AMD Instinct MI308X vs AMD Radeon 820M Comparison

Where Each One Wins

The AMD Instinct MI308X and AMD Radeon 820M occupy opposite ends of the GPU spectrum, and the recorded data makes that split unambiguous. The MI308X is a compute-oriented accelerator with no display outputs, no gaming API support, and a power envelope of 750 W. The Radeon 820M is an integrated graphics processor designed for portable devices, drawing 15 W and supporting DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

The MI308X wins every category that involves raw compute throughput, memory capacity, and bandwidth. Its FP32 performance is listed at 81.72 TFLOPS, its texture rate is 2,553.6 GTexel/s, and its memory bandwidth is 5.32 TB/s over an 8192-bit bus. These are server-class figures intended for dense numerical workloads. The Radeon 820M delivers 716.8 GFLOPS FP32, 22.40 GTexel/s, and system-dependent memory bandwidth, which places it firmly in the lightweight mobile segment.

The Radeon 820M wins in categories related to integration, efficiency, and modern consumer API coverage. It has a 4 nm process node versus the 5 nm node of the MI308X, a boost clock of 2800 MHz versus 2100 MHz, and a pixel rate of 11.20 GPixel/s compared to 0 MPixel/s for the accelerator. The 820M also includes 2 ray tracing cores, whereas the MI308X lists none. The MI308X cannot output video at all, so any task requiring a display falls to the 820M by default.

The benchmark win count in the database is zero for both parts, as neither has recorded benchmark scores. The percentile versus all GPUs is 50 for both, which reflects the absence of measured data rather than comparable performance. The analysis that follows relies on the specification-level differences captured in the database.

Architecture Differences

The MI308X uses the CDNA 3.0 architecture with the Aqua Vanjaram chip, a design aimed at acceleration workloads. It is manufactured on a 5 nm process at TSMC and contains 153,000 million transistors on a 1017 mm² die, yielding a transistor density of 150.4 million per mm². The architecture exposes no DirectX, OpenGL, or Vulkan API support, confirming that it is not intended for conventional graphics rendering. The chip has 19,456 shading units and 1,216 texture mapping units, but zero ROPs and a pixel rate of 0 MPixel/s, which is consistent with a compute-first design that skips the rasterization pipeline entirely.

The Radeon 820M uses the RDNA 3.5 architecture with the Krackan Point 2 chip, part of the Navi III IGP generation for Strix Point Mobile. It is built on a 4 nm process at TSMC, and its transistor count and die size are recorded as unknown. The architecture supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, making it fully capable of modern graphics APIs. It has 128 shading units, 8 TMUs, 4 ROPs, and 2 ray tracing cores, with a pixel rate of 11.20 GPixel/s and a texture rate of 22.40 GTexel/s.

The two designs diverge sharply in memory architecture. The MI308X uses 192 GB of HBM3 memory on an 8192-bit bus, with a memory clock of 1300 MHz and 5.2 Gbps effective data rate, producing 5.32 TB/s of bandwidth. The Radeon 820M uses system shared memory, with its size, type, bus width, and bandwidth all listed as system dependent. This fundamental difference explains the enormous gap in memory throughput between the two products.

The MI308X connects via PCIe 5.0 x16 and ships as an OAM module with no power connectors and no display outputs. The Radeon 820M connects via PCIe 4.0 x8, is an IGP, has no power connectors, and its display outputs are portable device dependent. The MI308X lists a suggested PSU of 1150 W, while the 820M lists none, reflecting the integrated nature of the latter.

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark results for these two products, so the comparison must be built from the specification records. The largest wins for the MI308X appear in compute throughput and memory bandwidth. Its FP32 figure of 81.72 TFLOPS is roughly 114 times the 716.8 GFLOPS of the Radeon 820M. The texture rate of 2,553.6 GTexel/s is about 114 times the 22.40 GTexel/s of the integrated part. Memory bandwidth of 5.32 TB/s versus system dependent memory is not directly comparable, but the 8192-bit bus and 192 GB HBM3 pool place the MI308X in a different performance class entirely.

The Radeon 820M posts clear wins in clock speed and pixel throughput. Its boost clock of 2800 MHz exceeds the 2100 MHz boost of the MI308X. Its base clock of 400 MHz is lower than the 1000 MHz base of the accelerator, but the mobile part reaches a higher top frequency. The pixel rate of 11.20 GPixel/s versus 0 MPixel/s is a decisive advantage for the 820M, as the MI308X lacks ROPs entirely and cannot perform conventional rasterization.

The Radeon 820M also leads in process technology. The 4 nm node is one generation ahead of the 5 nm node used by the MI308X, which contributes to the much lower 15 W TDP. The MI308X draws 750 W, 50 times the power of the 820M. For mobile or low-power contexts, the 820M is the only viable option, while the MI308X is constrained to systems that can supply 1150 W through the suggested PSU.

