AMD Radeon RX 6650M vs NVIDIA A100 SXM4 40 GB Comparison

Where Each One Wins

The benchmark data splits cleanly along workload type and intended environment. The NVIDIA A100 SXM4 40 GB wins both recorded head-to-head tests outright, but the AMD Radeon RX 6650M holds its own in a different performance tier entirely.

In Geekbench OpenCL, the A100 delivers a score of 201,096 against the RX 6650M's 65,800. That is a 205.6% advantage, meaning the A100 more than triples the mobile GPU's compute output in this general-purpose workload. The Vulkan test tells a similar story: 173,198 for the A100 versus 77,735 for the RX 6650M, a 122.8% lead. These are not close contests by any measure.

However, the use-case split favors each card in different contexts. The A100 is a server-class SXM module with no display outputs, designed for datacenter acceleration, AI training, and high-throughput compute. Its 98th percentile ranking among all GPUs places it in the top 2% of everything the database tracks. The RX 6650M, by contrast, is a mobile IGP-class part for laptops, ranking in the 91st percentile. That percentile still puts it ahead of roughly nine out of ten GPUs, but it occupies a fundamentally different market segment.

The RX 6650M's wins are contextual rather than absolute. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the A100 lists no API support in the database. For gaming-oriented or portable-device workloads, the AMD part has the software ecosystem advantage. The A100 simply has no display pipeline at all, so any workload requiring visual output falls to the RX 6650M by default. In raw compute, though, the A100 dominates every recorded metric.

Architecture Differences

The two GPUs come from different architectural lineages and target opposite ends of the hardware spectrum. The A100 uses the GA100 chip on NVIDIA's Ampere architecture, manufactured on TSMC's 7 nm process. It packs 54,200 million transistors across an 826 mm² die, yielding a transistor density of 65.6 million per square millimeter. The RX 6650M uses AMD's Navi 23 chip on RDNA 2.0, also on TSMC's 7 nm node, but with just 11,060 million transistors on a 237 mm² die, for 46.7 million transistors per square millimeter.

Memory configuration diverges sharply. The A100 carries 40 GB of HBM2e on a 5120-bit bus, delivering 1.56 TB/s of bandwidth. The RX 6650M has 8 GB of GDDR6 on a 128-bit bus, with 224.0 GB/s. That is a 7x difference in memory bandwidth, which explains much of the compute gap in memory-bound workloads.

Compute resources tell a similar story. The A100 has 6,912 shading units, 432 texture mapping units, 160 ROPs, and 432 tensor cores. The RX 6650M has 1,792 shading units, 112 TMUs, 64 ROPs, and 28 ray tracing cores. The A100 has no dedicated RT cores, while the RX 6650M has no tensor cores. Each card accelerates the workload type its architecture was designed for: the A100 for matrix math via tensor cores, the RX 6650M for ray tracing via its RT units.

Clock speeds invert the resource hierarchy. The RX 6650M runs at a base of 2068 MHz and boosts to 2416 MHz, with a game clock of 2222 MHz. The A100 sits at 1095 MHz base and 1410 MHz boost. Higher clocks on the AMD part partially compensate for fewer cores, but not nearly enough to close the compute gap. The A100's FP32 throughput is 19.49 TFLOPS against 8.659 TFLOPS for the RX 6650M. In FP16, the A100 reaches 77.97 TFLOPS with a 4:1 ratio, while the RX 6650M manages 17.32 TFLOPS at 2:1.

Power envelopes differ drastically. The A100 carries a 400 W TDP and requires an 800 W suggested PSU, while the RX 6650M draws 120 W with no PSU recommendation listed. The A100 is an SXM module with no power connectors, meaning it relies on the host system's backplane. The RX 6650M is an IGP, integrated into a mobile platform.

The A100's pixel rate is 225.6 GPixel/s and texture rate is 609.1 GTexel/s. The RX 6650M posts 154.6 GPixel/s and 270.6 GTexel/s. Even in rasterization throughput, the A100 leads despite its lower clocks, thanks to far more ROPs and TMUs.

Head-to-Head Benchmarks

The Geekbench OpenCL result is the largest single gap between these two cards. The A100 scores 201,096, the RX 6650M scores 65,800. The delta of 205.6% means the A100 delivers roughly three times the compute performance. This test exercises general GPU compute across a range of workloads, and the A100's combination of 6,912 shaders, 432 tensor cores, and 1.56 TB/s of memory bandwidth simply overwhelms the mobile part.

