AMD Instinct MI350X vs AMD Radeon RX 9070 XT Comparison

FAQ

Q: What are the core architectural generations of the AMD Instinct MI350X and the AMD Radeon RX 9070 XT?

A: The Instinct MI350X uses the CDNA 4.0 architecture, while the Radeon RX 9070 XT is built on RDNA 4.0. These represent separate design lineages, with CDNA aimed at compute and RDNA aimed at graphics rendering.

Q: How do the memory subsystems differ between these two AMD accelerators?

A: The MI350X features 288 GB of HBM3e memory on an 8192-bit bus, delivering 8.19 TB/s of bandwidth. The RX 9070 XT uses 16 GB of GDDR6 on a 256-bit bus, providing 644.6 GB/s. The memory capacity difference is substantial at 272 GB.

Q: What is the process node and die size difference between the two chips?

A: The MI350X is fabricated on a 3 nm process at TSMC with a die size of 2380 mm². The RX 9070 XT uses a 4 nm TSMC process with a die size of 357 mm². The MI350X die is significantly larger, and it packs 185,000 million transistors versus 53,900 million.

Q: Does the Instinct MI350X support standard graphics APIs?

A: No. The recorded data lists DirectX, OpenGL, and Vulkan support as N/A for the MI350X. In contrast, the RX 9070 XT supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, and it has display outputs including 1x HDMI 2.1b and 3x DisplayPort 2.1a.

Q: What is the thermal design power and power connector setup for each card?

A: The MI350X has a TDP of 1000 W with no power connectors, as it is an OAM module. The RX 9070 XT has a TDP of 304 W and uses 2x 8-pin power connectors, with a suggested PSU of 700 W compared to the MI350X's suggested PSU of 1400 W.

Q: What do the benchmark scores show for the RX 9070 XT?

A: The RX 9070 XT has an average benchmark score of 13543 across its recorded tests. Its best performance comes from the Geekbench Vulkan test at 65879, and it also scores 17428 in Geekbench OpenCL and 26795 in Passmark G3D. It holds a 55th percentile ranking among all GPUs in the database.

Architecture Differences

The AMD Instinct MI350X and AMD Radeon RX 9070 XT diverge sharply in their architectural foundations, reflecting different mission profiles. The MI350X is built on CDNA 4.0, an architecture designed for data center compute workloads, while the RX 9070 XT uses RDNA 4.0, a graphics-oriented architecture. This fundamental split influences nearly every design decision.

The MI350X chip, designated MI350 256CU, contains 16384 shading units and 1024 texture mapping units. It has no raster operation pipelines, as its pixel rate is recorded as 0 MPixel/s. The RX 9070 XT, based on the Navi 48 chip, has 4096 shading units, 256 TMUs, and 128 ROPs, with a pixel rate of 380.2 GPixel/s. The RX 9070 XT also includes 64 ray tracing cores, a feature absent from the MI350X data.

Transistor counts reveal the scale difference: the MI350X integrates 185,000 million transistors on a 2380 mm² die, while the RX 9070 XT contains 53,900 million on 357 mm². The transistor density differs as well, with the MI350X at 77.7M per mm² and the RX 9070 XT at 151.0M per mm², indicating the RDNA part packs transistors more tightly. The MI350X uses a 3 nm process, one step ahead of the RX 9070 XT's 4 nm node, both from TSMC.

Clock behavior also separates these designs. The MI350X runs at a 1000 MHz base clock with a 2200 MHz boost. The RX 9070 XT starts at 1660 MHz base, reaches 2400 MHz in game mode, and boosts to 2970 MHz. The RX 9070 XT's higher clock speeds suit graphics workloads that benefit from rapid instruction execution, while the MI350X prioritizes parallel throughput across its larger compute array.

Memory architecture reinforces the divergence. The MI350X deploys HBM3e across 288 GB with an 8192-bit interface and 8.19 TB/s bandwidth. The RX 9070 XT uses GDDR6 with 16 GB capacity on a 256-bit bus. The MI350X's memory design targets massive data sets and bandwidth-hungry compute kernels, while the RX 9070 XT's smaller pool serves frame buffer demands for gaming and rendering.

Feature sets differ entirely. The MI350X is an OAM module with no display outputs, no power connectors, and no supported graphics APIs. The RX 9070 XT is a dual-slot card with 2x 8-pin power connectors, HDMI 2.1b and DisplayPort 2.1a outputs, and full API support including DirectX 12 Ultimate and Vulkan 1.4. The RX 9070 XT also reports a production status of Active, while the MI350X's status is not recorded.