The release dates differ by over a year. The MI308X launched on December 5, 2023, while the Radeon 820M launched on February 28, 2025. The MI308X has a predecessor listed as Radeon Instinct, while the 820M lists Navi II IGP as its predecessor. Neither part has a successor recorded in the database.

Specification Differences

The two products differ in nearly every recorded field. The MI308X uses a 5 nm process, while the 820M uses 4 nm. The MI308X has 153,000 million transistors, while the 820M lists unknown. The die size is 1017 mm² for the MI308X and unknown for the 820M. Transistor density is 150.4 million per mm² for the MI308X and null for the 820M.

Clock behavior differs substantially. The MI308X has a base clock of 1000 MHz and a boost clock of 2100 MHz. The 820M has a base clock of 400 MHz and a boost clock of 2800 MHz. Memory clocks are 1300 MHz with 5.2 Gbps effective for the MI308X, while the 820M uses system shared memory with no dedicated clock.

Compute resources are heavily skewed toward the MI308X. It has 19,456 shading units, 1,216 TMUs, and 0 ROPs. The 820M has 128 shading units, 8 TMUs, and 4 ROPs. The MI308X lists no ray tracing cores, while the 820M has 2. Pixel rate is 0 MPixel/s for the MI308X and 11.20 GPixel/s for the 820M. Texture rate is 2,553.6 GTexel/s versus 22.40 GTexel/s.

Memory configurations are fundamentally different. The MI308X has 192 GB of HBM3 on an 8192-bit bus with 5.32 TB/s bandwidth. The 820M has system shared memory with system dependent bandwidth. FP32 and FP16 performance are both 81.72 TFLOPS for the MI308X and 716.8 GFLOPS for the 820M, with both listed at a 1:1 ratio.

Power and form factor diverge completely. The MI308X has a TDP of 750 W, uses an OAM Module slot width, has no power connectors, and suggests a 1150 W PSU. The 820M has a TDP of 15 W, uses an IGP slot width, has no power connectors, and lists no suggested PSU. Bus interfaces are PCIe 5.0 x16 for the MI308X and PCIe 4.0 x8 for the 820M.

API support is exclusive to the 820M. The MI308X lists N/A for DirectX, OpenGL, and Vulkan. The 820M lists DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Display outputs are absent for the MI308X and portable device dependent for the 820M. The production status is unlisted for the MI308X and Active for the 820M.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI308X lists FP32 performance of 81.72 TFLOPS, while the AMD Radeon 820M lists 716.8 GFLOPS. The MI308X delivers over one hundred times the FP32 throughput.

Q: Does the AMD Instinct MI308X support modern graphics APIs?

A: No. The database records DirectX, OpenGL, and Vulkan support as N/A for the MI308X. The Radeon 820M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: What is the power consumption difference between the two?

A: The MI308X has a TDP of 750 W and a suggested PSU of 1150 W. The Radeon 820M has a TDP of 15 W and no suggested PSU listed.

Q: Can the AMD Instinct MI308X output video to a display?

A: No. The MI308X lists no display outputs. The Radeon 820M lists display outputs as portable device dependent.

Q: How does memory capacity compare?

A: The MI308X has 192 GB of HBM3 memory on an 8192-bit bus with 5.32 TB/s bandwidth. The Radeon 820M uses system shared memory with system dependent bandwidth.

Q: Which process node is used by each GPU?

A: The MI308X uses a 5 nm process at TSMC. The Radeon 820M uses a 4 nm process at TSMC.

The Verdict

The data points to a clear separation of purpose. The AMD Instinct MI308X is built for compute-heavy environments that require massive memory capacity, extreme bandwidth, and high FP32 throughput. Its 192 GB HBM3 pool, 8192-bit bus, and 81.72 TFLOPS FP32 performance make it suitable for workloads that fit a server accelerator with a 750 W TDP. The absence of display outputs and graphics API support means it cannot serve any interactive or rendering role.

The AMD Radeon 820M is an integrated part for portable devices. Its 15 W TDP, 4 nm process, and 2800 MHz boost clock fit a low-power design. The 2 ray tracing cores, DirectX 12 Ultimate support, and 11.20 GPixel/s pixel rate give it a functional graphics pipeline that the MI308X completely lacks. The system shared memory configuration ties its bandwidth to the host platform.

For any task involving rasterization, ray tracing, or standard graphics APIs, the Radeon 820M is the only choice between the two. For any task requiring dense compute with enormous memory bandwidth and capacity, the Instinct MI308X is the only choice. The two products do not compete in the same market, and the recorded specifications confirm that neither can substitute for the other in its intended role.