AMD Instinct MI455X vs NVIDIA GeForce RTX 4070 Ti Comparison

FAQ

Q: What is the fundamental difference in architecture between these two GPUs?

A: The AMD Instinct MI455X uses the CDNA 5.0 architecture on a 2 nm TSMC process, while the NVIDIA GeForce RTX 4070 Ti uses the Ada Lovelace architecture on a 5 nm TSMC process. The MI455X is an Instinct-series accelerator with no display outputs, while the RTX 4070 Ti is a GeForce consumer card with HDMI and DisplayPort outputs.

Q: How do the memory subsystems compare?

A: The MI455X carries 432 GB of HBM4 memory across a 24576-bit bus, yielding 23.3 TB/s bandwidth. The RTX 4070 Ti has 12 GB of GDDR6X on a 192-bit bus, delivering 504.2 GB/s. The MI455X has roughly 46 times the memory capacity and 46 times the bandwidth.

Q: Which card has higher raw compute throughput?

A: The MI455X delivers 157.3 TFLOPS of FP32 and FP16 (1:1) performance. The RTX 4070 Ti provides 40.09 TFLOPS for both FP32 and FP16 (1:1). The MI455X is 3.9 times ahead in FP32 throughput.

Q: What are the power requirements for each?

A: The MI455X has a TDP of 2300 W and a suggested PSU of 2700 W, using an EAM Module slot with no power connectors. The RTX 4070 Ti has a TDP of 285 W, a suggested PSU of 600 W, and uses a single 16-pin connector.

Q: Does the MI455X support gaming APIs?

A: No. The MI455X lists DirectX as N/A, OpenGL as N/A, and Vulkan as N/A. The RTX 4070 Ti supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: How does the RTX 4070 Ti rank among all GPUs in the database?

A: The RTX 4070 Ti sits at the 84th percentile of all GPUs, with an average benchmark score of 44,795. Its nearest rival, the NVIDIA GeForce RTX 5090 Mobile, scores 45,152, which is 0.8% higher.

Architecture Differences

The AMD Instinct MI455X and NVIDIA GeForce RTX 4070 Ti come from entirely different design philosophies. The MI455X is a compute-focused accelerator built on CDNA 5.0, a data-center architecture that prioritizes massive parallel throughput over rasterization features. The RTX 4070 Ti belongs to the Ada Lovelace generation, a consumer-oriented architecture with dedicated hardware for ray tracing and tensor operations.

The process nodes reflect their respective positions. The MI455X uses TSMC's 2 nm process, packing 320,000 million transistors into a 2990 mm² die. That translates to a transistor density of 107.0M per mm². The RTX 4070 Ti uses the same foundry, TSMC, but on a larger 5 nm node, with 35,800 million transistors on a 294 mm² die. Its density is higher at 121.8M per mm², an artifact of the smaller chip and more mature design rules.

The shading core counts reveal the scale difference. The MI455X has 32,768 shading units and 1,024 texture mapping units, but zero ROPs and no ray tracing or tensor cores listed. The RTX 4070 Ti has 7,680 shading units, 240 TMUs, 80 ROPs, 60 RT cores, and 240 tensor cores. The MI455X also reports a pixel rate of 0 MPixel/s, while the RTX 4070 Ti reaches 208.8 GPixel/s.

Memory architecture diverges sharply. The MI455X features HBM4 with 432 GB capacity, a 24576-bit bus, and 23.3 TB/s bandwidth. The RTX 4070 Ti uses GDDR6X with 12 GB, a 192-bit bus, and 504.2 GB/s. Clock speeds differ as well: the MI455X runs at a 1000 MHz base and 2400 MHz boost, while the RTX 4070 Ti runs at 2310 MHz base and 2610 MHz boost. Memory clocks are 1900 MHz (7.6 Gbps effective) for the MI455X versus 1313 MHz (21 Gbps effective) for the RTX 4070 Ti.

The bus interface also separates them. The MI455X uses PCIe 6.0 x16, while the RTX 4070 Ti uses PCIe 4.0 x16. The MI455X has no display outputs; the RTX 4070 Ti offers 1x HDMI 2.1 and 3x DisplayPort 1.4a. The MI455X is an EAM Module with no power connectors, whereas the RTX 4070 Ti is a dual-slot card with a single 16-pin connector.

