AMD Instinct MI455X vs AMD Radeon RX 7600 Comparison

Where Each One Wins

The two AMD accelerators occupy completely different performance domains, and the recorded data makes this split explicit. The Instinct MI455X is a compute-oriented accelerator with no rasterization pipelines, no display outputs, and zero benchmark entries in the database. Its average benchmark score is recorded as 0, placing it at the 50th percentile among all GPUs. The Radeon RX 7600, by contrast, is a fully featured consumer graphics card with ten recorded benchmark scores, an average score of 15,171, and a 57th percentile standing.

For any graphics workload, the RX 7600 wins outright. Its 3DMark Steel Nomad DX12 score of 2,310, PassMark G3D score of 16,634, and PassMark G2D score of 984 all demonstrate functional rendering capability. The MI455X has no display outputs, no DirectX support, no OpenGL support, and no Vulkan support, so it cannot produce frames for a monitor. The pixel rate for the MI455X is recorded as 0 MPixel/s, while the RX 7600 delivers 169.9 GPixel/s. The texture rate comparison is less lopsided in raw terms, 2,457.6 GTexel/s for the MI455X versus 339.8 GTexel/s for the RX 7600, but the MI455X has no pixel output stage to utilize that texture throughput.

For compute applications, the MI455X dominates in raw arithmetic capability. Its FP32 throughput is 157.3 TFLOPS, and its FP16 throughput is also 157.3 TFLOPS with 1:1 ratio. The RX 7600 delivers 21.75 TFLOPS in both FP32 and FP16 with the same 1:1 ratio. The MI455X has 32,768 shading units, 1,024 texture mapping units, and 432 GB of HBM4 memory with a 24,576-bit bus and 23.3 TB/s bandwidth. The RX 7600 has 2,048 shading units, 128 TMUs, 64 ROPs, and 8 GB of GDDR6 memory on a 128-bit bus with 288.0 GB/s bandwidth.

The MI455X also wins on memory capacity and bandwidth by such a margin that the RX 7600 cannot approach it. The 432 GB capacity is 54 times larger than the 8 GB on the RX 7600. The 23.3 TB/s bandwidth is roughly 81 times higher than the 288.0 GB/s figure. These differences point to workloads with massive datasets, such as training or inference, where the RX 7600 would exhaust its memory and bandwidth quickly.

The RX 7600 has ray tracing hardware with 32 RT cores, while the MI455X records no RT core count. The RX 7600 supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, all absent on the MI455X. In the database, the RX 7600 sits within 0.7 percent of several rivals: it trails the NVIDIA GeForce RTX 3050 OEM by 0.2 percent, leads the AMD Radeon Pro 560X by 0.6 percent, trails the AMD Radeon 680M by 0.7 percent, and leads the NVIDIA GeForce GTX 660 Ti by 0.7 percent. The MI455X has no recorded rivals because it has no benchmark scores to compare.

Architecture Differences

The two chips come from different AMD lineages. The Instinct MI455X uses the CDNA 5.0 architecture, built for data center compute. The chip is designated MI450 256CU and belongs to the Instinct (MIx) generation. The Radeon RX 7600 uses RDNA 3.0 architecture, belongs to the Radeon RX 7000 series, and carries the codename Hotpink Bonefish. Its generation is Navi III (RX 7000), and its chip is Navi 33.

The manufacturing process differs substantially. The MI455X is fabricated on a 2 nm node at TSMC, while the RX 7600 uses a 6 nm node, also at TSMC. Transistor counts reflect the scale gap: the MI455X packs 320,000 million transistors on a 2,990 mm² die, yielding a density of 107.0 million transistors per square millimeter. The RX 7600 has 13,300 million transistors on a 204 mm² die, with a density of 65.2 million per square millimeter. The MI455X die is roughly 14.7 times larger in area and holds about 24 times more transistors.

Memory architecture is another fundamental split. The MI455X uses HBM4 memory with a 24,576-bit bus, while the RX 7600 uses GDDR6 with a 128-bit bus. The MI455X memory clock is 1900 MHz with 7.6 Gbps effective data rate, whereas the RX 7600 memory clock is 2250 MHz with 18 Gbps effective. The MI455X has no ROPs, no display outputs, and no graphics API support. The RX 7600 has 64 ROPs, supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, and provides one HDMI 2.1a port plus three DisplayPort 2.1 outputs.

Power and cooling requirements diverge sharply. The MI455X has a TDP of 2300 W and a suggested PSU rating of 2700 W, while the RX 7600 has a TDP of 165 W and a suggested PSU of 450 W. The MI455X uses an EAM Module slot width and has no power connectors, meaning it receives power through the module interface. The RX 7600 is a dual-slot card with a single 8-pin power connector. The MI455X uses PCIe 6.0 x16, while the RX 7600 uses PCIe 4.0 x8.

Release timing also separates the two. The MI455X release date is recorded as 2026-07-22, while the RX 7600 launched on 2023-05-24. The RX 7600 has a predecessor in Navi II and a successor in Navi IV, and its production status is Active. The MI455X has a predecessor listed as Radeon Instinct, no successor, and no production status recorded.

FAQ

Q: Which card has more shading units?

A: The Instinct MI455X has 32,768 shading units, while the Radeon RX 7600 has 2,048 shading units.

Q: Does the Instinct MI455X support DirectX or Vulkan?

