AMD Radeon RX 6650M vs NVIDIA GeForce RTX 4090 D Comparison

The NVIDIA GeForce RTX 4090 D is a desktop flagship built on Ada Lovelace, while the AMD Radeon RX 6650M is a mobile part based on RDNA 2.0. The recorded data shows a decisive performance gap in favor of the NVIDIA card, with the RTX 4090 D winning both head-to-head benchmark tests by massive margins. However, the two products serve entirely different purposes: the RTX 4090 D targets high-end desktop workloads, while the RX 6650M fits into portable gaming systems. The benchmark results, average scores, and architectural specifications all confirm that these are not direct competitors, but the comparison still highlights how far apart their performance classes sit.

Where Each One Wins

The NVIDIA GeForce RTX 4090 D wins in every measured benchmark category. In Geekbench OpenCL, it scores 278,621 against 65,800 for the AMD Radeon RX 6650M, a margin of 323.4 percent. In Geekbench Vulkan, the NVIDIA card scores 246,941 versus 77,735, leading by 217.7 percent. These are not close contests; the RTX 4090 D dominates both compute and graphics API workloads.

The AMD Radeon RX 6650M, however, wins in the context of its intended segment. It is a mobile GPU with a 120 W TDP, an integrated form factor (IGP slot width), and no external power connectors. It consumes far less power than the RTX 4090 D, which has a 425 W TDP and requires a 1x 16-pin connector plus a suggested 800 W power supply. For thin-and-light gaming laptops, the RX 6650M is the only usable option here, as the RTX 4090 D is a triple-slot desktop card measuring 304 mm in length, 137 mm in height, and 61 mm in width. The data shows that the AMD card wins in portability and power efficiency, even though it loses every performance test.

The RTX 4090 D also wins in memory capacity and bandwidth. It has 24 GB of GDDR6X on a 384-bit bus, delivering 1.01 TB/s, while the RX 6650M has 8 GB of GDDR6 on a 128-bit bus, providing 224.0 GB/s. For tasks that require massive datasets or high-resolution textures, the NVIDIA card is clearly superior. The RX 6650M, with its smaller memory pool, is better suited for mainstream gaming at moderate settings.

Architecture Differences

The two GPUs come from different architectural generations and process nodes. The RTX 4090 D uses the AD102 chip on TSMC's 5 nm process, packing 76,300 million transistors on a 609 mm² die. The RX 6650M uses the Navi 23 chip on TSMC's 7 nm process, with 11,060 million transistors on a 237 mm² die. The transistor density of the NVIDIA chip is 125.3M per mm², compared to 46.7M per mm² for the AMD chip, reflecting the newer and denser manufacturing technology.

The RTX 4090 D has 14,592 shading units, 456 texture mapping units, and 176 raster output units. It also includes 114 ray tracing cores and 456 tensor cores, which are absent from the RX 6650M's specification sheet (the AMD card lists no tensor cores). The RX 6650M has 1,792 shading units, 112 TMUs, 64 ROPs, and 28 ray tracing cores. The NVIDIA card's compute resources are roughly eight times larger in shading units and four times larger in TMUs and ROPs.

The architectural differences extend to instruction rates. The RTX 4090 D achieves 73.54 TFLOPS in FP32 and the same 73.54 TFLOPS in FP16 (1:1 ratio). The RX 6650M delivers 8.659 TFLOPS in FP32 and 17.32 TFLOPS in FP16 (2:1 ratio). This indicates that the AMD card's FP16 throughput is double its FP32 throughput, while the NVIDIA card processes both at the same rate. The RTX 4090 D also has higher pixel and texture rates: 443.5 GPixel/s and 1,149.1 GTexel/s, versus 154.6 GPixel/s and 270.6 GTexel/s for the RX 6650M.

Memory technology differs as well. The RTX 4090 D uses GDDR6X with an effective speed of 21 Gbps, while the RX 6650M uses GDDR6 at 14 Gbps. The NVIDIA card's memory clock is 1313 MHz (21 Gbps effective), and the AMD card's is 1750 MHz (14 Gbps effective). Despite the higher clock on the AMD card, the NVIDIA card's wider bus and faster memory type deliver over four times the bandwidth.

Both cards support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, so API-level feature sets are identical. The RTX 4090 D uses PCIe 4.0 x16, while the RX 6650M uses PCIe 4.0 x8, which may slightly limit data transfer on the AMD card in some workloads. The NVIDIA card offers 1x HDMI 2.1 and 3x DisplayPort 1.4a outputs, while the RX 6650M's display outputs are described as "Portable Device Dependent," meaning they vary by laptop design.

Head-to-Head Benchmarks

The direct comparison between the two GPUs comes from two Geekbench tests. In OpenCL, the RTX 4090 D scores 278,621, and the RX 6650M scores 65,800. The delta is 323.4 percent in favor of NVIDIA. This is a massive gap, driven by the NVIDIA card's 73.54 TFLOPS FP32 throughput versus the AMD card's 8.659 TFLOPS. The OpenCL workload scales directly with raw compute throughput, so the NVIDIA card's 8.5 times higher FP32 rate translates into a 4.2 times higher benchmark score.

In Vulkan, the RTX 4090 D scores 246,941, while the RX 6650M scores 77,735. The delta is 217.7 percent. This test is less compute-bound and more dependent on graphics pipeline efficiency, but the NVIDIA card still leads by a wide margin. The RTX 4090 D's 456 TMUs and 176 ROPs, combined with its 1.01 TB/s bandwidth, allow it to handle geometry and pixel processing far faster than the RX 6650M's 112 TMUs and 64 ROPs with 224.0 GB/s bandwidth.

