AMD Instinct MI455X vs AMD Radeon RX 7700 Comparison

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark results for the AMD Instinct MI455X versus the AMD Radeon RX 7700. The MI455X has no recorded benchmark scores, an average benchmark score of zero, and no nearest rivals listed. The RX 7700, by contrast, has nine recorded benchmark scores and an average benchmark score of 15,852.

The RX 7700's recorded data shows its strongest result in the Passmark G3D test with a score of 20,974, followed by Geekbench OpenCL at 106,028 and Passmark GPU Compute at 10,963. Its DirectX 11 score of 186 is roughly double its DirectX 12 score of 96, while the DirectX 9 score of 261 leads all DirectX tests. The Passmark G2D score of 1,206 indicates a modest 2D workload capability relative to the 3D figure.

The RX 7700 sits at the 58th percentile among all GPUs in the database. Its nearest rivals show tight competition: the AMD Radeon R9 370X scores 15,862, a 0.1% deficit; the AMD Radeon RX 9060 scores 16,014, a 1% deficit; the AMD Radeon Pro W5500 scores 15,679, a 1.1% surplus; and the NVIDIA GeForce RTX 3060 Ti scores 16,129, a 1.7% deficit. These deltas indicate the RX 7700 lands within a narrow performance band, neither decisively ahead nor behind any of these four cards.

Because the MI455X lacks benchmark entries, no quantitative comparison of compute performance, rasterization, or ray tracing is possible from the recorded data. The wins tally stands at zero for both parts, reflecting the absence of direct measurements rather than an equivalence of performance.

Architecture Differences

The two accelerators come from fundamentally different design lineages within AMD. The Instinct MI455X uses the CDNA 5.0 architecture on the MI450 256CU chip, built for compute-intensive workloads. The Radeon RX 7700 uses the RDNA 3.0 architecture on the Navi 32 chip, built for graphics rendering. The MI455X belongs to the Instinct (MIx) generation, while the RX 7700 belongs to the Navi III (RX 7000) generation.

Manufacturing processes differ sharply. The MI455X uses a 2 nm process node at TSMC, while the RX 7700 uses a 5 nm process node, also at TSMC. Transistor counts reflect the scale gap: the MI455X packs 320,000 million transistors on a 2990 mm² die, yielding a density of 107.0M transistors per mm². The RX 7700 contains 28,100 million transistors on a 346 mm² die, with a density of 81.2M per mm². The MI455X die is roughly 8.6 times larger in area and carries over 11 times more transistors.

Memory subsystems diverge completely. The MI455X uses 432 GB of HBM4 on a 24576-bit bus, delivering 23.3 TB/s of bandwidth. The RX 7700 uses 16 GB of GDDR6 on a 256-bit bus, delivering 624.1 GB/s. The MI455X memory bus is 96 times wider, and its bandwidth is about 37 times higher. Clock behavior also differs: the MI455X runs a 1000 MHz base and 2400 MHz boost, with memory at 1900 MHz (7.6 Gbps effective). The RX 7700 runs a 1900 MHz base, 2041 MHz game clock, 2459 MHz boost, and memory at 2438 MHz (19.5 Gbps effective).

Compute resources show the MI455X's scale. It has 32,768 shading units, 1,024 texture mapping units, and zero ROPs. The RX 7700 has 2,560 shading units, 160 TMUs, 96 ROPs, and 40 ray tracing cores. The MI455X reports no ray tracing cores or tensor cores in the database. Pixel rate for the MI455X is listed as 0 MPixel/s, consistent with a compute-oriented part lacking display outputs. The RX 7700 delivers a 236.1 GPixel/s pixel rate and a 393.4 GTexel/s texture rate. The MI455X texture rate is 2,457.6 GTexel/s, about 6.2 times higher than the RX 7700.

Floating point throughput strongly favors the MI455X. Its FP32 and FP16 figures both read 157.3 TFLOPS with a 1:1 ratio. The RX 7700 delivers 25.18 TFLOPS in both FP32 and FP16, also 1:1. The MI455X therefore provides roughly 6.2 times the FP32 throughput. API support differs: the MI455X lists N/A for DirectX, OpenGL, and Vulkan, while the RX 7700 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Power and physical design separate the two further. The MI455X has a 2300 W TDP, uses an EAM Module slot width, requires no power connectors, and recommends a 2700 W PSU. The RX 7700 has a 200 W TDP, is dual-slot, uses two 8-pin connectors, and recommends a 550 W PSU. The MI455X connects via PCIe 6.0 x16 and has no display outputs. The RX 7700 connects via PCIe 4.0 x16 and offers 1x HDMI 2.1a, 2x DisplayPort 2.1, and 1x USB Type-C. The RX 7700 measures 267 mm in length, 135 mm in height, and 50 mm in width.

Release timing shows the MI455X dated for 2026-07-22 and the RX 7700 for 2025-09-17. The MI455X lists its predecessor as Radeon Instinct with no successor. The RX 7700 lists its predecessor as Navi II and successor as Navi IV. The RX 7700 production status is Active; the MI455X status is not recorded.

The Verdict

The recorded data shows two products with no overlap in measured performance. The RX 7700 has a full benchmark profile and a 58th percentile standing against all GPUs, with an average score of 15,852 that places it within 1.7% of the NVIDIA GeForce RTX 3060 Ti and within 1.1% of the AMD Radeon Pro W5500. The MI455X has no benchmark scores, no rivals, and a 50th percentile placeholder value with an average score of zero.

