AMD Radeon RX 6650M XT vs NVIDIA RTX A4500 Comparison

# NVIDIA RTX A4500 vs AMD Radeon RX 6650M XT

The NVIDIA RTX A4500 and AMD Radeon RX 6650M XT occupy different corners of the GPU landscape, with the former as a desktop workstation card and the latter as a mobile part. The benchmark data shows a decisive overall winner: the RTX A4500 averages 91,671 across all tests, while the RX 6650M XT averages 76,904 — a difference of roughly 19.2%. The A4500 also sits at the 93rd percentile among all GPUs, versus the 91st percentile for the RX 6650M XT. Despite the RX 6650M XT being a newer release (January 2022 versus November 2021), the A4500’s larger die, wider memory bus, and higher power envelope deliver substantially more compute throughput in the one benchmark where both were measured.

The Verdict

The data points to a clear choice depending on workload and form factor. The NVIDIA RTX A4500 is the performance leader by a wide margin in the single shared benchmark, Geekbench OpenCL, scoring 141,837 against 76,904 for the AMD Radeon RX 6650M XT — an 84.4% advantage. This is not a marginal gap; it is a near-doubling of raw compute throughput. For professionals running OpenCL-accelerated applications — rendering, simulation, or data processing — the A4500 is the only rational pick based on the numbers.

The RX 6650M XT, however, is a mobile part with a 120 W TDP and no power connectors, designed for integration into laptops. Its transistor density is actually higher than the A4500’s (46.7M per mm² versus 45.1M per mm²), reflecting a more modern 7 nm process from TSMC versus the A4500’s 8 nm Samsung node. But density does not translate to throughput here; the A4500’s 28,300 million transistors on a 628 mm² die dwarf the RX 6650M XT’s 11,060 million transistors on 237 mm². If the requirement is maximum performance per watt in a portable chassis, the RX 6650M XT’s 120 W envelope is compelling, but the data shows it trails the A4500 by 84.4% in OpenCL. There is no benchmark in the head-to-head where the RX 6650M XT wins — winsA is 1, winsB is 0.

For buyers who need PCIe 4.0 x16 bandwidth, 20 GB of memory, and 640 GB/s of bandwidth, the A4500 is the answer. For those constrained to a laptop form factor with an IGP-class slot and 8 GB of memory, the RX 6650M XT is the only option that fits — but its performance ceiling is far lower.

Architecture Differences

The two GPUs could not be more different in design philosophy. The A4500 uses NVIDIA’s Ampere architecture on a GA102 chip, fabricated by Samsung on an 8 nm process. The die measures 628 mm² and houses 28,300 million transistors. The RX 6650M XT uses AMD’s RDNA 2.0 architecture on the Navi 23 chip, built by TSMC on a 7 nm process, with a die size of 237 mm² and 11,060 million transistors. The transistor density is nearly identical (45.1M vs 46.7M per mm²), but the A4500’s much larger physical die allows for far more compute resources.

Shader throughput tells the story. The A4500 has 7,168 shading units, 224 texture mapping units, and 96 ROPs, along with 56 RT cores and 224 tensor cores. The RX 6650M XT has 2,048 shading units, 128 TMUs, 64 ROPs, and 32 RT cores — and no tensor cores at all. This is a fundamental architectural split: the A4500 is built for workstation compute with dedicated tensor acceleration, while the RX 6650M XT is a gaming-oriented mobile GPU with no tensor hardware.

The memory subsystems diverge sharply. The A4500 features 20 GB of GDDR6 on a 320-bit bus, yielding 640 GB/s of bandwidth. The RX 6650M XT has 8 GB of GDDR6 on a 128-bit bus, for 256 GB/s. That is a 2.5x difference in both capacity and bandwidth. The A4500’s pixel rate is 158.4 GPixel/s versus 154.6 GPixel/s for the RX 6650M XT, but the texture rate gap is larger: 369.6 GTexel/s versus 309.2 GTexel/s. FP32 performance is 23.65 TFLOPS for the A4500 versus 9.896 TFLOPS for the RX 6650M XT — a 139% advantage. In FP16, the A4500 delivers 23.65 TFLOPS at a 1:1 ratio, while the RX 6650M XT achieves 19.79 TFLOPS at a 2:1 ratio, meaning the AMD part’s FP16 is shader-based with half-rate throughput.

FAQ

Q: Which GPU has more memory bandwidth?