Head-to-Head Benchmarks

The head-to-head benchmark table in the database is empty, meaning no direct comparative tests were recorded between the MI455X and RTX 4070 Ti. However, the RTX 4070 Ti has a full set of benchmark scores that can be interpreted against its nearest rivals.

The RTX 4070 Ti's average benchmark score is 44,795. Its closest competitor, the NVIDIA GeForce RTX 5090 Mobile, posts 45,152, which is 0.8% higher. The AMD Radeon Pro 5500 XT scores 45,384, 1.3% higher than the RTX 4070 Ti. The NVIDIA RTX A6000 scores 44,075, which is 1.6% lower. The Intel Arc A730M scores 45,592, 1.7% higher.

Looking at individual benchmarks, the RTX 4070 Ti reaches 5,024 in 3DMark Steel Nomad DX12. In Geekbench OpenCL it scores 176,953 and in Geekbench Vulkan 213,808. Passmark results show 187 in DirectX 10, 288 in DirectX 11, 116 in DirectX 12, and 352 in DirectX 9. The Passmark G2D score is 1,200, while the G3D score is 31,624. The GPU compute score is 18,396.

The MI455X has no recorded benchmarks in the database, so a direct numerical comparison is impossible. Instead, the FP32 and FP16 throughput figures provide a proxy for compute potential. The MI455X's 157.3 TFLOPS in both precisions stands far above the RTX 4070 Ti's 40.09 TFLOPS. This 3.9x advantage in raw floating-point throughput aligns with the MI455X's data-center positioning.

Texture rate data also shows the MI455X's advantage. The MI455X achieves 2,457.6 GTexel/s, while the RTX 4070 Ti achieves 626.4 GTexel/s, a 3.9x difference. Pixel rate, however, favors the RTX 4070 Ti, which has 208.8 GPixel/s compared to the MI455X's 0 MPixel/s. This indicates the MI455X is not designed for rasterization output.

The RTX 4070 Ti's percentile rank of 84 places it above the majority of GPUs in the database. Its nearest rivals cluster within a 2% band, suggesting that among tested consumer and workstation cards, the RTX 4070 Ti performs competitively. The MI455X's percentile of 50 is based on zero benchmark scores, so it reflects an average placeholder rather than measured performance.

Specification Differences

The following fields differ between the AMD Instinct MI455X and NVIDIA GeForce RTX 4070 Ti:

• Architecture: CDNA 5.0 versus Ada Lovelace
• Chip: MI450 256CU versus AD104
• Generation: Instinct (MIx) versus GeForce 40
• Process node: 2 nm versus 5 nm
• Transistors: 320,000 million versus 35,800 million
• Die size: 2990 mm² versus 294 mm²
• Transistor density: 107.0M / mm² versus 121.8M / mm²
• Base clock: 1000 MHz versus 2310 MHz
• Boost clock: 2400 MHz versus 2610 MHz
• Memory clock: 1900 MHz (7.6 Gbps effective) versus 1313 MHz (21 Gbps effective)
• Memory size: 432 GB versus 12 GB
• Memory type: HBM4 versus GDDR6X
• Memory bus width: 24576 bit versus 192 bit
• Memory bandwidth: 23.3 TB/s versus 504.2 GB/s
• Shading units: 32,768 versus 7,680
• TMUs: 1,024 versus 240
• ROPs: 0 versus 80
• RT cores: none listed versus 60
• Tensor cores: none listed versus 240
• Pixel rate: 0 MPixel/s versus 208.8 GPixel/s
• Texture rate: 2,457.6 GTexel/s versus 626.4 GTexel/s
• FP32: 157.3 TFLOPS versus 40.09 TFLOPS
• FP16: 157.3 TFLOPS (1:1) versus 40.09 TFLOPS (1:1)
• TDP: 2300 W versus 285 W
• Slot width: EAM Module versus Dual-slot
• Power connectors: None versus 1x 16-pin
• Suggested PSU: 2700 W versus 600 W
• Bus interface: PCIe 6.0 x16 versus PCIe 4.0 x16
• Display outputs: No outputs versus 1x HDMI 2.1, 3x DisplayPort 1.4a
• DirectX support: N/A versus 12 Ultimate (12_2)
• OpenGL support: N/A versus 4.6
• Vulkan support: N/A versus 1.4
• Dimensions: not listed versus 285 mm length, 112 mm height, 42 mm width
• Production status: not listed versus End-of-life
• Release date: 2026-07-22 versus 2023-01-02
• Predecessor: Radeon Instinct versus GeForce 30
• Successor: none listed versus GeForce 50
• Launch MSRP: not listed versus 799 USD
• Benchmark scores: none versus ten recorded scores
• Percentile: 50 versus 84