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark comparisons between the AMD Instinct MI350X and the AMD Radeon RX 9070 XT. The MI350X has no recorded benchmark scores and an average benchmark score of 0, while the RX 9070 XT has a full suite of recorded results. This absence of overlapping measurements makes a direct numerical comparison impossible from the recorded data.

The RX 9070 XT's benchmark results provide its performance profile. In 3DMark Steel Nomad DX12, it scores 7260. Geekbench OpenCL returns 17428, and Geekbench Vulkan delivers 65879, the highest single-test result. Passmark tests show a G3D score of 26795, a GPU compute score of 15864, and legacy DirectX results ranging from 78 in DirectX 12 to 353 in DirectX 9. The G2D score sits at 1328.

The MI350X's lack of benchmarks reflects its target environment. As a compute accelerator with no graphics API support, it does not run the same test suite as a consumer graphics card. Its percentile ranking of 50 among all GPUs with an average score of 0 indicates it falls outside the standard benchmarking pipeline for graphics hardware.

Given the missing comparative data, the head-to-head analysis relies on architectural and specification differences rather than direct score deltas. The RX 9070 XT's nearest rivals in the database are the AMD Radeon HD 7770M with an average score of 13536, the NVIDIA GeForce GTX 570 at 13515, the NVIDIA P106-090 at 13470, and the AMD Radeon Pro 555 at 13407. The RX 9070 XT leads these by 0.1%, 0.2%, 0.5%, and 1% respectively, a narrow margin that places it in a tightly grouped performance band.

The compute capability numbers offer the clearest quantitative separation. The MI350X delivers 72.09 TFLOPS FP32 and 72.09 TFLOPS FP16 (1:1). The RX 9070 XT provides 48.66 TFLOPS FP32 and 48.66 TFLOPS FP16 (1:1). The MI350X leads by roughly 48% in raw floating-point throughput, a substantial advantage for compute-heavy workloads. Texture rate favors the MI350X as well, at 2,252.8 GTexel/s versus 760.3 GTexel/s.

Memory bandwidth shows an even larger gap. The MI350X's 8.19 TB/s dwarfs the RX 9070 XT's 644.6 GB/s, a difference of more than 12 times. For data movement-intensive applications, this bandwidth advantage is the defining characteristic of the MI350X.

Specification Differences

The two AMD products differ across nearly every recorded specification field. The process node differs by one step: the MI350X uses 3 nm while the RX 9070 XT uses 4 nm. Transistor count differs by 131,100 million, with the MI350X at 185,000 million and the RX 9070 XT at 53,900 million. Die size differs by 2023 mm², with the MI350X at 2380 mm² and the RX 9070 XT at 357 mm².

Clock speeds diverge completely. The MI350X has a 1000 MHz base and 2200 MHz boost, while the RX 9070 XT has 1660 MHz base, 2400 MHz game clock, and 2970 MHz boost. Memory clocks differ as well: the MI350X runs at 2000 MHz with 8 Gbps effective, while the RX 9070 XT runs at 2518 MHz with 20.1 Gbps effective.

Memory specifications show the largest gap. The MI350X has 288 GB of HBM3e, while the RX 9070 XT has 16 GB of GDDR6. Bus width differs by 7936 bits, with the MI350X at 8192 bit and the RX 9070 XT at 256 bit. Bandwidth differs by 7.55 TB/s, with the MI350X at 8.19 TB/s and the RX 9070 XT at 644.6 GB/s.

Compute unit counts differ significantly. The MI350X has 16384 shading units versus 4096, 1024 TMUs versus 256, and no ROPs versus 128. The RX 9070 XT has 64 ray tracing cores, which the MI350X lacks. Pixel rate is 0 MPixel/s for the MI350X and 380.2 GPixel/s for the RX 9070 XT. Texture rate is 2,252.8 GTexel/s for the MI350X and 760.3 GTexel/s for the RX 9070 XT.

Power requirements rank the MI350X as a data center part. Its TDP is 1000 W with a suggested PSU of 1400 W, and it uses an OAM Module slot width with no power connectors. The RX 9070 XT has a 304 W TDP, a 700 W suggested PSU, dual-slot width, and 2x 8-pin power connectors. The MI350X measures 102 mm in length and 165 mm in width, while the RX 9070 XT has no recorded dimensions.

