AMD Instinct MI455X vs AMD Radeon RX 9070 GRE Comparison

Head-to-Head Benchmarks

The AMD Instinct MI455X and the AMD Radeon RX 9070 GRE occupy entirely different corners of the hardware landscape, despite sharing the same manufacturer. The database contains no direct head-to-head benchmark runs between these two accelerators, but the recorded specifications and the RX 9070 GRE's measured scores allow for a clear comparison of their respective capabilities.

The RX 9070 GRE delivers a 3DMark Steel Nomad DX12 score of 5,424 points and a Geekbench OpenCL score of 109,309 points. Its average benchmark score across all recorded tests sits at 57,367 points, placing it in the 87th percentile of all GPUs in the database. The MI455X, by contrast, has no recorded benchmark scores, an average benchmark score of zero, and sits in the 50th percentile. That percentile figure is a neutral midpoint, reflecting the absence of measured data rather than any indication of performance.

The raw compute figures tell a story of extreme divergence. The MI455X delivers 157.3 TFLOPS of FP32 throughput, while the RX 9070 GRE delivers 34.28 TFLOPS. That puts the MI455X at roughly 4.6 times the FP32 compute of the RX 9070 GRE. The FP16 figures mirror this exactly: 157.3 TFLOPS for the MI455X versus 34.28 TFLOPS for the RX 9070 GRE, with both running a 1:1 ratio.

Memory is where the gap becomes almost absurd. The MI455X carries 432 GB of HBM4 memory across a 24,576-bit bus, delivering 23.3 TB/s of bandwidth. The RX 9070 GRE carries 12 GB of GDDR6 across a 192-bit bus, delivering 432.0 GB/s. That means the MI455X has 36 times the memory capacity and roughly 54 times the memory bandwidth. The memory clock figures also diverge sharply: the MI455X runs its memory at 1900 MHz with 7.6 Gbps effective throughput, while the RX 9070 GRE runs at 2250 MHz with 18 Gbps effective.

Texture and pixel throughput show a similar asymmetry. The MI455X posts a texture rate of 2,457.6 GTexel/s, compared to 535.7 GTexel/s for the RX 9070 GRE. The pixel rate, however, is where the MI455X shows a notable anomaly: it records 0 MPixel/s, while the RX 9070 GRE delivers 267.8 GPixel/s. The MI455X also has zero ROPs, while the RX 9070 GRE has 96. This indicates that the MI455X is not designed for traditional rasterized graphics output at all, which aligns with its complete lack of display outputs.

Clock speeds present a different kind of contrast. The RX 9070 GRE runs a base clock of 1420 MHz and a boost clock of 2790 MHz, with a game clock of 2220 MHz. The MI455X runs a base clock of 1000 MHz and a boost clock of 2400 MHz. Despite the lower clocks, the MI455X achieves far higher throughput because of its massive scale: 32,768 shading units versus 3,072, and 1,024 TMUs versus 192. The MI455X also carries 48 ray tracing cores on the RX 9070 GRE, while the MI455X lists no RT core count at all.

The nearest rival data in the database applies only to the RX 9070 GRE. Its average score of 57,367 puts it within a hair of the Intel Arc A580, which scores 57,756, a delta of 0.7 percent in the Arc's favor. The AMD Radeon RX 5600 OEM scores 58,085, 1.2 percent ahead. The Intel Arc A570M scores 58,239, 1.5 percent ahead. The AMD Radeon RX 6950 XT scores 58,392, 1.8 percent ahead. These are all extremely tight margins, indicating that the RX 9070 GRE sits in a densely packed performance cluster where a single percentage point separates several products.

The Verdict

The data presents two products with fundamentally different purposes. The AMD Instinct MI455X is a compute accelerator with no display outputs, no graphics API support, and a power envelope that requires a 2,700 W suggested PSU. The AMD Radeon RX 9070 GRE is a conventional graphics card with display outputs, full DirectX 12 Ultimate support, OpenGL 4.6, and Vulkan 1.4, running on a 550 W suggested PSU.

The RX 9070 GRE is the only one of the two with any recorded benchmark data. Its 87th percentile ranking among all GPUs in the database, combined with an average score of 57,367, places it in solid mainstream territory. The nearest rival data confirms this: it trades blows with the Intel Arc A580, AMD Radeon RX 5600 OEM, Intel Arc A570M, and AMD Radeon RX 6950 XT, all within 1.8 percent of each other. The RX 9070 GRE is the slower of the four by a narrow margin in every case, but the differences are small enough that real-world application selection would likely matter more than the raw aggregate score.

The MI455X cannot be evaluated through the same lens. With no benchmarks, no display outputs, and no graphics API support, it is not a competing product for the RX 9070 GRE in any gaming or consumer graphics sense. Its 157.3 TFLOPS FP32 compute, 432 GB of HBM4 memory, and 23.3 TB/s bandwidth position it as a data center or scientific computing part. The 2,300 W TDP and EAM Module slot width reinforce this: this is not a card that goes inside a desktop tower.

The production status also differs. The RX 9070 GRE is listed as Active, while the MI455X has a null production status, meaning the database does not confirm whether it is currently in production. The release dates are 2025-05-07 for the RX 9070 GRE and 2026-07-22 for the MI455X, making the MI455X a later product by more than a year.

