AMD Instinct MI355X vs NVIDIA GeForce RTX 5070 Ti Mobile Comparison

Where Each One Wins

The AMD Instinct MI355X and NVIDIA GeForce RTX 5070 Ti Mobile occupy completely different segments of the hardware spectrum, and the recorded data reflects that divide. The MI355X is a compute-oriented accelerator with no display outputs, no graphics API support, and zero benchmark entries in the database. The RTX 5070 Ti Mobile, by contrast, is an active mobile graphics processor with nine recorded benchmark scores spanning DirectX, OpenCL, Vulkan, and compute workloads.

The MI355X wins on raw compute specification. Its FP32 throughput of 78.64 TFLOPS is more than 4.6 times the 17.04 TFLOPS of the RTX 5070 Ti Mobile. Texture rate tells a similar story: 2,457.6 GTexel/s versus 266.2 GTexel/s, a 9.2x gap. Memory bandwidth is even more lopsided, with 8.19 TB/s against 672.0 GB/s, roughly 12.2x higher. These are not close figures; they represent entirely different classes of hardware.

The RTX 5070 Ti Mobile wins on actual measured performance data. Its average benchmark score of 35,435 places it in the 80th percentile of all GPUs in the database, while the MI355X sits at the 50th percentile with an average score of zero due to no recorded tests. The mobile part delivers a PassMark G3D score of 24,004 and a GPU compute score of 10,101. Geekbench results show 143,870 in OpenCL and 139,213 in Vulkan. None of these numbers exist for the MI355X because no benchmarks were recorded for it.

The use-case split is straightforward. The MI355X targets compute-heavy workloads where massive memory pools and extreme bandwidth matter, such as large-scale data processing or AI training. The RTX 5070 Ti Mobile targets conventional graphics and general-purpose GPU tasks in portable systems, with full DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support. The MI355X has no graphics API support at all, listing N/A for DirectX, OpenGL, and Vulkan, and its pixel rate is recorded as 0 MPixel/s.

Architecture Differences

The two processors come from different architectural lineages. The MI355X uses CDNA 4.0, AMD's compute-focused design, built on the MI350 256CU chip. The RTX 5070 Ti Mobile uses Blackwell 2.0 on the GB205 chip. Manufacturing processes differ as well: the MI355X is fabricated on a 3 nm node at TSMC, while the RTX 5070 Ti Mobile uses a 5 nm node, also at TSMC.

Transistor counts reflect the scale difference. The MI355X packs 185,000 million transistors on a die of 2,380 mm², yielding a density of 77.7 million transistors per square millimeter. The RTX 5070 Ti Mobile contains 31,100 million transistors on a 263 mm² die, giving a higher density of 118.3 million per square millimeter. The MI355X is physically enormous by comparison, measuring 102 mm in length and 165 mm in width, and it uses an OAM Module slot format. The RTX 5070 Ti Mobile is an IGP-class part with no listed dimensions.

Memory architecture is fundamentally different. The MI355X uses 288 GB of HBM3e on an 8192-bit bus, producing 8.19 TB/s of bandwidth. The RTX 5070 Ti Mobile uses 12 GB of GDDR7 on a 192-bit bus, producing 672.0 GB/s. The MI355X runs memory at 2000 MHz with 8 Gbps effective speed, while the RTX 5070 Ti Mobile runs at 1750 MHz with 28 Gbps effective speed. The higher effective data rate of GDDR7 does not compensate for the vastly wider HBM3e interface.

Compute resources differ sharply. The MI355X has 16,384 shading units and 1,024 texture mapping units, with no ROPs listed. The RTX 5070 Ti Mobile has 5,888 shading units, 184 TMUs, and 80 ROPs. The NVIDIA part includes 46 ray tracing cores and 184 tensor cores, while the MI355X lists no RT or tensor core counts. Clock speeds also diverge: the MI355X runs at 1000 MHz base and 2400 MHz boost, whereas the RTX 5070 Ti Mobile runs at 847 MHz base and 1447 MHz boost.

Power requirements separate the two dramatically. The MI355X has a TDP of 1400 W and a suggested PSU of 1800 W, with no power connectors on the card itself. The RTX 5070 Ti Mobile has a TDP of 60 W. The MI355X produces no display outputs, while the RTX 5070 Ti Mobile's outputs are portable device dependent.

Head-to-Head Benchmarks

The database contains no shared benchmark entries between the two parts. The head-to-head benchmark list is empty, and the win counts are zero for both sides. Direct numerical comparison must therefore come from the individual data recorded for each product.