The Verdict

The recorded data draws a clear line between these two products. The AMD Instinct MI455X is a compute accelerator with no display output, no graphics API support, and an enormous memory footprint. The NVIDIA GeForce RTX 4070 Ti is a consumer graphics card with full DirectX, OpenGL, and Vulkan support, plus ray tracing and tensor cores.

For tasks that depend on raw FP32 or FP16 throughput, the MI455X delivers 157.3 TFLOPS, which is 3.9x the RTX 4070 Ti's 40.09 TFLOPS. Its 432 GB HBM4 memory with 23.3 TB/s bandwidth dwarfs the RTX 4070 Ti's 12 GB GDDR6X at 504.2 GB/s. Texture rate follows the same pattern, with the MI455X at 2,457.6 GTexel/s versus 626.4 GTexel/s. These figures point to workloads like large model inference, scientific simulation, or high-performance computing where memory capacity and compute density matter more than pixel output.

The RTX 4070 Ti, by contrast, has a full rasterization pipeline with 80 ROPs and 208.8 GPixel/s. It supports modern graphics APIs, includes 60 RT cores for ray tracing and 240 tensor cores for AI acceleration, and fits into a dual-slot form factor with a 285 W TDP. Its benchmark scores place it at the 84th percentile, with an average of 44,795. The nearest rivals, the RTX 5090 Mobile and Radeon Pro 5500 XT, are within 1.3% higher, while the RTX A6000 is 1.6% lower.

The MI455X cannot render frames or run gaming workloads because it has no outputs and no graphics API support. The RTX 4070 Ti cannot approach the memory capacity or compute density of the MI455X. These are not competing products in the same market segment; they serve different functions.

Where Each One Wins

The AMD Instinct MI455X wins in compute-heavy scenarios. Its 157.3 TFLOPS FP32 and FP16 throughput, 432 GB HBM4 memory, and 23.3 TB/s bandwidth make it suitable for data-parallel workloads that exceed the memory limits of consumer cards. The 24576-bit memory bus and 2 nm process node support high transistor density on a 2990 mm² die. The PCIe 6.0 x16 interface also provides a newer interconnect than the RTX 4070 Ti's PCIe 4.0 x16. For any workload that requires massive memory capacity or extreme floating-point rates, the MI455X is the clear choice based on the recorded specifications.

The NVIDIA GeForce RTX 4070 Ti wins in any scenario requiring graphics output or standard API compatibility. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, and provides HDMI and DisplayPort outputs. Its 60 RT cores and 240 tensor cores enable ray tracing and AI-accelerated features that the MI455X lacks entirely. The RTX 4070 Ti also has a 208.8 GPixel/s pixel rate, whereas the MI455X reports 0 MPixel/s. Its 285 W TDP and dual-slot design make it deployable in standard desktop systems, while the MI455X requires a 2700 W PSU and an EAM Module slot.

For gaming, the RTX 4070 Ti has the only relevant data. Its 3DMark Steel Nomad score of 5,024 and Passmark G3D score of 31,624 indicate functional performance in consumer benchmarks. The MI455X has no benchmark entries, so no gaming or workstation graphics performance can be attributed to it.

The RTX 4070 Ti also has the advantage of an established release date and production status. It launched with a 799 USD MSRP, is marked End-of-life, and has a successor in GeForce 50. The MI455X has no launch MSRP, no production status, and no recorded successor. The RTX 4070 Ti's benchmark percentile of 84 versus the MI455X's 50 reflects the fact that the RTX 4070 Ti has measured performance data while the MI455X does not.

Selection depends on the workload. Compute and memory-bound tasks favor the MI455X. Graphics, rendering, and standard API workloads favor the RTX 4070 Ti.