Where Each One Wins

The RX 9070 GRE wins in every category that matters for a desktop graphics card. It has display outputs in the form of 1x HDMI 2.1b and 3x DisplayPort 2.1a. It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. It has 96 ROPs and a pixel rate of 267.8 GPixel/s, which means it can drive rasterized frames to a screen. It has 48 ray tracing cores. It fits in a dual-slot form factor and uses standard 2x 8-pin power connectors. Its suggested PSU is 550 W, which is within the range of a typical high-end desktop power supply. Its 12 GB of GDDR6 memory is conventional and sufficient for consumer workloads.

The MI455X wins in raw compute and memory capacity. Its 157.3 TFLOPS FP32 and FP16 throughput dwarfs the RX 9070 GRE. Its 432 GB of HBM4 memory with 23.3 TB/s bandwidth is in a different class entirely. Its transistor count of 320,000 million on a 2 nm TSMC process compares to 53,900 million on a 4 nm process for the RX 9070 GRE. Its die size of 2990 mm² is more than eight times the RX 9070 GRE's 357 mm². The MI455X has 32,768 shading units, more than ten times the RX 9070 GRE's 3,072. Its 1,024 TMUs are more than five times the RX 9070 GRE's 192.

The MI455X also uses a newer process node: 2 nm versus 4 nm, both from TSMC. The transistor density tells a nuanced story: the MI455X has 107.0 million transistors per mm², while the RX 9070 GRE has 151.0 million per mm². The smaller die with denser packing on the RX 9070 GRE means the MI455X's enormous die is actually less densely packed, likely because of the HBM4 memory stacks and the scale of the compute array.

The bus interface also differs: the MI455X uses PCIe 6.0 x16, while the RX 9070 GRE uses PCIe 5.0 x16. The MI455X's interface is a generation newer, which aligns with its later release date.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS FP32, compared to 34.28 TFLOPS for the AMD Radeon RX 9070 GRE.

Q: How much memory does each card have?

A: The MI455X has 432 GB of HBM4 memory on a 24,576-bit bus, while the RX 9070 GRE has 12 GB of GDDR6 memory on a 192-bit bus.

Q: What is the average benchmark score for the RX 9070 GRE?

A: The RX 9070 GRE has an average benchmark score of 57,367 points, which places it in the 87th percentile of all GPUs in the database.

Q: Does the MI455X have any display outputs?

A: No. The MI455X lists no display outputs, while the RX 9070 GRE has 1x HDMI 2.1b and 3x DisplayPort 2.1a.

Q: What is the suggested PSU requirement for each card?

A: The MI455X requires a 2,700 W suggested PSU and has a TDP of 2,300 W. The RX 9070 GRE requires a 550 W suggested PSU and has a TDP of 220 W.

Q: How does the RX 9070 GRE compare to its nearest rivals?

A: The RX 9070 GRE trails the Intel Arc A580 by 0.7 percent, the AMD Radeon RX 5600 OEM by 1.2 percent, the Intel Arc A570M by 1.5 percent, and the AMD Radeon RX 6950 XT by 1.8 percent in average benchmark score.

Architecture Differences

The two GPUs are built on completely different architectures from AMD. The MI455X uses CDNA 5.0, designed for compute and data center workloads. The RX 9070 GRE uses RDNA 4.0, designed for graphics rendering and consumer gaming. The MI455X's chip is designated MI450 256CU, while the RX 9070 GRE uses Navi 48.

The manufacturing process differs significantly. The MI455X is fabricated on a 2 nm process at TSMC, while the RX 9070 GRE uses a 4 nm process at the same foundry. The transistor counts are 320,000 million for the MI455X and 53,900 million for the RX 9070 GRE. The die sizes are 2990 mm² and 357 mm² respectively. The transistor density is higher on the RX 9070 GRE at 151.0 million per mm², compared to 107.0 million per mm² for the MI455X.

The compute resources are starkly different. The MI455X has 32,768 shading units, 1,024 TMUs, and 0 ROPs. The RX 9070 GRE has 3,072 shading units, 192 TMUs, and 96 ROPs. The MI455X lists no ray tracing core count, while the RX 9070 GRE has 48. Neither card lists tensor cores.

Memory architecture is entirely different. The MI455X uses HBM4 with a 24,576-bit bus, delivering 23.3 TB/s bandwidth. The RX 9070 GRE uses GDDR6 with a 192-bit bus, delivering 432.0 GB/s. The memory clocks are 1900 MHz (7.6 Gbps effective) for the MI455X and 2250 MHz (18 Gbps effective) for the RX 9070 GRE.

Power and form factor differences are extreme. The MI455X has a TDP of 2,300 W, uses an EAM Module slot width, and has no power connectors listed, relying on the module socket for power delivery. The RX 9070 GRE has a TDP of 220 W, uses a dual-slot form factor, and draws power through 2x 8-pin connectors. The suggested PSU ratings are 2,700 W for the MI455X and 550 W for the RX 9070 GRE.

API support is another major divider. The MI455X lists N/A for DirectX, OpenGL, and Vulkan. The RX 9070 GRE supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The bus interfaces are PCIe 6.0 x16 for the MI455X and PCIe 5.0 x16 for the RX 9070 GRE.

The release dates place them in different product generations: the RX 9070 GRE launched on 2025-05-07, and the MI455X on 2026-07-22. The RX 9070 GRE is part of the Radeon RX 9000 series, while the MI455X belongs to the Instinct (MIx) generation. The RX 9070 GRE's predecessor is listed as Navi III, and the MI455X's predecessor is Radeon Instinct. The RX 9070 GRE has a launch MSRP of 549 USD, while the MI455X has no listed launch MSRP.