AMD Radeon 820M vs AMD Ryzen Z2 GPU Comparison

Head-to-Head Benchmarks

The recorded data shows no direct benchmark scores for either the AMD Radeon 820M or the AMD Ryzen Z2 GPU. Both entries have an average benchmark score of zero and an empty head-to-head benchmark list. However, the hardware specifications provide clear performance deltas that can be projected from the architecture.

The AMD Ryzen Z2 GPU delivers dramatically higher compute throughput. Its FP32 performance is 8.294 TFLOPS, while the AMD Radeon 820M produces 716.8 GFLOPS. That is an 11.6x difference in raw floating-point output in favor of the Ryzen Z2 GPU. The texture rate reinforces this gap: the Ryzen Z2 GPU processes 129.6 GTexel/s versus 22.40 GTexel/s for the Radeon 820M, a 5.8x advantage. Pixel throughput also favors the Ryzen Z2 GPU at 86.40 GPixel/s compared to 11.20 GPixel/s, a 7.7x difference.

The Ryzen Z2 GPU carries 768 shading units, 48 texture mapping units, and 32 raster operation units. The Radeon 820M has 128 shading units, 8 TMUs, and 4 ROPs. These counts align with the measured throughput deltas. The Ryzen Z2 GPU also integrates 12 ray tracing cores, whereas the Radeon 820M has 2. In ray-traced workloads, the Ryzen Z2 GPU should scale accordingly, though no direct RT benchmark scores exist in the database.

Memory bandwidth is another decisive divider. The Ryzen Z2 GPU uses 16 GB of LPDDR5X memory on a 128-bit bus with 119.9 GB/s bandwidth. The Radeon 820M uses system shared memory with bandwidth listed as system dependent. This means the Radeon 820M's memory performance varies with the host platform, while the Ryzen Z2 GPU has a fixed, dedicated memory subsystem that avoids contention with CPU memory traffic.

Clock behavior differs as well. The Radeon 820M has a base clock of 400 MHz and a boost clock of 2800 MHz. The Ryzen Z2 GPU has a higher base clock of 800 MHz but a slightly lower boost clock of 2700 MHz. The Ryzen Z2 GPU also has a memory clock of 937 MHz with 7.5 Gbps effective transfer rate. The Radeon 820M's memory clock is tied to system shared memory, so it cannot be stated as a fixed value.

Both GPUs support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Both are built on TSMC's 4 nm process. The Ryzen Z2 GPU has a transistor count of 25,390 million on a 178 mm² die, with a transistor density of 142.6M per mm². The Radeon 820M's transistor count and die size are unknown in the database. The Ryzen Z2 GPU integrates a larger and denser chip, which supports its higher compute resource counts.

Power consumption scales with performance. The Ryzen Z2 GPU has a TDP of 28 W, while the Radeon 820M has a TDP of 15 W. The Ryzen Z2 GPU uses nearly double the power budget, which explains its ability to sustain higher clocks and house more execution units. The Radeon 820M operates at a lower power envelope, which indicates a design priority for efficiency over peak throughput.

Neither GPU has a launch MSRP listed, so no pricing data is available for comparison.

FAQ

Q: Which GPU has higher raw compute performance?

A: The AMD Ryzen Z2 GPU. Its FP32 throughput is 8.294 TFLOPS versus 716.8 GFLOPS for the AMD Radeon 820M, an 11.6x advantage. It also has 768 shading units versus 128.

Q: How do the memory systems compare?

A: The Ryzen Z2 GPU has 16 GB of LPDDR5X memory on a 128-bit bus with 119.9 GB/s bandwidth. The Radeon 820M uses system shared memory with bandwidth listed as system dependent, meaning performance relies on the host platform.

Q: Are both GPUs built on the same process node?

A: Yes, both use TSMC's 4 nm process. The Ryzen Z2 GPU has a transistor count of 25,390 million on a 178 mm² die. The Radeon 820M's transistor count and die size are not recorded.

Q: What is the power draw difference?

A: The Ryzen Z2 GPU has a TDP of 28 W, while the Radeon 820M has a TDP of 15 W. The Ryzen Z2 GPU consumes nearly double the power, corresponding to its larger execution resource pool.

Q: Do both GPUs support the same graphics APIs?

A: Yes. Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: Which GPU has more ray tracing cores?