The Vulkan test narrows the gap slightly but still shows a decisive A100 victory. The A100 scores 173,198 against 77,735 for the RX 6650M, a 122.8% difference. Vulkan is a lower-level API that can expose efficiency differences, and the RX 6650M's RDNA 2.0 architecture with its higher clocks closes some of the distance. Yet the A100 still finishes more than twice as fast in absolute terms.

Contextualizing these scores against nearest rivals clarifies the competitive positioning. The A100's average benchmark score is 187,147, placing it 1.3% ahead of the NVIDIA RTX 5000 Ada Generation (184,664), 1.9% ahead of the A100 SXM4 80 GB (183,725), and 2.8% ahead of the RTX PRO 5000 Blackwell (182,109). The Tesla V100S PCIe 32 GB sits 3.7% higher at 194,415, but that is the only nearby card that beats the A100 on average.

The RX 6650M's average score is 71,768. It trails the NVIDIA TITAN X Pascal by 0.5% (72,098) and the AMD Radeon Pro Vega 64 by 0.8% (72,379), while leading the Radeon RX 6600 LE by 1.3% (70,829) and the Radeon Vega Frontier Edition by 2.2% (73,370). These are tight spreads, indicating the RX 6650M sits in a crowded mid-range band where small percentage differences separate cards.

The percentile data reinforces the tier separation. The A100's 98th percentile means it outperforms 98% of all GPUs in the database. The RX 6650M's 91st percentile, while respectable, puts it seven percentage points lower. In practical terms, the A100 competes with datacenter accelerators and top-tier workstation cards, while the RX 6650M competes with older flagship gaming cards and professional mobile GPUs.

The Verdict

The data supports a clear segmentation rather than a direct competition. The NVIDIA A100 SXM4 40 GB is a datacenter compute accelerator with no display outputs, designed for maximum throughput in AI, scientific computing, and high-performance workloads. It wins both recorded benchmarks by margins of 205.6% and 122.8%, and its 98th percentile ranking places it among the fastest GPUs ever tracked.

The AMD Radeon RX 6650M is a mobile GPU for laptops, trading raw compute for power efficiency and feature completeness. Its 120 W TDP against the A100's 400 W means it can operate in thermal envelopes the A100 cannot approach. It supports modern graphics APIs, has ray tracing cores, and includes display outputs that are portable-device dependent.

For users needing maximum compute density in a server environment, the A100 is the unambiguous choice. Its tensor cores accelerate matrix operations that the RX 6650M cannot perform at all. For users needing a capable mobile GPU with modern API support, the RX 6650M is the only viable option of the two, since the A100 cannot output to a display.

Neither card is a substitute for the other. The A100 wins every raw performance metric, but the RX 6650M wins on portability, API coverage, and feature set. The average benchmark scores, 187,147 versus 71,768, tell the performance story, while the architecture and form factor differences tell the usability story. Both are end-of-life products, but they served completely different markets.

FAQ

Q: Which GPU has higher raw compute performance?

A: The NVIDIA A100 SXM4 40 GB. It delivers 19.49 TFLOPS FP32 and 77.97 TFLOPS FP16, compared to 8.659 TFLOPS FP32 and 17.32 TFLOPS FP16 for the AMD Radeon RX 6650M.

Q: How large is the memory bandwidth difference?

A: The A100 has 1.56 TB/s of bandwidth from 40 GB of HBM2e on a 5120-bit bus. The RX 6650M has 224.0 GB/s from 8 GB of GDDR6 on a 128-bit bus, a roughly 7x gap in favor of the A100.

Q: Does either GPU support ray tracing?

A: Only the AMD Radeon RX 6650M has dedicated ray tracing cores, with 28 RT units. The NVIDIA A100 lists no RT cores in the database.

Q: Which GPU ranks higher among all GPUs?

A: The A100 sits in the 98th percentile, while the RX 6650M sits in the 91st percentile. The A100 also has a much higher average benchmark score at 187,147 versus 71,768.

Q: Can the A100 be used in a laptop?

A: No. The A100 is an SXM module with a 400 W TDP and no display outputs. The RX 6650M is an IGP with a 120 W TDP designed for mobile platforms.

Q: How does each card compare to its nearest rivals?

A: The A100 is 1.3% ahead of the RTX 5000 Ada Generation and 1.9% ahead of the A100 SXM4 80 GB, while trailing the Tesla V100S PCIe 32 GB by 3.7%. The RX 6650M trails the TITAN X Pascal by 0.5% and the Radeon Pro Vega 64 by 0.8%, while leading the RX 6600 LE by 1.3%.