AMD Instinct MI355X vs AMD Radeon RX 7700 Comparison

Head-to-Head Benchmarks

The database contains benchmark records for only one of these two accelerators. The AMD Instinct MI355X has no recorded benchmark scores, while the AMD Radeon RX 7700 has nine separate test results. This asymmetry means the comparison is based on the RX 7700's measured performance and the MI355X's architectural specifications, rather than direct head-to-head test data.

The RX 7700's strongest recorded result comes from the PassMark G3D test, where it scores 20,974 points. Its average benchmark score across all nine tests is 15,852 points, placing it in the 58th percentile of all GPUs in the database. The nearest rival to the RX 7700 is the AMD Radeon R9 370X, which scores 15,862 points, a negligible 0.1% difference. The AMD Radeon Pro W5500 trails by 1.1% with 15,679 points, while the NVIDIA GeForce RTX 3060 Ti leads the RX 7700 by 1.7% with 16,129 points. The AMD Radeon RX 9060 sits just ahead at 16,014 points, a 1% margin.

In compute workloads, the RX 7700 delivers 10,963 points on the PassMark GPU Compute test. The GeekBench OpenCL benchmark records 106,028 points, indicating strong general-purpose compute throughput. DirectX 12 performance in 3DMark Steel Nomad shows 2,865 points.

The MI355X, by contrast, has zero recorded benchmarks and sits at the 50th percentile in the database. Its average score is zero. This is not a performance deficiency; it simply reflects that no test data has been entered for this accelerator. The hardware specifications, however, suggest a dramatically different performance class. The MI355X carries 16,384 shading units, 1,024 texture mapping units, and no ROPs, which aligns with its compute-focused design. The RX 7700 has 2,560 shading units, 160 TMUs, and 96 ROPs, a configuration suited for rasterized graphics rendering.

The FP32 throughput numbers illustrate the scale difference. The MI355X reaches 78.64 TFLOPS, while the RX 7700 delivers 25.18 TFLOPS. Both run FP16 at a 1:1 ratio, meaning the MI355X also achieves 78.64 TFLOPS in half precision, and the RX 7700 matches its FP32 figure at 25.18 TFLOPS. Texture fill rates tell a similar story: 2,457.6 GTexel/s for the MI355X versus 393.4 GTexel/s for the RX 7700. The RX 7700 produces 236.1 GPixel/s, while the MI355X is recorded at 0 MPixel/s, consistent with its lack of display outputs and ROPs.

Where Each One Wins

The RX 7700 wins decisively in every recorded benchmark category, but that is solely because it has benchmark data and the MI355X does not. The meaningful comparison comes from the architectural roles each device serves.

For rasterized graphics, the RX 7700 is the clear choice. It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Its 96 ROPs and 40 ray tracing cores enable real-time rendering workloads. The MI355X has no API support listed for DirectX, OpenGL, or Vulkan, and it lacks display outputs entirely. The RX 7700 also provides a full display interface suite: 1x HDMI 2.1a, 2x DisplayPort 2.1, and 1x USB Type-C. The MI355X has no display outputs.

For compute and machine learning workloads, the MI355X dominates by specification. Its 288 GB of HBM3e memory with an 8,192-bit bus width delivers 8.19 TB/s of bandwidth. The RX 7700 uses 16 GB of GDDR6 on a 256-bit bus, achieving 624.1 GB/s. The MI355X memory bandwidth is roughly 13 times higher in the recorded figures. The 185,000 million transistors on the MI355X dwarf the RX 7700's 28,100 million, and the die size difference is substantial: 2,380 mm² versus 346 mm².

The RX 7700's transistor density is actually higher at 81.2 million transistors per square millimeter, compared to 77.7 million for the MI355X. This reflects the different process nodes: the MI355X uses a 3 nm node, while the RX 7700 uses 5 nm. Both are fabricated by TSMC.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI355X reaches 78.64 TFLOPS in FP32, while the AMD Radeon RX 7700 delivers 25.18 TFLOPS. The MI355X offers roughly three times the FP32 throughput.

Q: What is the memory capacity difference?

A: The MI355X has 288 GB of HBM3e memory, while the RX 7700 has 16 GB of GDDR6. Memory bandwidth also differs significantly: 8.19 TB/s versus 624.1 GB/s.

Q: Does the MI355X support DirectX or display outputs?

A: No. The MI355X lists N/A for DirectX, OpenGL, and Vulkan APIs, and has no display outputs. The RX 7700 supports DirectX 12 Ultimate, OpenGL 4.6, Vulkan 1.4, and provides HDMI, DisplayPort, and USB Type-C outputs.

Q: Which GPU has a higher recorded benchmark score?

A: The RX 7700 has all the recorded benchmark scores, with an average of 15,852 points and a 58th percentile ranking. The MI355X has no benchmark entries and sits at the 50th percentile with an average score of zero.

Q: What are the power requirements?

