AMD Instinct MI355X vs AMD Radeon RX 7700S Comparison

The Verdict

The database presents an unusual comparison: the AMD Instinct MI355X and the AMD Radeon RX 7700S occupy entirely different segments, and the recorded data reflects that split. The MI355X is a compute accelerator with no benchmark scores, no display outputs, and a 50th percentile ranking among all GPUs. The RX 7700S is a mobile graphics processor with three recorded benchmark scores and a 78th percentile ranking. The data shows no head-to-head benchmark results, so the verdict rests on architectural roles and measured performance where available.

The RX 7700S is the only one of the two with any benchmark data. Its average benchmark score is 33,849, placing it 0.3% behind the AMD Radeon HD 7950, 0.4% behind the AMD Radeon RX 480, 0.5% ahead of the NVIDIA GeForce GTX 1060 5 GB, and 0.7% ahead of the NVIDIA RTX A5000. The MI355X has no recorded benchmarks and an average score of zero, which explains its 50th percentile ranking. For any workload requiring a display output or standard graphics APIs, the RX 7700S is the functional choice; the MI355X offers none of those.

The MI355X, however, delivers specifications that dwarf the RX 7700S in raw compute capacity. Its FP32 throughput is 78.64 TFLOPS versus 20.48 TFLOPS, its memory bandwidth is 8.19 TB/s versus 288.0 GB/s, and its memory capacity is 288 GB versus 8 GB. The data indicates the MI355X is designed for server-side acceleration, while the RX 7700S targets portable devices. Users needing graphics output, DirectX, OpenGL, or Vulkan support must select the RX 7700S; users needing massive memory and compute density must select the MI355X.

Where Each One Wins

The RX 7700S wins in every measured benchmark category because it is the only chip with recorded results. In 3DMark Steel Nomad DX12, it scores 2,185. In Geekbench OpenCL, it scores 62,983. In Geekbench Vulkan, it scores 36,380. These results confirm its capability in standard graphics and compute workloads on mobile platforms. The MI355X has zero benchmark entries, so it cannot claim a single recorded win.

The MI355X wins on architectural scale. It uses 16,384 shading units, 1,024 TMUs, and 8192-bit memory bus width. The RX 7700S uses 2,048 shading units, 128 TMUs, and a 128-bit bus. The MI355X has a texture rate of 2,457.6 GTexel/s versus 320.0 GTexel/s for the RX 7700S. The MI355X also has a pixel rate of 0 MPixel/s, which indicates it lacks rasterization output, while the RX 7700S delivers 160.0 GPixel/s. The MI355X wins on pure compute density; the RX 7700S wins on being a complete graphics solution.

The process node also favors the MI355X. It uses a 3 nm process from TSMC, while the RX 7700S uses a 6 nm process from the same foundry. The MI355X packs 185,000 million transistors on a 2380 mm² die, achieving a density of 77.7M transistors per mm². The RX 7700S has 13,300 million transistors on a 204 mm² die, with a density of 65.2M per mm². The MI355X's newer node and larger die enable its extreme specifications, but the RX 7700S remains the only option with active production status and display outputs.

Architecture Differences

The two chips use fundamentally different architectures. The MI355X is built on CDNA 4.0, a compute-focused design in the Instinct generation. The RX 7700S uses RDNA 3.0, a graphics-focused architecture in the Navi Mobile generation. The MI355X uses a chip designated "MI350 256CU," while the RX 7700S uses "Navi 33" with the codename "Hotpink Bonefish." These are not minor tweaks; they represent separate design philosophies.

The memory subsystems diverge sharply. The MI355X uses 288 GB of HBM3e with a 8192-bit bus and 8.19 TB/s bandwidth. The RX 7700S uses 8 GB of GDDR6 with a 128-bit bus and 288.0 GB/s bandwidth. The MI355X's memory clock is 2000 MHz (8 Gbps effective), while the RX 7700S runs at 2250 MHz (18 Gbps effective). The MI355X's bandwidth is roughly 28 times higher, a direct consequence of its 64 times wider bus.

Compute feature sets also differ. The MI355X reports FP16 at 78.64 TFLOPS with a 1:1 ratio to FP32, meaning it does not double-rate half-precision. The RX 7700S reports FP16 at 40.96 TFLOPS with a 2:1 ratio, meaning it doubles throughput for half-precision relative to its 20.48 TFLOPS FP32. The RX 7700S includes 32 ray tracing cores, while the MI355X lists no RT cores. The MI355X has no API support for DirectX, OpenGL, or Vulkan; the RX 7700S supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Power and physical design differ as well. The MI355X has a TDP of 1400 W, a suggested PSU of 1800 W, and uses an OAM module slot width. The RX 7700S has a TDP of 100 W and an IGP slot width. The MI355X measures 102 mm in length and 165 mm in width; the RX 7700S has no recorded dimensions. The MI355X has no power connectors listed and no display outputs; the RX 7700S has display outputs described as "Portable Device Dependent."

