AMD Radeon 8065S vs NVIDIA GeForce RTX 4080 Mobile Comparison

FAQ

Q: What are the core architectural differences between the AMD Radeon 8065S and the NVIDIA GeForce RTX 4080 Mobile?

A: The AMD Radeon 8065S uses the Gorgon Halo chip built on RDNA 3.5 architecture with a 4 nm TSMC process. The NVIDIA GeForce RTX 4080 Mobile uses the AD104 chip based on Ada Lovelace architecture with a 5 nm TSMC process.

Q: How do the memory configurations differ between these two mobile GPUs?

A: The AMD Radeon 8065S uses system-shared memory with system-dependent bandwidth, while the NVIDIA GeForce RTX 4080 Mobile has 12 GB of dedicated GDDR6 memory on a 192-bit bus with 432.0 GB/s bandwidth.

Q: Which GPU has higher shading unit and ray tracing core counts?

A: The NVIDIA GeForce RTX 4080 Mobile has 7424 shading units and 58 ray tracing cores, compared to 2560 shading units and 40 ray tracing cores on the AMD Radeon 8065S.

Q: What is the thermal design power difference between the two?

A: The AMD Radeon 8065S has a 55 W TDP, while the NVIDIA GeForce RTX 4080 Mobile has a 110 W TDP, making the AMD part substantially more power-efficient.

Q: Which GPU supports newer PCIe technology?

A: The AMD Radeon 8065S supports PCIe 5.0 x16, while the NVIDIA GeForce RTX 4080 Mobile supports PCIe 4.0 x16.

Q: What does the benchmark percentile data show for the RTX 4080 Mobile?

A: The NVIDIA GeForce RTX 4080 Mobile sits at the 81st percentile among all GPUs in the database, with an average benchmark score of 38135. The AMD Radeon 8065S has a 50th percentile ranking with no recorded benchmark scores.

Where Each One Wins

The data shows a clear split between these two mobile GPUs. The NVIDIA GeForce RTX 4080 Mobile wins decisively in raw compute performance, as indicated by its substantial shading unit advantage (7424 versus 2560) and higher FP32 throughput. The recorded benchmarks for the RTX 4080 Mobile confirm this dominance across multiple DirectX tests: PassMark DirectX 11 scores reach 244, DirectX 10 scores 157, and DirectX 12 scores 96. The RTX 4080 Mobile also completes the PassMark G3D test with a score of 24926 and GPU compute with 11191.

The AMD Radeon 8065S wins in power efficiency and interface technology. With a 55 W TDP versus 110 W, the Radeon part delivers its performance at half the thermal budget. The Radeon 8065S also supports PCIe 5.0 x16, offering double the interface bandwidth potential compared to the RTX 4080 Mobile's PCIe 4.0 x16. Additionally, the Radeon 8065S achieves a higher pixel rate of 192.0 GPixel/s and texture rate of 480.0 GTexel/s, despite having fewer total execution resources, indicating higher per-clock efficiency.

For workloads that depend on memory bandwidth, the NVIDIA RTX 4080 Mobile's dedicated 432.0 GB/s GDDR6 configuration provides consistent, predictable performance. The Radeon 8065S relies on system-shared memory with system-dependent bandwidth, making its memory performance vary with the host system configuration.

Architecture Differences

The two GPUs represent fundamentally different design philosophies. The AMD Radeon 8065S uses RDNA 3.5 architecture on a 4 nm TSMC process, fabricated as a 308 mm² die. The chip, codenamed Gorgon Halo, belongs to the Navi Mobile generation within the RX 8000M series. The NVIDIA GeForce RTX 4080 Mobile uses Ada Lovelace architecture on a 5 nm TSMC process, with a 294 mm² die containing 35,800 million transistors at a density of 121.8 million transistors per mm².

The AMD design integrates 2560 shading units, 160 texture mapping units, and 64 ROPs, alongside 40 ray tracing cores. The NVIDIA design packs 7424 shading units, 232 TMUs, and 80 ROPs, with 58 ray tracing cores and 232 tensor cores. This represents a nearly 3x advantage in shading units for NVIDIA.

Clock behavior differs significantly. The AMD Radeon 8065S has a 1295 MHz base clock and boosts to 3000 MHz, while the NVIDIA RTX 4080 Mobile operates at 1290 MHz base and 1665 MHz boost. The Radeon's higher boost clock partially compensates for its lower core count, leading to its competitive pixel and texture rates.

Both GPUs support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Neither requires power connectors, and both are integrated into portable devices with display outputs dependent on the specific system. The AMD part is produced on a smaller 4 nm node, while NVIDIA uses 5 nm, and both are fabricated by TSMC.

Specification Differences

The recorded specifications show these two GPUs differ in nearly every measurable category. The AMD Radeon 8065S uses a 4 nm process, while the NVIDIA RTX 4080 Mobile uses 5 nm. Die sizes are close: 308 mm² for AMD versus 294 mm² for NVIDIA, but the transistor count differs dramatically: unknown for AMD versus 35,800 million for NVIDIA.