A: No. The MI455X records DirectX as N/A, OpenGL as N/A, and Vulkan as N/A. The RX 7600 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: What is the memory capacity difference?

A: The MI455X has 432 GB of HBM4 memory, while the RX 7600 has 8 GB of GDDR6 memory. The MI455X memory bus is 24,576 bits wide versus 128 bits for the RX 7600.

Q: Which card can output to a display?

A: Only the RX 7600 can. It provides 1x HDMI 2.1a and 3x DisplayPort 2.1 outputs. The MI455X has no display outputs.

Q: What is the average benchmark score for each?

A: The RX 7600 has an average benchmark score of 15,171 from ten tests. The MI455X has an average benchmark score of 0 because it has no recorded benchmarks.

Q: How does the RX 7600 compare to its nearest rivals?

A: The RX 7600 trails the NVIDIA GeForce RTX 3050 OEM by 0.2 percent, leads the AMD Radeon Pro 560X by 0.6 percent, trails the AMD Radeon 680M by 0.7 percent, and leads the NVIDIA GeForce GTX 660 Ti by 0.7 percent.

Specification Differences

The two cards differ in every major specification category. Process node: 2 nm for the MI455X versus 6 nm for the RX 7600. Transistor count: 320,000 million versus 13,300 million. Die size: 2,990 mm² versus 204 mm². Transistor density: 107.0M per mm² versus 65.2M per mm².

Clock speeds differ in direction. The MI455X base clock is 1000 MHz with a boost of 2400 MHz and no game clock. The RX 7600 base clock is 1720 MHz, boost is 2655 MHz, and game clock is 2250 MHz. Memory clocks: 1900 MHz with 7.6 Gbps effective for the MI455X, versus 2250 MHz with 18 Gbps effective for the RX 7600.

Memory specifications: 432 GB HBM4 versus 8 GB GDDR6. Bus width: 24,576 bits versus 128 bits. Bandwidth: 23.3 TB/s versus 288.0 GB/s. Shading units: 32,768 versus 2,048. TMUs: 1,024 versus 128. ROPs: 0 versus 64. RT cores: none recorded versus 32. Pixel rate: 0 MPixel/s versus 169.9 GPixel/s. Texture rate: 2,457.6 GTexel/s versus 339.8 GTexel/s. FP32: 157.3 TFLOPS versus 21.75 TFLOPS. FP16: 157.3 TFLOPS versus 21.75 TFLOPS.

Power: TDP 2300 W versus 165 W. Suggested PSU: 2700 W versus 450 W. Slot width: EAM Module versus dual-slot. Power connectors: none versus 1x 8-pin. Bus interface: PCIe 6.0 x16 versus PCIe 4.0 x8. Display outputs: none versus 1x HDMI 2.1a and 3x DisplayPort 2.1.

API support: none for the MI455X, versus DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 for the RX 7600. Release dates: 2026-07-22 versus 2023-05-24. The RX 7600 has a launch MSRP of 269 USD, while the MI455X has no recorded launch MSRP. The RX 7600 dimensions are 204 mm in length and 115 mm in height, while the MI455X has no recorded dimensions.

Head-to-Head Benchmarks

The head-to-head benchmark table in the database is empty, meaning no direct comparative tests exist between these two products. The MI455X has no benchmark entries at all, so no cross-product scores can be listed. The RX 7600 has ten recorded tests, and those scores define its performance profile.

The RX 7600 delivers its strongest result in PassMark G3D with a score of 16,634. Its Geekbench OpenCL score is 88,051, and its Geekbench Vulkan score is 34,401. The 3DMark Steel Nomad DX12 test yields 2,310. PassMark GPU Compute records 8,790. The PassMark DirectX tests show 84 for DirectX 10, 172 for DirectX 11, 58 for DirectX 12, and 226 for DirectX 9. The PassMark G2D score is 984. These scores place the RX 7600 at the 57th percentile among all GPUs, with an average score of 15,171.

The MI455X has no scores to compare directly. Its FP32 compute of 157.3 TFLOPS and FP16 of 157.3 TFLOPS indicate arithmetic capacity roughly 7.2 times higher than the RX 7600's 21.75 TFLOPS in both precisions. The texture rate of 2,457.6 GTexel/s is about 7.2 times the RX 7600's 339.8 GTexel/s. The memory bandwidth of 23.3 TB/s exceeds the RX 7600's 288.0 GB/s by a factor near 81. The MI455X transistor count of 320,000 million is about 24 times the RX 7600's 13,300 million.

The RX 7600 has a percentile rank of 57, which means it outperforms more than half of all GPUs in the database. The MI455X sits at the 50th percentile, but that rank reflects zero recorded scores rather than a measured performance level. The nearest rivals for the RX 7600 show a tight cluster: the NVIDIA GeForce RTX 3050 OEM averages 15,199, the AMD Radeon Pro 560X averages 15,082, the AMD Radeon 680M averages 15,270, and the NVIDIA GeForce GTX 660 Ti averages 15,063. The RX 7600 average of 15,171 sits within 0.7 percent of all four rivals, indicating a competitive mid-range position.

The MI455X cannot enter that comparison because it has no benchmark scores. Its role is defined by specifications, not measured results. The RX 7600 is a complete graphics solution with rendering, ray tracing, display output, and compute capability. The MI455X is a specialized compute accelerator with massive memory, extreme bandwidth, and no graphics pipeline. The data shows two products designed for different tasks, and the absence of shared benchmarks means no single score can rank them against each other.