeon Pro 580X (38,706).

Q: What is the percentile ranking of each GPU?

A: The RTX 5080 Mobile ranks in the 81st percentile among all GPUs. The Instinct MI300 ranks in the 50th percentile.

Q: Which GPU has higher FP32 compute?

A: The Instinct MI300 delivers 47.87 TFLOPS FP32, while the RTX 5080 Mobile delivers 23.04 TFLOPS FP32. The MI300 is more than double the mobile part in this metric.

Q: What are the memory capacities and types?

A: The Instinct MI300 has 128 GB of HBM3 memory with a 8192-bit bus and 5.32 TB/s bandwidth. The RTX 5080 Mobile has 16 GB of GDDR7 memory with a 256-bit bus and 896.0 GB/s bandwidth.

Q: Do both GPUs support the same APIs?

A: No. The RTX 5080 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The Instinct MI300 lists N/A for DirectX, OpenGL, and Vulkan, and has no display outputs.

Architecture Differences

The two processors come from different architectural lineages. The Instinct MI300 uses CDNA 3.0 architecture with the Aqua Vanjaram chip, belonging to the Instinct (MIx) generation. The RTX 5080 Mobile uses Blackwell 2.0 architecture with the GB203 chip, part of the GeForce 50-series and GeForce 50 Mobile generation. Both are fabricated on a 5 nm process at TSMC, but the transistor counts diverge sharply: the MI300 packs 153,000 million transistors on a 1017 mm² die, while the RTX 5080 Mobile has 45,600 million transistors on a 378 mm² die. This yields transistor densities of 150.4M per mm² for the MI300 and 120.6M per mm² for the RTX 5080 Mobile.

The MI300’s compute layout is heavily weighted toward shading and texturing. It has 14,080 shading units, 880 texture mapping units, and zero ROPs. Its pixel rate is recorded as 0 MPixel/s, and its texture rate is 1,496.0 GTexel/s. The RTX 5080 Mobile has 7,680 shading units, 240 TMUs, and 96 ROPs. Its pixel rate is 144.0 GPixel/s, and its texture rate is 360.0 GTexel/s. The MI300 lacks dedicated ray tracing cores and tensor cores in the database, while the RTX 5080 Mobile carries 60 RT cores and 240 tensor cores.

Architectural feature sets also differ. The MI300 reports N/A for DirectX, OpenGL, and Vulkan support, and has no display outputs. The RTX 5080 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, with display outputs described as portable device dependent. The MI300’s power delivery requires 2x 8-pin connectors and a suggested 1000 W PSU. The RTX 5080 Mobile, as an integrated graphics processor (IGP), uses no power connectors and lists no suggested PSU.

Clock behavior separates the two as well. The MI300 has a base clock of 1000 MHz and a boost clock of 1700 MHz, with memory running at 1300 MHz (5.2 Gbps effective). The RTX 5080 Mobile has a base clock of 975 MHz and a boost clock of 1500 MHz, with memory at 1750 MHz (28 Gbps effective). The FP16 figures mirror FP32 for both: 47.87 TFLOPS for the MI300 and 23.04 TFLOPS for the RTX 5080 Mobile, both at a 1:1 ratio.

Specification Differences

The two GPUs differ across nearly every recorded specification field. Process node is identical at 5 nm TSMC, and both use PCIe 5.0 x16 interfaces, but almost everything else diverges. The MI300 measures 267 mm in length and 111 mm in height; the RTX 5080 Mobile has no recorded dimensions.

Memory is a major differentiator. The MI300 has 128 GB of HBM3 with an 8192-bit bus and 5.32 TB/s bandwidth. The RTX 5080 Mobile has 16 GB of GDDR7 with a 256-bit bus and 896.0 GB/s bandwidth. The MI300’s memory clock is 1300 MHz (5.2 Gbps effective), while the RTX 5080 Mobile runs at 1750 MHz (28 Gbps effective).

Compute resources differ in scale. Shading units: 14,080 vs 7,680. TMUs: 880 vs 240. ROPs: 0 vs 96. RT cores: none vs 60. Tensor cores: none vs 240. Pixel rate: 0 MPixel/s vs 144.0 GPixel/s. Texture rate: 1,496.0 GTexel/s vs 360.0 GTexel/s. FP32 and FP16 both read 47.87 TFLOPS for the MI300 and 23.04 TFLOPS for the RTX 5080 Mobile.

Power figures differ enormously. The MI300 has a TDP of 600 W, while the RTX 5080 Mobile uses 80 W. The MI300’s power connectors are 2x 8-pin, with a suggested PSU of 1000 W. The RTX 5080 Mobile has no power connectors and no suggested PSU, listed as an IGP. The MI300 has no display outputs; the RTX 5080 Mobile has portable device dependent outputs. The MI300 lists N/A for DirectX, OpenGL, and Vulkan; the RTX 5080 Mobile supports all three.

Release timing differs. The MI300 launched on 2023-01-03, while the RTX 5080 Mobile launched on 2025-04-01. The MI300’s predecessor is the Radeon Instinct; the RTX 5080 Mobile’s predecessor is the GeForce 40 Mobile. The RTX 5080 Mobile has a production status of Active; the MI300 has none recorded. Transistors and die size also separate them, as noted previously.

The Verdict

The recorded data draws a clear distinction. The RTX 5080 Mobile is a measured, shipping product with ten benchmark scores, an 81st percentile ranking, and an average score of 38,349, placing it within 0.9% of four rival GPUs. The Instinct MI300 has no benchmarks, no average score, and sits at the 50th percentile with zero recorded wins. The MI300’s raw compute specifications vastly exceed the RTX 5080 Mobile: 47.87 TFLOPS FP32 versus 23.04, 128 GB HBM3 versus 16 GB GDDR7, and 5.32 TB/s bandwidth versus 896.0 GB/s. Yet none of that translates into a measurable benchmark score in this database.

The RTX 5080 Mobile is the only one of the two with evidence of real-world performance. Its cluster of nearest rivals, all within a single percentage point, indicates that its average score is consistent with a mid-range mobile GPU tier. The MI300, by contrast, appears as a high-specification part without performance validation. The data suggests the RTX 5080 Mobile is the appropriate choice for environments where measured graphical output matters, while the MI300’s role remains undefined in benchmark terms.

Where Each One Wins

The RTX 5080 Mobile wins in every category where measured data exists. It has benchmark scores across 3DMark, Geekbench, and Passmark, a percentile rank of 81, an average score of 38,349, and a production status of Active. It supports modern APIs, includes RT and tensor cores, has display outputs, and operates at 80 W with no external power connectors. For any use case requiring verified performance, the RTX 5080 Mobile is the only option with evidence.

The Instinct MI300 wins on raw specification sheets. It has more than double the FP32 throughput, eight times the memory capacity, nearly six times the memory bandwidth, a wider memory bus, a larger die, more transistors, and higher clock speeds. Its 600 W TDP and 1000 W PSU requirement indicate a part designed for sustained heavy compute, but the database contains no benchmark results to confirm how that translates into actual performance. The MI300’s 50th percentile ranking, with no adjacent rivals, leaves its competitive position unresolved.

The use-case split follows the evidence. For portable, consumer-facing graphics with recorded results, the RTX 5080 Mobile is the clear pick. For a server-class accelerator with massive memory and compute specifications but no measured scores, the MI300 is the only choice, though its performance remains unverified in this dataset.