AMD Radeon RX 6650M XT vs NVIDIA RTX 4000 Ada Generation Comparison

The Verdict

The benchmark data presents a clear hierarchy between these two GPUs. The NVIDIA RTX 4000 Ada Generation is the decisive winner in the only recorded head-to-head test, the Geekbench OpenCL benchmark, where it scores 146593 against the AMD Radeon RX 6650M XT's 76904, a 90.6% advantage. The recorded data shows a 91st percentile ranking for the AMD part, while the NVIDIA card sits at the 95th percentile across all GPUs.

The RTX 4000 Ada Generation is the choice for professionals and workstation users who prioritize raw compute throughput. Its average benchmark score of 135218 places it in a peer group with the NVIDIA A10M (135230, 0% difference), AMD Radeon PRO W6800 (135396, -0.1% behind), and AMD Radeon Pro W6800X Duo (135774, -0.4% behind). These are all high-end workstation parts, and the RTX 4000 Ada Generation sits comfortably among them.

The AMD Radeon RX 6650M XT, with an average score of 76904, is a mobile-focused part. Its nearest rivals include the NVIDIA GeForce RTX 5090 D (77712, 1% ahead), AMD Radeon RX 6850M XT (78940, 2.6% ahead), and NVIDIA Tesla P100 variants. This places it in a lower performance tier entirely. The data indicates this is not a contest of equals; it is a comparison between a desktop workstation GPU and a mobile laptop GPU, with the desktop part dominating the compute performance metrics.

Architecture Differences

The two GPUs are built on fundamentally different architectures. The NVIDIA RTX 4000 Ada Generation uses the AD104 chip based on the Ada Lovelace architecture, manufactured on a 5 nm process at TSMC. The AMD Radeon RX 6650M XT uses the Navi 23 chip based on RDNA 2.0, manufactured on a 7 nm process, also at TSMC. The process node difference is significant: the NVIDIA part packs 35,800 million transistors into a 294 mm² die, resulting in a transistor density of 121.8M per mm². The AMD chip has 11,060 million transistors on a 237 mm² die, for a density of 46.7M per mm².

This architectural disparity manifests in the compute resources. The RTX 4000 Ada Generation features 6144 shading units, 192 texture mapping units, 64 raster output units, 48 ray tracing cores, and 192 tensor cores. The RX 6650M XT offers 2048 shading units, 128 TMUs, 64 ROPs, and 32 ray tracing cores, with no tensor cores listed. The NVIDIA part also has a much larger memory subsystem: 20 GB of GDDR6 on a 160-bit bus with 360.0 GB/s bandwidth, versus 8 GB of GDDR6 on a 128-bit bus with 256.0 GB/s bandwidth for the AMD part.

Clock speeds tell an interesting story. The AMD chip has a higher base clock at 2068 MHz and a higher boost clock at 2416 MHz, with a game clock of 2162 MHz. The NVIDIA chip runs at 1500 MHz base and 2175 MHz boost. Despite the AMD chip's higher clocks, the NVIDIA card achieves higher overall throughput due to its vastly larger shader count and memory bandwidth. The FP32 compute figures confirm this: the RTX 4000 Ada Generation delivers 26.73 TFLOPS, while the RX 6650M XT delivers 9.896 TFLOPS. The AMD card does offer 19.79 TFLOPS in FP16 (at a 2:1 ratio), while the NVIDIA card provides 26.73 TFLOPS in FP16 (at a 1:1 ratio), meaning the NVIDIA card's FP16 performance matches its FP32 output.

FAQ

Q: Which GPU has a higher benchmark score?

A: The NVIDIA RTX 4000 Ada Generation scores 146593 in Geekbench OpenCL, compared to 76904 for the AMD Radeon RX 6650M XT, a 90.6% difference.

Q: How do these GPUs compare to their nearest rivals?

A: The RTX 4000 Ada Generation sits within 0.9% of its closest rivals (NVIDIA A10M, AMD Radeon PRO W6800, AMD Radeon Pro W6800X Duo, AMD Radeon PRO V620), while the RX 6650M XT trails its nearest competitors by 1% to 3.4%.

Q: Which GPU has more memory?

A: The NVIDIA RTX 4000 Ada Generation has 20 GB of GDDR6 memory, while the AMD Radeon RX 6650M XT has 8 GB of GDDR6 memory.

Q: Are these GPUs from the same generation?

A: No. The NVIDIA part is from the Workstation Ada generation (released August 2023), while the AMD part is from the Navi Mobile RX 6000M generation (released January 2022).

Q: What are the power requirements?

A: The RTX 4000 Ada Generation has a TDP of 130 W with a suggested 300 W power supply, while the RX 6650M XT has a TDP of 120 W and is an integrated graphics processor with no power connectors.

Q: Which GPU has a higher percentile ranking?

A: The RTX 4000 Ada Generation ranks in the 95th percentile of all GPUs, while the RX 6650M XT ranks in the 91st percentile.

