AMD Radeon 820M vs NVIDIA GeForce RTX 5090 Mobile Comparison

FAQ

Q: What are the core architectural differences between the AMD Radeon 820M and NVIDIA GeForce RTX 5090 Mobile?

A: The AMD Radeon 820M uses the RDNA 3.5 architecture on a 4 nm TSMC process with 128 shading units, while the NVIDIA GeForce RTX 5090 Mobile uses Blackwell 2.0 on a 5 nm TSMC process with 10,496 shading units. The RTX 5090 Mobile integrates 82 ray tracing cores and 328 tensor cores, whereas the Radeon 820M has 2 ray tracing cores and no tensor cores.

Q: How do the memory configurations compare?

A: The Radeon 820M uses system shared memory with system-dependent bandwidth, while the RTX 5090 Mobile has 24 GB of GDDR7 memory on a 256-bit bus with 896.0 GB/s bandwidth. The Radeon 820M's memory clock is listed as "System Shared" with no dedicated bus width.

Q: Which GPU has a higher benchmark percentile ranking?

A: The RTX 5090 Mobile ranks in the 84th percentile among all GPUs, while the Radeon 820M sits at the 50th percentile. The RTX 5090 Mobile also has an average benchmark score of 45,152, whereas the Radeon 820M's average benchmark score is 0 with no recorded benchmark entries.

Q: What is the FP32 compute performance of each GPU?

A: The Radeon 820M delivers 716.8 GFLOPS of FP32 compute, while the RTX 5090 Mobile delivers 31.80 TFLOPS. Both GPUs have a 1:1 FP16 to FP32 ratio.

Q: When were these GPUs released?

A: The AMD Radeon 820M was released on 2025-02-28, and the NVIDIA GeForce RTX 5090 Mobile was released on 2025-03-26.

Q: What are the TDP ratings for each GPU?

A: The Radeon 820M has a TDP of 15 W, while the RTX 5090 Mobile has a TDP of 95 W. Both are classified as IGP (integrated graphics processor) with no power connectors.

Architecture Differences

The AMD Radeon 820M is built on the RDNA 3.5 architecture, fabricated at TSMC on a 4 nm process node. It belongs to the Navi III IGP generation for Strix Point Mobile and uses the Krackan Point 2 chip. The GPU integrates 128 shading units, 8 texture mapping units, and 4 render output units. It includes 2 ray tracing cores, which aligns with the RDNA 3.5 feature set for entry-level integrated graphics. The Radeon 820M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Its base clock is 400 MHz with a boost clock of 2800 MHz. The transistor count and die size are listed as unknown, and the PCIe interface is PCIe 4.0 x8.

The NVIDIA GeForce RTX 5090 Mobile uses the Blackwell 2.0 architecture on TSMC's 5 nm process, built around the GB203 chip. This is a GeForce 50-series part in the GeForce 50 Mobile generation. The GPU packs 10,496 shading units, 328 TMUs, and 112 ROPs, along with 82 ray tracing cores and 328 tensor cores. The transistor count is 45,600 million on a die size of 378 mm², giving a transistor density of 120.6 million transistors per square millimeter. Base clock is 990 MHz with a boost clock of 1515 MHz, and memory runs at 1750 MHz with 28 Gbps effective speed. The RTX 5090 Mobile uses a PCIe 5.0 x16 interface and also supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

The architectural gap is substantial. The Radeon 820M represents the low-power integrated segment with a minimal execution resource pool, while the RTX 5090 Mobile is a full laptop discrete GPU with over 80 times the shading units. The RTX 5090 Mobile has 328 tensor cores for AI acceleration, which the Radeon 820M lacks entirely. Ray tracing capabilities differ by an order of magnitude: 82 RT cores versus 2. The process node difference is notable as well, with the AMD part using a smaller 4 nm node versus NVIDIA's 5 nm node, though the NVIDIA chip packs vastly more transistors.

Head-to-Head Benchmarks

The database contains no head-to-head benchmark entries between these two GPUs, and the Radeon 820M has no recorded benchmark scores in any test suite. The RTX 5090 Mobile, by contrast, has ten documented benchmark results across multiple test suites.

In 3DMark Steel Nomad DX12, the RTX 5090 Mobile scores 5,871. In Geekbench OpenCL, it reaches 201,834, and in Geekbench Vulkan, it scores 198,405. The Passmark suite shows a wide spread: DirectX 9 scores 324, DirectX 10 scores 183, DirectX 11 scores 269, and DirectX 12 scores 138. Passmark G2D scores 1,057, while Passmark G3D scores 30,034. Passmark GPU compute scores 13,401.

The average benchmark score for the RTX 5090 Mobile is 45,152, placing it in the 84th percentile of all GPUs. Its nearest rivals in the database are the AMD Radeon Pro 5500 XT with an average score of 45,384 and a delta of -0.5%, the NVIDIA GeForce RTX 4070 Ti with 44,795 and a delta of 0.8%, the Intel Arc A730M with 45,592 and a delta of -1%, and the NVIDIA RTX 5880 Ada Generation with 45,972 and a delta of -1.8%. These deltas indicate that the RTX 5090 Mobile sits within roughly 2% of these established desktop and mobile GPUs, showing competitive positioning despite being a laptop part.

Because the Radeon 820M has no benchmark scores, no direct performance comparison can be made from recorded data. The database shows zero wins for the Radeon 820M and zero wins for the RTX 5090 Mobile in head-to-head testing, reflecting the absence of paired benchmark runs.