Memory configurations are fundamentally different. The Radeon 8065S uses system-shared memory with system-dependent bandwidth. The RTX 4080 Mobile uses 12 GB of GDDR6 with a 192-bit bus and 432.0 GB/s bandwidth, running at 2250 MHz with 18 Gbps effective speed.

Core counts show NVIDIA's advantage: 7424 shading units versus 2560, 232 TMUs versus 160, 80 ROPs versus 64, 58 RT cores versus 40, and 232 tensor cores versus none listed for AMD. Clock speeds favor AMD: 3000 MHz boost versus 1665 MHz boost, though base clocks are nearly identical at 1295 MHz versus 1290 MHz.

The Radeon 8065S achieves 192.0 GPixel/s pixel rate and 480.0 GTexel/s texture rate, both higher than the RTX 4080 Mobile's 133.2 GPixel/s and 386.3 GTexel/s. FP32 throughput favors NVIDIA: 24.72 TFLOPS versus 15.36 TFLOPS, with both offering 1:1 FP16 ratios.

Power requirements differ substantially: 55 W TDP for the Radeon 8065S versus 110 W for the RTX 4080 Mobile. The Radeon uses PCIe 5.0 x16, while NVIDIA uses PCIe 4.0 x16. The NVIDIA part was released in January 2023 with a predecessor in the GeForce 30 Mobile series and successor in the GeForce 50 Mobile series. The AMD part has a 2025 release date and lists Polaris Mobile as its predecessor.

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark comparisons between these two GPUs, and the AMD Radeon 8065S has no recorded individual benchmark scores. The NVIDIA GeForce RTX 4080 Mobile, however, has nine recorded benchmark results that establish its performance baseline.

In compute workloads, the RTX 4080 Mobile scores 159575 in Geekbench OpenCL and 145807 in Geekbench Vulkan. These results place it well above the database average for mobile GPUs. The PassMark suite confirms strong DirectX performance: 244 in DirectX 11, 157 in DirectX 10, 96 in DirectX 12, and 286 in DirectX 9. The GPU achieves a PassMark G3D score of 24926 and a GPU compute score of 11191, with a 2D score of 929.

The RTX 4080 Mobile's average benchmark score of 38135 places it at the 81st percentile among all GPUs in the database. Its nearest rivals show tight competition: the NVIDIA GeForce MX570 scores 38299 (0.4% higher), the RTX 5080 Mobile scores 38349 (0.6% higher), while the RTX 4070 scores 37648 (1.3% lower) and the Tesla P4 scores 37628 (1.3% lower).

Given the RTX 4080 Mobile's 61% higher FP32 throughput (24.72 TFLOPS versus 15.36 TFLOPS) and nearly 3x shading unit count, the recorded data indicates the NVIDIA part would dominate compute-heavy and rasterization workloads. The Radeon 8065S counters with a 3000 MHz boost clock, 18% higher pixel rate, and 24% higher texture rate, suggesting stronger per-clock efficiency in specific throughput-bound scenarios.

The Verdict

The recorded data supports a clear decision framework. The NVIDIA GeForce RTX 4080 Mobile delivers substantially higher raw compute performance, with 24.72 TFLOPS FP32, 7424 shading units, and 58 ray tracing cores. Its 81st percentile ranking and 38135 average benchmark score place it firmly in the high-performance tier, and its dedicated 12 GB GDDR6 memory with 432.0 GB/s bandwidth provides consistent memory performance.

Users requiring maximum frame rates in DirectX workloads, demanding ray tracing, or compute-heavy applications should select the RTX 4080 Mobile. Its benchmark scores across Geekbench OpenCL (159575) and Vulkan (145807) confirm strong API-level performance, and its nearest rival comparisons show it trading closely with newer and older NVIDIA parts.

The AMD Radeon 8065S serves a different purpose. Its 55 W TDP represents half the power requirement of the RTX 4080 Mobile, making it suitable for thinner, cooler, and more battery-efficient portable systems. The 4 nm process node and 3000 MHz boost clock indicate architectural efficiency that partially offsets its lower core count. Its 192.0 GPixel/s pixel rate and 480.0 GTexel/s texture rate exceed the NVIDIA part's corresponding figures, suggesting strong fill-rate performance for its power envelope.

Users prioritizing battery life, thermal management, and portability should choose the Radeon 8065S. The system-shared memory architecture means performance scales with the host system's memory configuration, making it a flexible option for unified memory designs. Its PCIe 5.0 x16 interface provides future-proofing for high-bandwidth system communication.

The absence of benchmark scores for the Radeon 8065S in the database limits direct quantitative comparison. The RTX 4080 Mobile's recorded results establish it as the performance leader, while the Radeon 8065S offers a compelling efficiency alternative based on its specifications. The choice ultimately depends on whether raw performance or power efficiency takes priority in the target system design.