Specification Differences

The two GPUs differ across nearly every measurable specification. The NVIDIA RTX 4000 Ada Generation is a single-slot desktop card measuring 245 mm in length and 112 mm in height, with a PCIe 4.0 x16 interface and a 16-pin power connector. The AMD Radeon RX 6650M XT is an integrated graphics processor (IGP) with no specified dimensions, no power connectors, and a PCIe 4.0 x8 interface. The NVIDIA card offers four DisplayPort 1.4a outputs, while the AMD card's display outputs are described as "Portable Device Dependent."

The memory configuration differs substantially. The NVIDIA card has 20 GB of GDDR6 on a 160-bit bus with 360.0 GB/s bandwidth and 2250 MHz memory clock (18 Gbps effective). The AMD card has 8 GB of GDDR6 on a 128-bit bus with 256.0 GB/s bandwidth and 2000 MHz memory clock (16 Gbps effective). The NVIDIA card also has a significantly higher transistor count (35,800 million vs 11,060 million) and higher transistor density (121.8M/mm² vs 46.7M/mm²).

Compute units scale accordingly. The RTX 4000 Ada Generation offers 6144 shading units, 192 TMUs, 64 ROPs, 48 RT cores, and 192 tensor cores. The RX 6650M XT offers 2048 shading units, 128 TMUs, 64 ROPs, and 32 RT cores, with no tensor cores. The pixel rates are close (139.2 GPixel/s for NVIDIA vs 154.6 GPixel/s for AMD), but the texture rates differ significantly (417.6 GTexel/s for NVIDIA vs 309.2 GTexel/s for AMD). The production status also differs: the NVIDIA card is listed as Active, while the AMD card is End-of-life.

Head-to-Head Benchmarks

The only recorded head-to-head benchmark is Geekbench OpenCL, and the result is one-sided. The NVIDIA RTX 4000 Ada Generation scores 146593, while the AMD Radeon RX 6650M XT scores 76904. This represents a 90.6% advantage for the NVIDIA card, meaning the RTX 4000 Ada Generation delivers nearly double the OpenCL compute performance of the RX 6650M XT.

The NVIDIA card also has additional benchmark data that the AMD card lacks. In Geekbench Vulkan, the RTX 4000 Ada Generation scores 123842, further demonstrating its compute versatility. The average benchmark score for the NVIDIA card is 135218, while the AMD card's average is 76904. This 58,314-point gap in average scores reinforces the OpenCL result.

The percentile rankings tell a similar story. The RTX 4000 Ada Generation's 95th percentile placement means it outperforms 95% of all GPUs in the database. The RX 6650M XT's 91st percentile placement, while respectable, puts it behind the NVIDIA card. The nearest rival data further contextualizes these scores. The RTX 4000 Ada Generation's closest competitor, the NVIDIA A10M, scores 135230, essentially tied with the RTX 4000 Ada Generation. The RX 6650M XT's closest rival, the NVIDIA GeForce RTX 5090 D, scores 77712, which is 1% higher than the AMD card.

Where Each One Wins

The NVIDIA RTX 4000 Ada Generation wins decisively in raw compute performance. The 90.6% OpenCL advantage and the 26.73 TFLOPS FP32 output make it the clear choice for compute-heavy workloads such as rendering, simulation, and machine learning inference. Its 20 GB memory capacity and 360.0 GB/s bandwidth provide substantial headroom for large datasets and high-resolution textures. The presence of 192 tensor cores gives it dedicated hardware for AI-accelerated tasks, a feature completely absent from the AMD card. The 95th percentile ranking and its position among workstation-class rivals like the NVIDIA A10M and AMD Radeon PRO W6800 confirm its place in the professional GPU tier.

The AMD Radeon RX 6650M XT, despite losing the compute benchmark, has specific advantages worth noting. Its higher base and boost clocks (2068 MHz and 2416 MHz respectively) indicate a design tuned for responsiveness in gaming scenarios where clock speed matters more than raw shader throughput. Its 154.6 GPixel/s pixel rate actually exceeds the NVIDIA card's 139.2 GPixel/s, suggesting better performance in fill-rate-limited scenarios. The card's 120 W TDP and IGP form factor make it suitable for mobile devices where power efficiency and compact integration are priorities. Its FP16 throughput of 19.79 TFLOPS (2:1 ratio) provides a compute boost for applications that support reduced precision.

The real distinction lies in their intended platforms. The RTX 4000 Ada Generation is a workstation card designed for sustained professional workloads, evidenced by its single-slot design, active production status, and desktop-oriented connectivity. The RX 6650M XT is a mobile part, now end-of-life, designed for laptop integration with portable-device-dependent outputs. Benchmark results indicate the NVIDIA card is the superior compute performer by a wide margin, while the AMD card's advantages are limited to specific metrics like pixel throughput and clock speed. For users requiring maximum compute performance, the RTX 4000 Ada Generation is the clear pick. For mobile gaming and power-conscious applications, the RX 6650M XT holds relevance despite its lower absolute performance.