Specification Differences

The two GPUs differ across nearly every recorded specification field:

• Process Node: AMD Radeon 820M uses 4 nm; NVIDIA RTX 5090 Mobile uses 5 nm, both from TSMC.
• Transistors: The Radeon 820M lists "unknown"; the RTX 5090 Mobile has 45,600 million.
• Die Size: The Radeon 820M lists "unknown"; the RTX 5090 Mobile has 378 mm².
• Transistor Density: The Radeon 820M is null; the RTX 5090 Mobile has 120.6M per mm².
• Base Clock: 400 MHz versus 990 MHz.
• Boost Clock: 2800 MHz versus 1515 MHz.
• Memory Clock: "System Shared" versus 1750 MHz with 28 Gbps effective.
• Memory Size: System Shared versus 24 GB GDDR7.
• Memory Bus: System Shared versus 256-bit.
• Memory Bandwidth: System Dependent versus 896.0 GB/s.
• Shading Units: 128 versus 10,496.
• TMUs: 8 versus 328.
• ROPs: 4 versus 112.
• RT Cores: 2 versus 82.
• Tensor Cores: None versus 328.
• Pixel Rate: 11.20 GPixel/s versus 169.7 GPixel/s.
• Texture Rate: 22.40 GTexel/s versus 496.9 GTexel/s.
• FP32 Compute: 716.8 GFLOPS versus 31.80 TFLOPS.
• FP16 Compute: 716.8 GFLOPS (1:1) versus 31.80 TFLOPS (1:1).
• TDP: 15 W versus 95 W.
• Bus Interface: PCIe 4.0 x8 versus PCIe 5.0 x16.
• Release Date: 2025-02-28 versus 2025-03-26.
• Predecessor: Navi II IGP versus GeForce 40 Mobile.

The only identical fields are slot width (IGP), power connectors (None), display outputs (Portable Device Dependent), DirectX version (12 Ultimate 12_2), OpenGL version (4.6), and Vulkan version (1.4). Production status for both is Active.

Where Each One Wins

The RTX 5090 Mobile wins decisively in every measurable performance category based on recorded data. Its FP32 compute of 31.80 TFLOPS is roughly 44 times higher than the Radeon 820M's 716.8 GFLOPS. Pixel rate is 169.7 GPixel/s versus 11.20 GPixel/s, a 15-fold advantage. Texture rate is 496.9 GTexel/s versus 22.40 GTexel/s, a 22-fold advantage. The RTX 5090 Mobile also has 24 GB of dedicated GDDR7 memory with 896.0 GB/s bandwidth, while the Radeon 820M relies on system shared memory with bandwidth that depends on the host system.

The Radeon 820M wins in power efficiency on paper, with a 15 W TDP versus 95 W for the RTX 5090 Mobile. It also has a higher boost clock at 2800 MHz versus 1515 MHz, though this is offset by far fewer execution units. The smaller 4 nm process node gives the AMD part a manufacturing advantage in transistor geometry, but the NVIDIA chip packs dramatically more transistors overall.

For use cases, the Radeon 820M suits ultra-portable, low-power devices where the 15 W TDP and integrated form factor are priorities. It can handle basic graphics output, light 2D workloads, and entry-level compute through its 128 shading units. The RTX 5090 Mobile targets high-performance laptops needing substantial graphics throughput, ray tracing acceleration with 82 RT cores, and AI workloads through 328 tensor cores. Its 24 GB memory capacity supports large datasets and high-resolution textures that the shared-memory Radeon 820M cannot accommodate.

The Verdict

The benchmark data shows a complete performance separation between these two GPUs. The RTX 5090 Mobile's average benchmark score of 45,152 places it in the 84th percentile of all GPUs, with nearest rivals including the AMD Radeon Pro 5500 XT, NVIDIA GeForce RTX 4070 Ti, Intel Arc A730M, and NVIDIA RTX 5880 Ada Generation, all within 1.8% of its average score. The Radeon 820M has no recorded benchmark scores and a 50th percentile ranking, which in the context of this database means it has no verified performance data to compare.

The architectural gap is fundamental rather than incremental. The RTX 5090 Mobile uses 10,496 shading units, 328 TMUs, and 112 ROPs against the Radeon 820M's 128, 8, and 4 respectively. The 82 RT cores versus 2 and 328 tensor cores versus none further widen the feature gap. The RTX 5090 Mobile delivers 31.80 TFLOPS FP32 versus 716.8 GFLOPS, and its memory bandwidth of 896.0 GB/s is a discrete-class specification, while the Radeon 820M's memory bandwidth is system dependent.

For users selecting between these two, the choice depends entirely on the target platform. The Radeon 820M fits in systems where a 15 W integrated GPU is the only viable option, such as thin-and-light portable devices. The RTX 5090 Mobile is designed for high-performance laptops where 95 W of power budget is acceptable and where features like ray tracing, tensor acceleration, and 24 GB of GDDR7 memory provide tangible benefits. The release dates are close, with the Radeon 820M launching on 2025-02-28 and the RTX 5090 Mobile on 2025-03-26, but their performance brackets are far apart. The data supports the RTX 5090 Mobile as the overwhelmingly faster GPU in every recorded metric, while the Radeon 820M remains a low-power integrated option with no benchmark confirmation of its capabilities.