A: The Ryzen Z2 GPU has 12 ray tracing cores, while the Radeon 820M has 2. This indicates a sixfold difference in RT hardware capacity.

The Verdict

The data indicates a clear performance hierarchy. The AMD Ryzen Z2 GPU dominates in every measured compute metric: FP32 throughput, texture rate, pixel rate, shading units, TMUs, ROPs, ray tracing cores, and dedicated memory bandwidth. The Radeon 820M only leads in boost clock speed (2800 MHz versus 2700 MHz) and lower TDP (15 W versus 28 W).

For workloads that stress raw graphics throughput, rendering, or ray tracing, the Ryzen Z2 GPU is the obvious choice based on the recorded specifications. Its 8.294 TFLOPS FP32 output and 119.9 GB/s dedicated bandwidth place it in a different class than the Radeon 820M. The Radeon 820M, by contrast, fits scenarios where power consumption must stay minimal and memory bandwidth is acceptable from shared system resources.

The Ryzen Z2 GPU's 12 RT cores versus 2 RT cores means it handles ray-traced effects far more effectively. The Radeon 820M's 400 MHz base clock and 128 shading units suggest it is designed for light graphical duties, not demanding 3D workloads. The Ryzen Z2 GPU's 800 MHz base clock and 768 shading units confirm its positioning as a more capable integrated graphics solution.

Users with 28 W power budgets and a need for sustained gaming or compute performance should favor the Ryzen Z2 GPU. Users constrained to 15 W platforms, such as ultraportable designs, would rely on the Radeon 820M, accepting lower frame rates and reduced feature performance for the power savings.

Specification Differences

The following fields differ between the two GPUs:

• Chip: Radeon 820M uses Krackan Point 2; Ryzen Z2 GPU uses Hawk Point.
• Architecture: Radeon 820M uses RDNA 3.5; Ryzen Z2 GPU uses RDNA 3.0.
• Generation: Radeon 820M is Navi III IGP (Strix Point Mobile); Ryzen Z2 GPU is Console GPU (AMD).
• Transistors: Radeon 820M unknown; Ryzen Z2 GPU 25,390 million.
• Die Size: Radeon 820M unknown; Ryzen Z2 GPU 178 mm².
• Transistor Density: Radeon 820M null; Ryzen Z2 GPU 142.6M / mm².
• Base Clock: Radeon 820M 400 MHz; Ryzen Z2 GPU 800 MHz.
• Boost Clock: Radeon 820M 2800 MHz; Ryzen Z2 GPU 2700 MHz.
• Memory Clock: Radeon 820M system shared; Ryzen Z2 GPU 937 MHz, 7.5 Gbps effective.
• Memory Size: Radeon 820M system shared; Ryzen Z2 GPU 16 GB.
• Memory Type: Radeon 820M system shared; Ryzen Z2 GPU LPDDR5X.
• Memory Bus Width: Radeon 820M system shared; Ryzen Z2 GPU 128 bit.
• Memory Bandwidth: Radeon 820M system dependent; Ryzen Z2 GPU 119.9 GB/s.
• Shading Units: Radeon 820M 128; Ryzen Z2 GPU 768.
• TMUs: Radeon 820M 8; Ryzen Z2 GPU 48.
• ROPs: Radeon 820M 4; Ryzen Z2 GPU 32.
• RT Cores: Radeon 820M 2; Ryzen Z2 GPU 12.
• Pixel Rate: Radeon 820M 11.20 GPixel/s; Ryzen Z2 GPU 86.40 GPixel/s.
• Texture Rate: Radeon 820M 22.40 GTexel/s; Ryzen Z2 GPU 129.6 GTexel/s.
• FP32: Radeon 820M 716.8 GFLOPS; Ryzen Z2 GPU 8.294 TFLOPS.
• FP16: Radeon 820M 716.8 GFLOPS (1:1); Ryzen Z2 GPU 8.294 TFLOPS (1:1).
• TDP: Radeon 820M 15 W; Ryzen Z2 GPU 28 W.
• Slot Width: Radeon 820M IGP; Ryzen Z2 GPU null.
• Bus Interface: Radeon 820M PCIe 4.0 x8; Ryzen Z2 GPU null.
• Display Outputs: Radeon 820M portable device dependent; Ryzen Z2 GPU 1x USB Type-C.
• Release Date: Radeon 820M 2025-02-28; Ryzen Z2 GPU 2024-12-31.