The RTX 4090 D wins both head-to-head tests, giving it a 2-0 record in the database's direct comparison. The RX 6650M has no wins. However, the average benchmark scores tell a similar story: the RTX 4090 D has an average score of 178,050, while the RX 6650M has an average of 71,768. The NVIDIA card sits in the 98th percentile of all GPUs, while the AMD card is in the 91st percentile. The percentile difference is smaller than the raw score difference, which indicates that the RX 6650M is still a strong performer relative to the entire GPU market, even though it is far behind this specific NVIDIA flagship.

Specification Differences

The most obvious specification differences are in size and power. The RTX 4090 D is a triple-slot card with a 425 W TDP and a 1x 16-pin power connector. The RX 6650M is an integrated part with a 120 W TDP and no power connectors. The NVIDIA card requires a suggested 800 W power supply, while the AMD card has no suggested PSU listed because it is mobile-only. The physical dimensions of the RX 6650M are not provided, as it is an IGP, while the RTX 4090 D measures 304 mm by 137 mm by 61 mm.

The memory subsystems differ substantially. The RTX 4090 D has 24 GB of GDDR6X on a 384-bit bus, achieving 1.01 TB/s bandwidth. The RX 6650M has 8 GB of GDDR6 on a 128-bit bus, achieving 224.0 GB/s. The NVIDIA card's memory is three times larger and over four times faster. The RTX 4090 D's memory clock is 1313 MHz (21 Gbps effective), while the RX 6650M's is 1750 MHz (14 Gbps effective).

Compute unit counts are also starkly different. The RTX 4090 D has 14,592 shading units, 456 TMUs, 176 ROPs, 114 RT cores, and 456 tensor cores. The RX 6650M has 1,792 shading units, 112 TMUs, 64 ROPs, and 28 RT cores, with no tensor cores listed. The NVIDIA card's FP32 performance is 73.54 TFLOPS, while the AMD card's is 8.659 TFLOPS. The FP16 rates are 73.54 TFLOPS (1:1) for NVIDIA and 17.32 TFLOPS (2:1) for AMD.

The clock speeds are somewhat close: the RTX 4090 D has a base of 2280 MHz and a boost of 2520 MHz, while the RX 6650M has a base of 2068 MHz, a boost of 2416 MHz, and a game clock of 2222 MHz. The NVIDIA card's higher clock, combined with its massive compute resources, explains the performance gap. The RX 6650M's game clock of 2222 MHz is a feature not present on the NVIDIA card, which lists only base and boost.

The bus interface also differs: the RTX 4090 D uses PCIe 4.0 x16, and the RX 6650M uses PCIe 4.0 x8. The NVIDIA card has a release date of 2023-12-27, while the AMD card was released on 2022-01-03. Both are end-of-life products. The RTX 4090 D has a launch MSRP of 1,599 USD, while the RX 6650M has no launch MSRP listed. The NVIDIA card's predecessor is the GeForce 30 series and its successor is the GeForce 50 series, while the AMD card's predecessor is Polaris Mobile and it has no successor listed.

FAQ

Q: Which GPU has higher raw compute performance?

A: The NVIDIA GeForce RTX 4090 D, with 73.54 TFLOPS FP32 and 73.54 TFLOPS FP16, versus the AMD Radeon RX 6650M's 8.659 TFLOPS FP32 and 17.32 TFLOPS FP16.

Q: How much faster is the RTX 4090 D in OpenCL?

A: It scores 278,621 against 65,800, a 323.4 percent advantage in the recorded Geekbench OpenCL test.

Q: Is the RX 6650M better for laptops?

A: Yes, it has a 120 W TDP, an IGP form factor, and no power connectors, while the RTX 4090 D is a triple-slot desktop card with a 425 W TDP.

Q: What memory capacity does each card offer?

A: The RTX 4090 D has 24 GB of GDDR6X on a 384-bit bus with 1.01 TB/s bandwidth. The RX 6650M has 8 GB of GDDR6 on a 128-bit bus with 224.0 GB/s bandwidth.

Q: Do both cards support the same DirectX version?

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

Q: Which GPU has a higher percentile ranking among all GPUs?

A: The RTX 4090 D is in the 98th percentile, while the RX 6650M is in the 91st percentile.

The Verdict

The data is unambiguous: the NVIDIA GeForce RTX 4090 D outperforms the AMD Radeon RX 6650M in every recorded benchmark by a factor of two to four times. Its average benchmark score of 178,050 is more than double the RX 6650M's 71,768, and its 98th percentile ranking places it among the top GPUs in the database. The RTX 4090 D is the clear choice for desktop users who need maximum compute throughput, large memory capacity, and the highest possible frame rates in demanding workloads.

The AMD Radeon RX 6650M, despite its lower scores, is not a failure. Its 91st percentile ranking shows it is above average in the broader GPU landscape. Its 120 W TDP, integrated form factor, and lack of power connectors make it suitable for laptops where the RTX 4090 D physically cannot fit. The RX 6650M is the only viable option here for portable systems, and its 8 GB GDDR6 memory is adequate for mainstream gaming.

In a direct head-to-head comparison, the RTX 4090 D wins 2-0. Its advantages in shading units, TMUs, ROPs, ray tracing cores, tensor cores, memory bandwidth, and process node are overwhelming. The RX 6650M's advantages are in power consumption, physical size, and portability, none of which are measured in the benchmark scores. For a desktop workstation or high-end gaming rig, the RTX 4090 D is the definitive pick. For a thin gaming laptop, the RX 6650M is the realistic choice. The decision hinges entirely on the use case, not on benchmark results, because the performance gap is so wide that no workload would favor the AMD card in raw speed.