AMD Instinct MI455X vs AMD Radeon RX 9070 Comparison

FAQ

Q: What is the performance percentile ranking of the AMD Radeon RX 9070?

A: The Radeon RX 9070 sits at the 69th percentile among all GPUs in the database, with an average benchmark score of 23,877.

Q: What is the performance percentile ranking of the AMD Instinct MI455X?

A: The Instinct MI455X is at the 50th percentile, with an average benchmark score of 0, meaning no direct benchmark entries are recorded for this accelerator.

Q: How does the Radeon RX 9070 compare to its nearest rival, the NVIDIA GeForce RTX 2080 SUPER?

A: The RX 9070 averages 23,877 versus the RTX 2080 SUPER's 24,170, a delta of -1.2%, meaning the RX 9070 trails that rival by just over one percent.

Q: What is the closest rival to the RX 9070 based on benchmark scores?

A: The AMD Radeon RX 6800S is the closest, with an average score of 24,063 versus the RX 9070's 23,877, a delta of -0.8%.

Q: What is the memory configuration difference between the two cards?

A: The Instinct MI455X uses 432 GB of HBM4 memory on a 24,576-bit bus with 23.3 TB/s bandwidth, while the RX 9070 uses 16 GB of GDDR6 on a 256-bit bus with 644.6 GB/s bandwidth.

Q: What is the launch MSRP of the Radeon RX 9070?

A: The RX 9070 has a launch MSRP of 549 USD. The Instinct MI455X has no recorded launch MSRP.

The Verdict

The data presents two fundamentally different AMD products with no overlapping benchmark entries. The Radeon RX 9070 is a production-active consumer graphics card with a 69th percentile ranking and a full suite of recorded benchmark scores. The Instinct MI455X is a datacenter accelerator with a 50th percentile ranking and zero recorded benchmarks, reflecting its specialized role rather than a performance deficit.

For graphics workloads, the RX 9070 is the only option with measurable results. Its average score of 23,877 places it slightly behind the RX 6800S (24,063) and RTX 2080 SUPER (24,170) but slightly ahead of the GTX TITAN Z (23,736) and RTX 3080 Mobile (23,628). The card delivers direct competition within a narrow band of roughly 1.2% across these four rivals.

The Instinct MI455X targets compute environments where raw throughput matters more than graphical output. Its FP32 and FP16 performance of 157.3 TFLOPS each, combined with 432 GB of HBM4 memory, positions it for large-scale parallel workloads. The absence of display outputs, graphics API support, and a 2,300 W TDP confirm this is not a consumer graphics product.

The RX 9070 suits gamers and workstation users needing standard display outputs, DirectX 12 Ultimate support, and a dual-slot form factor. The MI455X suits datacenter deployments requiring massive memory capacity and compute density, despite the lack of benchmark scores in the database. The 50th percentile for the MI455X reflects the absence of recorded data, not measured performance.

Head-to-Head Benchmarks

The database contains no head-to-head benchmark entries between these two products. The MI455X has an empty benchmarks array, and the headToHeadBenchmarks field is empty. Direct comparisons of measured performance are therefore impossible from the recorded data.

The RX 9070 provides the only available benchmark results. Its 3DMark Steel Nomad DX12 score is 6,290. Geekbench results show 131,539 for OpenCL and 58,705 for Vulkan. Passmark scores include 25,381 for G3D, 14,737 for GPU Compute, 1,280 for G2D, and legacy DirectX results of 343 (DX9), 281 (DX11), 141 (DX10), and 74 (DX12). These figures establish a baseline for consumer graphics performance.

The MI455X, by contrast, lists theoretical peak rates: 157.3 TFLOPS FP32 and FP16, a texture rate of 2,457.6 GTexel/s, and a pixel rate of 0 MPixel/s, since it has no ROPs. The RX 9070 delivers 36.13 TFLOPS FP32 and FP16, a texture rate of 564.5 GTexel/s, and a pixel rate of 322.6 GPixel/s. The MI455X's FP32 throughput is 4.35 times higher than the RX 9070's, and its texture rate is 4.35 times higher as well, but these are architectural specifications, not measured benchmark outcomes.