Architecture Differences

The two GPUs come from different architectural generations even though both use TSMC's 4 nm process. The Radeon 820M is based on RDNA 3.5 and belongs to the Navi III IGP (Strix Point Mobile) generation. The Ryzen Z2 GPU uses RDNA 3.0 and is classified as a Console GPU (AMD). The Radeon 820M's chip is Krackan Point 2, while the Ryzen Z2 GPU uses Hawk Point.

The Ryzen Z2 GPU has 25,390 million transistors on a 178 mm² die, resulting in a transistor density of 142.6M per mm². The Radeon 820M's transistor count and die size are not recorded in the database. The Ryzen Z2 GPU's larger physical implementation enables 768 shading units, 48 TMUs, 32 ROPs, and 12 RT cores. The Radeon 820M packs 128 shading units, 8 TMUs, 4 ROPs, and 2 RT cores into its design.

Clock strategies differ. The Radeon 820M has a lower base clock of 400 MHz but a higher boost clock of 2800 MHz. The Ryzen Z2 GPU starts at 800 MHz base and boosts to 2700 MHz. The Radeon 820M's higher boost clock does not compensate for its smaller execution resource pool, as its peak FP32 output (716.8 GFLOPS) is far below the Ryzen Z2 GPU's 8.294 TFLOPS.

Memory architecture is the most significant structural difference. The Radeon 820M relies entirely on system shared memory. Its bus width, bandwidth, and memory clock are all system dependent. The Ryzen Z2 GPU has a fixed memory subsystem: 16 GB LPDDR5X, 128-bit bus, 119.9 GB/s bandwidth, and a 937 MHz memory clock with 7.5 Gbps effective transfer. This dedicated memory arrangement provides predictable performance regardless of host platform.

Both GPUs support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The Radeon 820M connects via PCIe 4.0 x8; the Ryzen Z2 GPU's bus interface is not specified. The Radeon 820M is an IGP with portable device dependent display outputs. The Ryzen Z2 GPU has a single USB Type-C display output.

The power architectures reflect the performance split. The Radeon 820M operates at 15 W TDP, the Ryzen Z2 GPU at 28 W. The 13 W difference corresponds to the Ryzen Z2 GPU's higher resource counts and dedicated memory controller. The Radeon 820M's lower power draw suits constrained mobile designs, while the Ryzen Z2 GPU's higher budget supports its larger compute array.

Where Each One Wins

The AMD Ryzen Z2 GPU wins in every throughput-oriented category. Its FP32 performance of 8.294 TFLOPS versus 716.8 GFLOPS makes it the choice for compute-heavy tasks. The texture rate of 129.6 GTexel/s versus 22.40 GTexel/s favors it for texture-bound rendering. The pixel rate of 86.40 GPixel/s versus 11.20 GPixel/s gives it the edge in fill-rate-limited scenes. The 12 RT cores versus 2 RT cores make it the pick for ray-traced lighting and reflections. The 16 GB LPDDR5X memory with 119.9 GB/s bandwidth supports larger textures and higher resolutions without system memory contention.

The AMD Radeon 820M wins in power efficiency. Its 15 W TDP versus 28 W TDP means it fits into lower-power platforms. Its 2800 MHz boost clock exceeds the Ryzen Z2 GPU's 2700 MHz boost, so in short burst workloads where the execution units are not saturated, the Radeon 820M may reach peak frequency more quickly. Its system shared memory approach also means it requires no dedicated memory allocation, reducing platform cost and complexity.

The Radeon 820M suits lightweight integrated graphics duties: basic display output, video playback, and light 2D workloads. The Ryzen Z2 GPU suits gaming, 3D rendering, and compute applications where its larger shader array and dedicated memory bandwidth can be fully utilized. The Ryzen Z2 GPU's console classification and 178 mm² die with 25,390 million transistors indicate a design intended for sustained, demanding workloads.

The Radeon 820M's PCIe 4.0 x8 interface provides host connectivity, while the Ryzen Z2 GPU's bus interface is unlisted. Both support the same modern graphics APIs, so software compatibility is not a differentiator. The Ryzen Z2 GPU's release date of 2024-12-31 precedes the Radeon 820M's 2025-02-28 release, but both remain in active production status.

For any workload that stresses the GPU pipeline, the data points decisively to the Ryzen Z2 GPU. For ultra-low-power platforms where 15 W is the ceiling, the Radeon 820M is the only viable option between these two.