The MI355X's advantage appears entirely in specification-level figures. Its 78.64 TFLOPS FP32 output is 4.6x the RTX 5070 Ti Mobile's 17.04 TFLOPS. Texture rate of 2,457.6 GTexel/s versus 266.2 GTexel/s shows a 9.2x lead. Memory bandwidth of 8.19 TB/s versus 672.0 GB/s is a 12.2x advantage. The 288 GB memory capacity is 24x the 12 GB on the mobile part. These are the numbers that define the MI355X's role as a high-bandwidth compute accelerator.

The RTX 5070 Ti Mobile's advantage appears in measured workload performance. Its average benchmark score of 35,435 places it near the NVIDIA Quadro GV100, which scores 35,520 with a delta of -0.2%. It sits ahead of the AMD Radeon Pro Duo, which scores 35,860 with a delta of -1.2%, and ahead of the NVIDIA T1000, which scores 36,289 with a delta of -2.4%. The only rival it trails is the NVIDIA A2, which scores 34,690 with a delta of +2.1%. These deltas are small, indicating the RTX 5070 Ti Mobile sits in a tightly clustered performance band among its nearest rivals.

Individual test scores for the RTX 5070 Ti Mobile show its strongest results in OpenCL and Vulkan compute. The Geekbench OpenCL score of 143,870 exceeds the Vulkan score of 139,213 by about 3.3%. PassMark results are more modest: DirectX 9 scores 259, DirectX 11 scores 237, DirectX 10 scores 151, and DirectX 12 scores 102. The 2D score is 981, while the 3D score is 24,004. GPU compute in PassMark reaches 10,101. The spread between the 3D score and the compute score indicates the part's compute performance is a smaller fraction of its peak than its graphics performance, relative to the broader database.

The MI355X's percentile ranking of 50 with zero average score comes from having no recorded benchmark entries. The RTX 5070 Ti Mobile's 80th percentile ranking comes from its measured scores. The data does not support a direct performance comparison, only a comparison of what each part is designed to do and what measurements exist for it.

The Verdict

The data indicates two products built for different purposes, and the choice between them depends entirely on workload type. The MI355X is a 1400 W OAM module with 288 GB of HBM3e memory and 8.19 TB/s of bandwidth. It targets compute environments where memory capacity and bandwidth dominate, and it offers no graphics output and no graphics API support. The RTX 5070 Ti Mobile is a 60 W mobile processor with full graphics API support, 46 ray tracing cores, and 184 tensor cores, and it has recorded benchmark scores across multiple test suites.

For workloads that require massive memory pools, extreme bandwidth, and raw FP32 throughput, the MI355X is the only option between the two. Its 78.64 TFLOPS and 8.19 TB/s are unmatched by the mobile part. For any workload that requires graphics rendering, DirectX 12 Ultimate support, or measured benchmark validation, the RTX 5070 Ti Mobile is the functional choice. The MI355X cannot render frames, cannot run Vulkan or OpenGL, and has no recorded performance data.

The RTX 5070 Ti Mobile's 80th percentile ranking versus the MI355X's 50th percentile ranking reflects data availability rather than capability, but the practical implication is clear. The mobile part has validated performance in real workloads. The MI355X has specification superiority but no measured results in the database. Users needing a working GPU with proven scores should select the RTX 5070 Ti Mobile. Users needing a compute accelerator with enormous memory and bandwidth should select the MI355X, accepting that its performance is unverified in the recorded data.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI355X delivers 78.64 TFLOPS FP32, which is 4.6x the 17.04 TFLOPS of the NVIDIA GeForce RTX 5070 Ti Mobile.

Q: How much memory does each GPU have?

A: The MI355X has 288 GB of HBM3e on an 8192-bit bus with 8.19 TB/s bandwidth. The RTX 5070 Ti Mobile has 12 GB of GDDR7 on a 192-bit bus with 672.0 GB/s bandwidth.

Q: What benchmark scores are recorded for the RTX 5070 Ti Mobile?

A: The database lists nine scores: Geekbench OpenCL 143,870, Geekbench Vulkan 139,213, PassMark DirectX 9 259, DirectX 10 151, DirectX 11 237, DirectX 12 102, G2D 981, G3D 24,004, and GPU compute 10,101.

Q: Are there any recorded benchmarks for the MI355X?

A: No. The MI355X has zero benchmark entries, an average benchmark score of 0, and a 50th percentile ranking in the database.

Q: What is the power consumption of each part?

A: The MI355X has a TDP of 1400 W and a suggested PSU of 1800 W. The RTX 5070 Ti Mobile has a TDP of 60 W.

Q: Which GPU supports ray tracing?

A: The RTX 5070 Ti Mobile includes 46 ray tracing cores. The MI355X lists no ray tracing core count.

Q: What graphics APIs does each GPU support?

A: The RTX 5070 Ti Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI355X lists N/A for DirectX, OpenGL, and Vulkan.