AMD Instinct MI308X vs NVIDIA GeForce RTX 4080 Mobile Comparison

The AMD Instinct MI308X and the NVIDIA GeForce RTX 4080 Mobile occupy opposite ends of the hardware spectrum within their respective product lines. The MI308X is a server-grade accelerator designed for massive compute workloads, while the RTX 4080 Mobile is a laptop GPU built for gaming and portable rendering. The recorded data shows a fundamental split in capabilities, with the MI308X holding advantages in raw compute throughput and memory capacity, while the RTX 4080 Mobile holds the advantage in application compatibility and graphics API support. This analysis relies exclusively on the database records for both products, including their architecture specifications, clock speeds, memory configurations, and benchmark results where available.

Where Each One Wins

The NVIDIA GeForce RTX 4080 Mobile wins in every measurable benchmark category recorded in the database. It achieves a Geekbench OpenCL score of 159,575 and a Geekbench Vulkan score of 145,807. In PassMark testing, it scores 24,926 in the G3D test, 11,191 in the GPU Compute test, 929 in the G2D test, and 286 in the DirectX 9 test. The RTX 4080 Mobile also records scores of 244 in DirectX 11, 157 in DirectX 10, and 96 in DirectX 12. Its average benchmark score across all recorded tests is 38,135, placing it in the 81st percentile of all GPUs in the database. The AMD Instinct MI308X has no recorded benchmark scores, an average benchmark score of 0, and sits in the 50th percentile of all GPUs. The database also shows zero wins for the MI308X and zero wins for the RTX 4080 Mobile in head-to-head comparisons, but with no benchmark data for the MI308X, the RTX 4080 Mobile stands as the only product with verified performance measurements.

The RTX 4080 Mobile also wins in graphics API support. It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI308X lists its DirectX, OpenGL, and Vulkan APIs as "N/A", meaning it has no graphics API compatibility in the traditional sense. This is a decisive split: the RTX 4080 Mobile can run gaming and graphics applications directly, while the MI308X cannot. The RTX 4080 Mobile also has display outputs listed as "Portable Device Dependent", meaning it can drive displays in a laptop context. The MI308X lists "No outputs", confirming it is a compute-only accelerator with no display capability. The MI308X wins in raw specifications that matter for compute workloads. Its FP32 throughput is 81.72 TFLOPS, compared to 24.72 TFLOPS for the RTX 4080 Mobile. The MI308X also holds a massive memory advantage with 192 GB of HBM3 memory on an 8192-bit bus, delivering 5.32 TB/s of bandwidth. The RTX 4080 Mobile has 12 GB of GDDR6 memory on a 192-bit bus, delivering 432.0 GB/s. The MI308X also has more shading units (19,456 vs 7,424), more texture mapping units (1,216 vs 232), and a higher texture rate (2,553.6 GTexel/s vs 386.3 GTexel/s). These numbers indicate that the MI308X is built for sustained, high-throughput compute, while the RTX 4080 Mobile is built for interactive graphics.

Architecture Differences

The architectural split between these two products is stark. The AMD Instinct MI308X uses the CDNA 3.0 architecture with the Aqua Vanjaram chip, fabricated on a 5 nm process at TSMC. The NVIDIA GeForce RTX 4080 Mobile uses the Ada Lovelace architecture with the AD104 chip, also fabricated on a 5 nm process at TSMC. Both share the same process node and foundry, but the similarities end there. The MI308X packs 153,000 million transistors into a 1017 mm² die, yielding a transistor density of 150.4 million per mm². The RTX 4080 Mobile contains 35,800 million transistors on a 294 mm² die, giving it a transistor density of 121.8 million per mm². The MI308X has over four times the transistor count and more than three times the die area.