FAQ

Q: Which GPU has better benchmark scores?

A: The RX 7700S is the only one with recorded benchmarks. It scores 2,185 in 3DMark Steel Nomad DX12, 62,983 in Geekbench OpenCL, and 36,380 in Geekbench Vulkan. The MI355X has no benchmark entries.

Q: Which GPU has more memory?

A: The MI355X has 288 GB of HBM3e memory, while the RX 7700S has 8 GB of GDDR6. The MI355X also has a much wider bus at 8192 bits versus 128 bits.

Q: Can the MI355X output video to a display?

A: No. The MI355X lists "No outputs" for display outputs and has no API support for DirectX, OpenGL, or Vulkan. The RX 7700S has portable-device-dependent display outputs and full API support.

Q: What is the power consumption difference?

A: The MI355X has a TDP of 1400 W and a suggested PSU of 1800 W. The RX 7700S has a TDP of 100 W and no suggested PSU listed.

Q: Which GPU uses a newer manufacturing process?

A: The MI355X uses a 3 nm process from TSMC. The RX 7700S uses a 6 nm process from the same foundry. The MI355X also has a higher transistor density at 77.7M per mm² versus 65.2M per mm².

Q: How does the RX 7700S compare to its nearest rivals?

A: Its average benchmark score of 33,849 is 0.3% behind the AMD Radeon HD 7950, 0.4% behind the AMD Radeon RX 480, 0.5% ahead of the NVIDIA GeForce GTX 1060 5 GB, and 0.7% ahead of the NVIDIA RTX A5000.

Head-to-Head Benchmarks

There are no head-to-head benchmark results in the database for these two products. The wins count is zero for both items. The MI355X has an empty benchmarks array, and the headToHeadBenchmarks array is also empty. The RX 7700S has three standalone benchmarks, but none are paired against the MI355X.

The lack of direct comparisons is itself informative. The RX 7700S's 3DMark Steel Nomad DX12 score of 2,185 is a graphics workload that the MI355X cannot run due to its lack of DirectX support. The Geekbench OpenCL score of 62,983 measures general compute, which the MI355X would likely handle differently given its FP32 throughput of 78.64 TFLOPS versus 20.48 TFLOPS for the RX 7700S. The Geekbench Vulkan score of 36,380 similarly requires Vulkan support, which the MI355X does not list.

The nearest rival data for the RX 7700S provides context. Its average score of 33,849 lands between the NVIDIA RTX A5000 at 33,622 (0.7% lower) and the AMD Radeon RX 480 at 33,997 (0.4% higher). The spread across all four rivals is less than 1.1 percentage points, indicating the RX 7700S sits in a tightly competitive band for its segment. The MI355X has no nearest rivals listed, which suggests the database has no comparable accelerators to reference.

Specification Differences

The two products differ in nearly every recorded field. The MI355X uses the MI350 256CU chip with CDNA 4.0 architecture; the RX 7700S uses Navi 33 with RDNA 3.0. The MI355X has no codename listed, while the RX 7700S has "Hotpink Bonefish." The MI355X belongs to the Instinct (MIx) generation, and the RX 7700S belongs to the Navi Mobile (RX 7000M) generation.

Process and die details differ substantially. The MI355X uses 3 nm TSMC with 185,000 million transistors on a 2380 mm² die. The RX 7700S uses 6 nm TSMC with 13,300 million transistors on a 204 mm² die. Transistor density is 77.7M per mm² for the MI355X and 65.2M per mm² for the RX 7700S. The MI355X was released on 2025-06-11; the RX 7700S was released on 2023-01-03.

Clock speeds and compute units differ. The MI355X has a base clock of 1000 MHz and a boost clock of 2400 MHz; the RX 7700S has a base clock of 1500 MHz, a boost clock of 2500 MHz, and a game clock of 2200 MHz. The MI355X has 16,384 shading units and 1,024 TMUs; the RX 7700S has 2,048 shading units, 128 TMUs, and 64 ROPs. The MI355X has 0 ROPs and no RT cores; the RX 7700S has 32 RT cores.

Memory and output capabilities differ completely. The MI355X has 288 GB HBM3e with 8192-bit bus and 8.19 TB/s bandwidth; the RX 7700S has 8 GB GDDR6 with 128-bit bus and 288.0 GB/s bandwidth. The MI355X has no display outputs; the RX 7700S has portable-device-dependent outputs. The MI355X has no API support; the RX 7700S supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The MI355X uses PCIe 5.0 x16; the RX 7700S uses PCIe 4.0 x16. The MI355X has a TDP of 1400 W and an OAM module slot; the RX 7700S has a TDP of 100 W and an IGP slot. The MI355X measures 102 mm by 165 mm; the RX 7700S has no dimensions recorded. The MI355X has no production status; the RX 7700S is marked active.