For graphics workloads, the RX 7700 is the only option with evidence of functionality. Its API support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, combined with display outputs and a 236.1 GPixel/s pixel rate, indicates a complete rasterization pipeline. The MI455X reports no APIs, no display outputs, and zero pixel rate, confirming it is not designed for conventional graphics rendering.

For compute-heavy tasks, the MI455X's specification sheet dominates. Its 157.3 TFLOPS FP32 throughput, 432 GB HBM4 memory, 23.3 TB/s bandwidth, and 32,768 shading units describe a machine designed for large-scale data processing. The RX 7700, with 25.18 TFLOPS and 16 GB GDDR6, operates in a different performance class. The absence of MI455X benchmarks means the database cannot confirm whether its theoretical specifications translate into real-world compute leadership.

The data indicates the RX 7700 is the appropriate choice for any workload requiring graphics output, standard API compatibility, or competitive gaming performance near the RTX 3060 Ti. The MI455X is the appropriate choice for deployments where memory capacity, memory bandwidth, and raw FP32 throughput are the primary criteria, provided the lack of measured benchmarks is acceptable. A 2300 W TDP and 2700 W recommended PSU place severe system integration demands on the MI455X, while the RX 7700's 200 W TDP and 550 W recommendation fit conventional desktop builds.

The RX 7700 sits at the 58th percentile, meaning 58% of all GPUs in the database score lower. Its nearest rival data shows the competitive field is tight: the worst delta is 1.7% behind the RTX 3060 Ti, and the best is 1.1% ahead of the Pro W5500. The MI455X, with no benchmark data, cannot be ranked meaningfully; its 50th percentile value is a default placeholder rather than a measured result.

Specification Differences

The database lists the following fields where the MI455X and RX 7700 differ:

• Architecture: CDNA 5.0 versus RDNA 3.0
• Chip: MI450 256CU versus Navi 32
• Codename: not recorded versus Wheat Nas
• Generation: Instinct (MIx) versus Navi III (RX 7000)
• Process node: 2 nm versus 5 nm
• Transistors: 320,000 million versus 28,100 million
• Die size: 2990 mm² versus 346 mm²
• Transistor density: 107.0M/mm² versus 81.2M/mm²
• Base clock: 1000 MHz versus 1900 MHz
• Boost clock: 2400 MHz versus 2459 MHz
• Game clock: not recorded versus 2041 MHz
• Memory clock: 1900 MHz (7.6 Gbps effective) versus 2438 MHz (19.5 Gbps effective)
• Memory size: 432 GB versus 16 GB
• Memory type: HBM4 versus GDDR6
• Memory bus width: 24576 bit versus 256 bit
• Memory bandwidth: 23.3 TB/s versus 624.1 GB/s
• Shading units: 32,768 versus 2,560
• Texture mapping units: 1,024 versus 160
• ROPs: 0 versus 96
• Ray tracing cores: not recorded versus 40
• Pixel rate: 0 MPixel/s versus 236.1 GPixel/s
• Texture rate: 2,457.6 GTexel/s versus 393.4 GTexel/s
• FP32: 157.3 TFLOPS versus 25.18 TFLOPS
• FP16: 157.3 TFLOPS (1:1) versus 25.18 TFLOPS (1:1)
• TDP: 2300 W versus 200 W
• Slot width: EAM Module versus Dual-slot
• Power connectors: None versus 2x 8-pin
• Suggested PSU: 2700 W versus 550 W
• Bus interface: PCIe 6.0 x16 versus PCIe 4.0 x16
• Display outputs: No outputs versus 1x HDMI 2.1a, 2x DisplayPort 2.1, 1x USB Type-C
• DirectX support: N/A versus 12 Ultimate (12_2)
• OpenGL support: N/A versus 4.6
• Vulkan support: N/A versus 1.4
• Dimensions: not recorded versus 267 mm x 135 mm x 50 mm
• Production status: not recorded versus Active
• Release date: 2026-07-22 versus 2025-09-17
• Predecessor: Radeon Instinct versus Navi II
• Successor: not recorded versus Navi IV

FAQ

Q: Which GPU has higher FP32 compute throughput?

A: The MI455X lists 157.3 TFLOPS FP32, which is about 6.2 times the RX 7700's 25.18 TFLOPS.

Q: How much memory bandwidth does each card provide?

A: The MI455X provides 23.3 TB/s from 432 GB of HBM4 on a 24576-bit bus. The RX 7700 provides 624.1 GB/s from 16 GB of GDDR6 on a 256-bit bus.

Q: Does the MI455X support DirectX or Vulkan?

A: No. The database lists DirectX, OpenGL, and Vulkan support as N/A for the MI455X. The RX 7700 supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Q: What is the RX 7700's standing relative to its nearest rivals?

A: The RX 7700 has an average benchmark score of 15,852. It sits 1.7% behind the NVIDIA GeForce RTX 3060 Ti (16,129), 1% behind the AMD Radeon RX 9060 (16,014), 0.1% behind the AMD Radeon R9 370X (15,862), and 1.1% ahead of the AMD Radeon Pro W5500 (15,679).

Q: What power supply do these cards recommend?

A: The MI455X suggests a 2700 W PSU with a 2300 W TDP and no power connectors, using an EAM Module slot. The RX 7700 suggests a 550 W PSU with a 200 W TDP and two 8-pin connectors.

Q: Do both cards have the same release date?

A: No. The MI455X is dated 2026-07-22, while the RX 7700 is dated 2025-09-17. The RX 7700 production status is Active; the MI455X status is not recorded.

Q: Which card has ray tracing cores?

A: The RX 7700 lists 40 ray tracing cores. The MI455X has no ray tracing core count recorded in the database, and its API support is N/A.