Clock speeds also differ significantly. The MI308X has a base clock of 1000 MHz and a boost clock of 2100 MHz. The RTX 4080 Mobile has a base clock of 1290 MHz and a boost clock of 1665 MHz. The MI308X boosts 435 MHz higher than the RTX 4080 Mobile, but the RTX 4080 Mobile runs a higher base clock. Memory clocks differ as well: the MI308X runs its HBM3 memory at 1300 MHz with 5.2 Gbps effective speed, while the RTX 4080 Mobile runs its GDDR6 memory at 2250 MHz with 18 Gbps effective speed. The RTX 4080 Mobile has a substantially faster memory clock, but the MI308X compensates with a much wider memory bus and higher total bandwidth.

The RTX 4080 Mobile includes 58 ray tracing cores and 232 tensor cores, features that are absent from the MI308X record. The MI308X lists no ray tracing cores and no tensor cores. The RTX 4080 Mobile also has 80 ROPs and a pixel rate of 133.2 GPixel/s, while the MI308X lists 0 ROPs and a pixel rate of 0 MPixel/s. The MI308X has no display outputs, supports no graphics APIs, and uses an OAM Module slot width. The RTX 4080 Mobile is an IGP (integrated graphics processor) with portable device dependent display outputs and full graphics API support. Power consumption differs dramatically: the MI308X has a TDP of 750 W and a suggested PSU of 1150 W, while the RTX 4080 Mobile has a TDP of 110 W. The MI308X uses PCIe 5.0 x16, while the RTX 4080 Mobile uses PCIe 4.0 x16. Release dates also differ: the MI308X launched on December 5, 2023, while the RTX 4080 Mobile launched on January 2, 2023. The MI308X belongs to the Instinct (MIx) generation, while the RTX 4080 Mobile belongs to the GeForce 40 Mobile generation. The predecessor of the MI308X is Radeon Instinct, and the predecessor of the RTX 4080 Mobile is GeForce 30 Mobile, with its successor listed as GeForce 50 Mobile.

The Verdict

The data indicates that the AMD Instinct MI308X and NVIDIA GeForce RTX 4080 Mobile are not direct competitors, and a user should select based on workload requirements rather than raw performance comparison. For compute-heavy tasks that require massive memory capacity and high FP32 throughput, the MI308X is the only option with 192 GB of HBM3 memory, 5.32 TB/s of bandwidth, and 81.72 TFLOPS of FP32 performance. It also supports PCIe 5.0 x16, which provides a newer bus interface than the RTX 4080 Mobile's PCIe 4.0 x16. However, the MI308X has no display outputs, no graphics API support, and no recorded benchmark scores, making it unsuitable for any graphics or gaming workload.

For gaming, graphics rendering, and any application that requires DirectX, OpenGL, or Vulkan support, the RTX 4080 Mobile is the only viable choice. It has full graphics API support, 58 ray tracing cores, 232 tensor cores, and display outputs. Its benchmark results confirm it performs well in the 81st percentile of all GPUs in the database. The RTX 4080 Mobile also has a much lower TDP of 110 W, making it suitable for laptop integration, whereas the MI308X demands 750 W and an OAM Module form factor, which is not portable. The RTX 4080 Mobile's nearest rivals in the database include the NVIDIA GeForce MX570, which scores 38,299 and is 0.4% ahead of the RTX 4080 Mobile, and the NVIDIA GeForce RTX 5080 Mobile, which scores 38,349 and is 0.6% ahead. The NVIDIA GeForce RTX 4070 scores 37,648 and is 1.3% behind, and the NVIDIA Tesla P4 scores 37,628 and is 1.3% behind. These deltas are small, indicating the RTX 4080 Mobile sits in a tightly clustered performance band.

The MI308X has no nearest rivals listed and no benchmark scores, so its relative performance cannot be quantified against other accelerators. The verdict is straightforward: pick the MI308X for high-capacity compute tasks that do not require graphics output or API compatibility, and pick the RTX 4080 Mobile for graphics, gaming, and portable workloads. The two products serve different markets, and the data does not support a single winner across all categories.

FAQ

Q: Which GPU has higher FP32 compute throughput?

A: The AMD Instinct MI308X has 81.72 TFLOPS of FP32 performance, compared to 24.72 TFLOPS for the NVIDIA GeForce RTX 4080 Mobile.

Q: Does the AMD Instinct MI308X support DirectX or Vulkan?