API support and display outputs are exclusive to the RX 9070 XT. It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, with 1x HDMI 2.1b and 3x DisplayPort 2.1a outputs. The MI350X lists N/A for all APIs and no display outputs. Release dates differ, with the RX 9070 XT released on 2025-03-05 and the MI350X on 2025-06-11. The RX 9070 XT has a launch MSRP of 599 USD.

Where Each One Wins

The AMD Instinct MI350X wins decisively in raw compute throughput. Its FP32 performance of 72.09 TFLOPS exceeds the RX 9070 XT's 48.66 TFLOPS by approximately 48%. FP16 performance follows the same pattern, with both cards offering 1:1 ratios. Texture rate also favors the MI350X, delivering 2,252.8 GTexel/s compared to 760.3 GTexel/s, roughly three times the throughput.

Memory capacity and bandwidth give the MI350X another clear victory. With 288 GB of HBM3e and 8.19 TB/s bandwidth, it handles workloads that require massive in-memory data sets. The RX 9070 XT's 16 GB and 644.6 GB/s serve conventional graphics workloads but cannot approach the MI350X's data handling envelope. The MI350X's 8192-bit bus width, 32 times wider than the RX 9070 XT's 256-bit bus, underpins this advantage.

The RX 9070 XT wins in graphics-specific capabilities. It has 128 ROPs and a pixel rate of 380.2 GPixel/s, while the MI350X has zero ROPs and a 0 MPixel/s pixel rate. The RX 9070 XT includes 64 ray tracing cores, enabling hardware-accelerated ray tracing that the MI350X cannot perform. Its API support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 makes it functional for gaming and graphics applications, while the MI350X has no API support.

Clock speeds favor the RX 9070 XT in execution speed per core. Its 2970 MHz boost clock exceeds the MI350X's 2200 MHz by a wide margin, and its 2400 MHz game clock provides sustained performance in graphics scenarios. The RX 9070 XT also wins on power efficiency per unit of compute, with a 304 W TDP versus the MI350X's 1000 W, though the MI350X delivers more total throughput.

The RX 9070 XT wins in the benchmark domain because it has recorded results. Its average benchmark score of 13543 places it at the 55th percentile among all GPUs, with a strong Geekbench Vulkan score of 65879. The MI350X has no benchmark scores, ranking at the 50th percentile with an average of 0, effectively unmeasured in graphics benchmarks.

The Verdict

The recorded data shows two AMD accelerators with complementary, not competing, roles. The Instinct MI350X is a compute accelerator built for data center workloads that demand massive memory capacity and bandwidth. Its 288 GB HBM3e pool, 8.19 TB/s bandwidth, and 72.09 TFLOPS FP32 throughput position it for large-scale compute tasks. Its lack of display outputs, graphics APIs, and ROPs confirms it is not a graphics card.

The Radeon RX 9070 XT is a graphics card with a complete feature set for rendering and gaming. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, has 64 ray tracing cores, 128 ROPs, and a 380.2 GPixel/s pixel rate. Its benchmark scores, including 26795 in Passmark G3D and 65879 in Geekbench Vulkan, demonstrate functional graphics performance. Its 16 GB GDDR6 memory and 644.6 GB/s bandwidth suit frame rendering and texture storage.

The verdict splits by use case. For compute-heavy workloads such as large-scale data processing, AI inference, or scientific simulation, the MI350X wins on raw throughput and memory scale. Its 48% FP32 advantage over the RX 9070 XT and its 12x bandwidth advantage make it the appropriate choice for these tasks, accepting its 1000 W TDP and module form factor.

For graphics rendering, gaming, or any workload requiring display output and API support, the RX 9070 XT is the functional option. The MI350X cannot output video or run graphics APIs at all. The RX 9070 XT's higher clock speeds, ray tracing cores, and complete display connectivity make it the only viable pick among these two for visual applications, with a launch MSRP of 599 USD.

The data does not support a single winner across all criteria. The MI350X dominates compute metrics, while the RX 9070 XT dominates graphics metrics. Their architectures, memory systems, power profiles, and feature sets align with entirely different deployment scenarios. The MI350X serves the data center, and the RX 9070 XT serves the desktop. Each wins in its designated domain, and neither substitutes for the other.