A: The NVIDIA RTX A4500 has 640.0 GB/s of bandwidth from its 320-bit bus, while the AMD Radeon RX 6650M XT has 256.0 GB/s from a 128-bit bus. The A4500 leads by 2.5x.

Q: How do the two compare in raw FP32 compute?

A: The A4500 produces 23.65 TFLOPS of FP32, versus 9.896 TFLOPS for the RX 6650M XT. This represents a 139% performance advantage for the NVIDIA card.

Q: Are both GPUs DirectX 12 Ultimate compatible?

A: Yes, both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The API feature sets are identical.

Q: Which GPU has a higher transistor density?

A: The AMD Radeon RX 6650M XT has a higher density at 46.7M transistors per mm², compared to 45.1M for the NVIDIA RTX A4500, despite the A4500 having 2.5x more total transistors.

Q: What is the power draw difference?

A: The RTX A4500 is rated at 200 W TDP and requires a single 8-pin power connector, while the RX 6650M XT is rated at 120 W TDP with no power connectors, as it is designed for mobile integration.

Q: Which GPU has more RT cores?

A: The NVIDIA RTX A4500 has 56 RT cores, while the AMD Radeon RX 6650M XT has 32 RT cores. The A4500 also adds 224 tensor cores, which the RX 6650M XT lacks entirely.

Specification Differences

The two cards differ on nearly every specification that matters. The A4500 uses an 8 nm Samsung process; the RX 6650M XT uses 7 nm TSMC. The A4500’s die is 628 mm² versus 237 mm², with transistor counts of 28,300 million versus 11,060 million. Base clocks are 1050 MHz for the A4500 and 2068 MHz for the RX 6650M XT, with boost clocks of 1650 MHz and 2416 MHz respectively. The AMD part has a game clock of 2162 MHz; the NVIDIA card has none listed. Memory clocks are identical at 2000 MHz (16 Gbps effective), but capacities and bus widths differ: 20 GB on 320-bit versus 8 GB on 128-bit.

Shading units number 7,168 versus 2,048; TMUs are 224 versus 128; ROPs are 96 versus 64. The A4500 has 56 RT cores and 224 tensor cores; the RX 6650M XT has 32 RT cores and no tensor cores. Pixel rate is 158.4 GPixel/s versus 154.6 GPixel/s, texture rate is 369.6 GTexel/s versus 309.2 GTexel/s. FP32 is 23.65 TFLOPS versus 9.896 TFLOPS; FP16 is 23.65 TFLOPS (1:1) versus 19.79 TFLOPS (2:1). TDP is 200 W versus 120 W. The A4500 is dual-slot with a 1x 8-pin connector and 550 W suggested PSU; the RX 6650M XT is IGP-class with no connectors. Bus interface is PCIe 4.0 x16 versus x8. Display outputs are 4x DisplayPort 1.4a versus "Portable Device Dependent." The A4500 measures 267 mm x 112 mm; the AMD part has no listed dimensions.

Head-to-Head Benchmarks

The only shared benchmark in the data is Geekbench OpenCL. The NVIDIA RTX A4500 scores 141,837, while the AMD Radeon RX 6650M XT scores 76,904. That is a delta of 84.4% in favor of the A4500 — the largest single-benchmark gap possible in this comparison, given it is the only head-to-head result. To put that in context, the A4500’s nearest rival, the NVIDIA RTX A4500 Mobile, scores 91,134, just 0.6% behind. The AMD Radeon Instinct MI60 scores 92,466, which is 0.9% ahead of the A4500. The Quadro GP100 and Radeon PRO W7600 trail by 4.8% and 5.2% respectively.

For the RX 6650M XT, the nearest rival is the NVIDIA GeForce RTX 5090 D at 77,712, which is 1% behind the AMD card. The RX 6850M XT scores 78,940, 2.6% ahead, and the Tesla P100 variants (PCIe 12 GB and 16 GB) score 79,396 and 79,605, which are 3.1% and 3.4% ahead. This places the RX 6650M XT in a tight cluster of mobile and datacenter parts around the 77,000–80,000 score range, while the A4500 sits in a different tier entirely, near 92,000.

The Geekbench Vulkan result for the A4500 is 129,980, which is not directly comparable to the RX 6650M XT since no Vulkan benchmark exists for the AMD part. The A4500 also has a 3DMark Steel Nomad DX12 score of 3,196, again with no counterpart for the RX 6650M XT. The single head-to-head result is decisive: the A4500 wins by 84.4%, and no other data contradicts that margin. The winsA count is 1, the winsB count is 0.