A: No. The MI308X lists its DirectX, OpenGL, and Vulkan APIs as "N/A". The RTX 4080 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: What is the memory capacity difference between the two GPUs?

A: The MI308X has 192 GB of HBM3 memory on an 8192-bit bus with 5.32 TB/s bandwidth. The RTX 4080 Mobile has 12 GB of GDDR6 memory on a 192-bit bus with 432.0 GB/s bandwidth.

Q: Which GPU has a higher average benchmark score?

A: The RTX 4080 Mobile has an average benchmark score of 38,135 and sits in the 81st percentile of all GPUs. The MI308X has an average benchmark score of 0 and sits in the 50th percentile.

Q: What are the power requirements for each GPU?

A: The MI308X has a TDP of 750 W and a suggested PSU of 1150 W. The RTX 4080 Mobile has a TDP of 110 W and no suggested PSU listed.

Q: Which GPU includes ray tracing and tensor cores?

A: The RTX 4080 Mobile includes 58 ray tracing cores and 232 tensor cores. The MI308X lists no ray tracing cores and no tensor cores.

Head-to-Head Benchmarks

The database records no head-to-head benchmark entries between the AMD Instinct MI308X and the NVIDIA GeForce RTX 4080 Mobile, and the MI308X has no individual benchmark scores. This means the only measurable performance data comes from the RTX 4080 Mobile. In Geekbench OpenCL, the RTX 4080 Mobile scores 159,575, and in Geekbench Vulkan, it scores 145,807. These are the two highest scores in its recorded benchmark set. In PassMark testing, the RTX 4080 Mobile scores 24,926 in G3D, which is the primary graphics performance metric, and 11,191 in GPU Compute, which measures compute workloads. The G2D score is 929, and the DirectX 9 score is 286. The DirectX 11 score is 244, the DirectX 10 score is 157, and the DirectX 12 score is 96. These scores show a pattern where older DirectX versions score higher in raw PassMark terms, but the Geekbench OpenCL and Vulkan scores are substantially higher overall.

The MI308X has no comparable benchmark data, so no direct numerical comparison is possible. However, the specification differences provide context. The MI308X has 19,456 shading units versus 7,424 for the RTX 4080 Mobile, and 1,216 TMUs versus 232. The texture rate for the MI308X is 2,553.6 GTexel/s, while the RTX 4080 Mobile achieves 386.3 GTexel/s. The MI308X also has a memory bandwidth of 5.32 TB/s, which is over 12 times the 432.0 GB/s of the RTX 4080 Mobile. These numbers indicate that the MI308X is designed for throughput-heavy compute tasks, while the RTX 4080 Mobile is optimized for graphics rendering with its 80 ROPs and 133.2 GPixel/s pixel rate, features the MI308X lacks entirely. The RTX 4080 Mobile's nearest rivals in the database include the NVIDIA GeForce MX570 with an average score of 38,299 and a delta of -0.4%, and the NVIDIA GeForce RTX 5080 Mobile with an average score of 38,349 and a delta of -0.6%. The NVIDIA GeForce RTX 4070 scores 37,648 with a delta of 1.3%, and the NVIDIA Tesla P4 scores 37,628 with a delta of 1.3%. These comparisons show the RTX 4080 Mobile is competitive with other mobile and desktop GPUs in its score range, with deltas under 2% in either direction.

The release timeline also differs. The RTX 4080 Mobile launched on January 2, 2023, and its successor is listed as GeForce 50 Mobile. The MI308X launched on December 5, 2023, and has no successor listed. The MI308X remains in the Instinct (MIx) generation with no production status recorded, while the RTX 4080 Mobile is marked as "Active" in production. The lack of benchmark data for the MI308X is notable, but the specification sheet still provides a clear picture of its intended role: a high-power, high-memory accelerator with no graphics output. The RTX 4080 Mobile, by contrast, is a fully featured graphics processor with verified performance scores across multiple benchmark suites. The database shows only one unit with measurable performance, so the head-to-head comparison is limited to specification-based analysis rather than score-based comparison.