The RX 9070's nearest rival comparisons show a tightly clustered competitive set. The GTX TITAN Z scores 23,736, which is 0.6% below the RX 9070. The RTX 3080 Mobile scores 23,628, which is 1.1% below. The RX 6800S scores 24,063, which is 0.8% above. The RTX 2080 SUPER scores 24,170, which is 1.2% above. The RX 9070's average score of 23,877 lands near the middle of this group, with the largest measured gap being 1.2% in either direction.

Specification Differences

The two cards differ in nearly every measurable specification. The MI455X uses a 2 nm process node, while the RX 9070 uses 4 nm. Both come from TSMC. Transistor counts differ substantially: the MI455X packs 320,000 million transistors on a 2,990 mm² die, while the RX 9070 has 53,900 million on 357 mm². Transistor density favors the RX 9070 at 151.0M per mm² versus 107.0M per mm² for the MI455X.

Clock speeds show different strategies. The MI455X has a base clock of 1,000 MHz and a boost of 2,400 MHz. The RX 9070 has a base of 1,330 MHz, a game clock of 2,070 MHz, and a boost of 2,520 MHz. Memory clocks also differ: the MI455X runs at 1,900 MHz with 7.6 Gbps effective, while the RX 9070 runs at 2,518 MHz with 20.1 Gbps effective.

The MI455X has 32,768 shading units and 1,024 TMUs, but zero ROPs. The RX 9070 has 3,584 shading units, 224 TMUs, and 128 ROPs. The MI455X lists no ray tracing cores, while the RX 9070 includes 56. Neither card lists tensor cores.

Power requirements are extreme on the MI455X side: a 2,300 W TDP with a suggested PSU of 2,700 W. The RX 9070 requires 220 W with a 550 W suggested PSU. The MI455X uses an EAM Module slot width and no power connectors, while the RX 9070 is dual-slot with two 8-pin connectors.

Bus interfaces differ by generation: the MI455X uses PCIe 6.0 x16, the RX 9070 uses PCIe 5.0 x16. Display outputs exist only on the RX 9070, which offers 1x HDMI 2.1b and 3x DisplayPort 2.1a; the MI455X has no outputs.

Release dates are separated by over a year. The RX 9070 launched on 2025-03-05, while the MI455X is dated 2026-07-22. The RX 9070 has an active production status; the MI455X does not list one. The RX 9070's launch MSRP is 549 USD; the MI455X has none recorded.

Architecture Differences

The MI455X uses CDNA 5.0 architecture on the MI450 256CU chip, while the RX 9070 uses RDNA 4.0 on the Navi 48 chip. These are separate architectural lineages: CDNA targets compute acceleration, RDNA targets graphics rendering. The MI455X belongs to the Instinct (MIx) generation, while the RX 9070 belongs to the Navi IV (RX 9000) generation.

Memory architecture diverges completely. The MI455X uses HBM4 with 432 GB capacity, a 24,576-bit bus, and 23.3 TB/s bandwidth. The RX 9070 uses GDDR6 with 16 GB capacity, a 256-bit bus, and 644.6 GB/s bandwidth. The MI455X's memory bandwidth is 36.1 times higher, reflecting its datacenter orientation where memory throughput is critical for large models and datasets.

The MI455X has no graphics API support: DirectX, OpenGL, and Vulkan are all listed as N/A. The RX 9070 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. This confirms the MI455X is not designed for traditional graphics rendering, despite having 32,768 shading units.

Pixel rate is zero on the MI455X due to the absence of ROPs, while the RX 9070 achieves 322.6 GPixel/s. Texture rates are 2,457.6 GTexel/s versus 564.5 GTexel/s, a 4.35x advantage for the MI455X. FP32 and FP16 performance are both 157.3 TFLOPS on the MI455X and 36.13 TFLOPS on the RX 9070, with both maintaining a 1:1 FP16 to FP32 ratio.

The MI455X's predecessor is listed as Radeon Instinct, while the RX 9070's predecessor is Navi III. Neither has a recorded successor. The MI455X uses a 2 nm node with a 2,990 mm² die, an enormous physical footprint for a compute accelerator. The RX 9070's 357 mm² die on 4 nm is typical for a consumer graphics card.

The RX 9070's 56 ray tracing cores indicate hardware support for ray-traced rendering, a feature absent from the MI455X's specification list. The MI455X compensates with raw compute density: 107.0M transistors per mm² versus the RX 9070's 151.0M per mm², though the MI455X's absolute transistor count is nearly six times higher.