A: The MI355X has a TDP of 1400 W and requires an 1800 W power supply. The RX 7700 has a TDP of 200 W with a 550 W suggested power supply.

Q: How do the nearest rivals compare to the RX 7700?

A: The AMD Radeon R9 370X is essentially tied at 15,862 points (-0.1%). The AMD Radeon RX 9060 scores 16,014 points (+1%), the AMD Radeon Pro W5500 scores 15,679 points (-1.1%), and the NVIDIA GeForce RTX 3060 Ti scores 16,129 points (+1.7%).

Specification Differences

The process node differs: the MI355X uses 3 nm, the RX 7700 uses 5 nm, both from TSMC. Transistor counts are 185,000 million for the MI355X versus 28,100 million for the RX 7700. Die sizes are 2,380 mm² and 346 mm² respectively. Transistor density favors the RX 7700 at 81.2 million per mm² versus 77.7 million per mm².

Memory configurations are entirely different. The MI355X uses 288 GB HBM3e on an 8,192-bit bus with 8.19 TB/s bandwidth. The RX 7700 uses 16 GB GDDR6 on a 256-bit bus with 624.1 GB/s bandwidth. Memory clocks are 2000 MHz (8 Gbps effective) for the MI355X and 2438 MHz (19.5 Gbps effective) for the RX 7700.

Core counts show the MI355X with 16,384 shading units, 1,024 TMUs, and 0 ROPs. The RX 7700 has 2,560 shading units, 160 TMUs, and 96 ROPs. The RX 7700 includes 40 ray tracing cores; the MI355X lists none. Clock speeds are 1000 MHz base and 2400 MHz boost for the MI355X, while the RX 7700 runs at 1900 MHz base, 2041 MHz game, and 2459 MHz boost.

Power and physical specifications diverge sharply. The MI355X has a 1400 W TDP, an OAM Module slot width, no power connectors, and an 1800 W suggested PSU. The RX 7700 has a 200 W TDP, dual-slot width, 2x 8-pin connectors, and a 550 W suggested PSU. The MI355X measures 102 mm by 165 mm, while the RX 7700 measures 267 mm by 135 mm by 50 mm. Bus interfaces are PCIe 5.0 x16 for the MI355X and PCIe 4.0 x16 for the RX 7700.

Release dates differ: the MI355X launched on June 11, 2025, and the RX 7700 on September 17, 2025. The RX 7700 is marked as Active in production, with a predecessor of Navi II and successor of Navi IV. The MI355X lists Radeon Instinct as its predecessor.

Architecture Differences

The MI355X uses the CDNA 4.0 architecture on the MI350 256CU chip. The RX 7700 uses RDNA 3.0 on the Navi 32 chip, with the codename Wheat Nas. These are fundamentally different design philosophies. CDNA 4.0 is optimized for data center compute, while RDNA 3.0 targets consumer graphics. The MI355X belongs to the Instinct (MIx) generation, while the RX 7700 sits in the Navi III (RX 7000) generation.

The MI355X has no ROPs, no display outputs, and no graphics API support, confirming its compute-only role. Its 1,024 TMUs and 16,384 shading units feed massive parallel compute workloads. The RX 7700's 96 ROPs and 40 ray tracing cores enable graphics rendering with API compatibility for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Memory architecture differs by design intent. HBM3e on the MI355X provides extreme bandwidth for memory-bound compute kernels. GDDR6 on the RX 7700 balances capacity and cost for gaming workloads. The MI355X's 288 GB capacity targets large model inference and training, while the RX 7700's 16 GB serves typical game textures and scene data.

The Verdict

The data shows two purpose-built accelerators with minimal overlap. The AMD Instinct MI355X is designed for compute workloads that demand massive memory capacity and bandwidth. Its 288 GB HBM3e, 8.19 TB/s bandwidth, and 78.64 TFLOPS FP32 performance place it in a category for data center inference and training tasks. The absence of display outputs, graphics APIs, and ROPs confirms this specialization.

The AMD Radeon RX 7700 is a consumer graphics card with recorded performance data. Its average benchmark score of 15,852 points and 58th percentile ranking place it near the AMD Radeon R9 370X, AMD Radeon RX 9060, AMD Radeon Pro W5500, and NVIDIA GeForce RTX 3060 Ti. It delivers 25.18 TFLOPS FP32 and supports modern graphics APIs with display connectivity.

For anyone needing a graphics output device, a gaming accelerator, or a workstation card with API support, the RX 7700 is the only viable option between these two. For compute tasks that fit within the MI355X's capabilities, such as large memory footprint workloads or bandwidth-intensive operations, the MI355X provides specifications that the RX 7700 cannot approach. The 50th percentile ranking for the MI355X reflects missing benchmark data, not measured performance, so the specification comparison must carry the analysis. The RX 7700's measured results show a solid mid-range performer, while the MI355X's unmeasured potential remains defined by its architectural parameters alone.