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

# Head-to-Head Benchmarks

The recorded data contains a single direct comparison between the NVIDIA A100 SXM4 40 GB and the AMD Radeon RX 6650M XT, and the result is decisively lopsided. In the Geekbench OpenCL test, the A100 SXM4 40 GB scores 201,096 points against the RX 6650M XT's 76,904 points. That translates to a delta of 161.5%, meaning the NVIDIA accelerator delivers more than two and a half times the raw compute throughput of the AMD mobile GPU in this workload. The A100 takes the only head-to-head win, with a 1-0 record in the database.

Context from the nearest rival lists reinforces how different these two parts are in their respective tiers. The A100 SXM4 40 GB sits at the 98th percentile of all GPUs tracked, with an average benchmark score of 187,147 across its two recorded tests (OpenCL and Vulkan). Its closest competitors are all high-end data center or workstation parts: the NVIDIA RTX 5000 Ada Generation trails by just 1.3% at 184,664, the A100 SXM4 80 GB is 1.9% behind at 183,725, and the RTX PRO 5000 Blackwell is 2.8% back at 182,109. Interestingly, the only rival that beats it is the older Tesla V100S PCIe 32 GB, which posts 194,415 and leads by 3.7%. This suggests the A100 40 GB is operating at the very top of the performance hierarchy, where even small percentage swings separate the leading accelerators.

The RX 6650M XT, by contrast, sits at the 91st percentile, a respectable position but clearly a step down. Its average benchmark score of 76,904 comes from a single OpenCL result, and its nearest rivals are a mix of desktop and mobile parts. The GeForce RTX 5090 D is essentially tied, trailing by only 1% at 77,712. The RX 6850M XT, a higher-tier sibling in the same mobile family, leads by 2.6% at 78,940. Two Tesla P100 variants, the 12 GB and 16 GB versions, also outpace it by 3.1% and 3.4%, respectively, at 79,396 and 79,605. The picture here is of a capable mid-range mobile GPU that is competitive with its immediate peers but nowhere near the A100's league.

The gap between the two parts in raw benchmark terms is not subtle. The A100's OpenCL result is roughly 2.6 times higher than the RX 6650M XT's, and the percentile difference (98 versus 91) places them in entirely different performance strata. When the database computes an average score, the A100's 187,147 dwarfs the RX 6650M XT's 76,904 by a factor of about 2.4. These are not comparable products in any workload sense; the benchmark numbers simply confirm what the hardware specifications already imply.

FAQ

Q: Which GPU wins the only recorded head-to-head benchmark?

A: The NVIDIA A100 SXM4 40 GB wins the Geekbench OpenCL test with a score of 201,096 against the AMD Radeon RX 6650M XT's 76,904, a delta of 161.5%.

Q: How does the A100 SXM4 40 GB compare to its closest rivals in the database?

A: The A100's average benchmark score is 187,147. It leads the RTX 5000 Ada Generation (184,664) by 1.3%, the A100 SXM4 80 GB (183,725) by 1.9%, and the RTX PRO 5000 Blackwell (182,109) by 2.8%. Only the Tesla V100S PCIe 32 GB (194,415) beats it, by 3.7%.

Q: What is the RX 6650M XT's standing among its nearest competitors?

A: The RX 6650M XT has an average score of 76,904. It trails the RTX 5090 D (77,712) by 1%, the RX 6850M XT (78,940) by 2.6%, the Tesla P100 PCIe 12 GB (79,396) by 3.1%, and the Tesla P100 PCIe 16 GB (79,605) by 3.4%.

Q: Which GPU has the higher percentile ranking across all tracked GPUs?

A: The NVIDIA A100 SXM4 40 GB ranks at the 98th percentile, while the AMD Radeon RX 6650M XT ranks at the 91st percentile.

Q: Does the RX 6650M XT have any benchmark win over the A100?

A: No. The database records zero wins for the RX 6650M XT in head-to-head testing; the A100 holds a 1-0 advantage.

Q: How many benchmark entries does each GPU have in the database?

A: The A100 SXM4 40 GB has two recorded benchmark scores (Geekbench OpenCL at 201,096 and Geekbench Vulkan at 173,198). The RX 6650M XT has one recorded score (Geekbench OpenCL at 76,904).

Architecture Differences

The fundamental architectural split here is between NVIDIA's Ampere design for data center compute and AMD's RDNA 2.0 for mobile graphics. The A100 uses the GA100 chip, built on a 7 nm process at TSMC with 54,200 million transistors on an 826 mm² die. That yields a transistor density of 65.6 million per square millimeter. The RX 6650M XT uses the Navi 23 chip, also on TSMC's 7 nm node, but with just 11,060 million transistors on a 237 mm² die, for a density of 46.7 million per square millimeter. The A100 packs nearly five times the transistor count and more than three times the die area, reflecting its role as a massive compute accelerator rather than a compact mobile part.

The compute resources diverge sharply. The A100 has 6,912 shading units, 432 texture mapping units, and 160 raster output units. It also includes 432 tensor cores, which are dedicated to AI and deep learning workloads. The RX 6650M XT has 2,048 shading units, 128 TMUs, and 64 ROPs, plus 32 ray tracing cores but no tensor cores. The ray tracing hardware on the AMD part is absent from the A100, which lists no RT cores, meaning the two GPUs are optimized for entirely different task profiles: the A100 for tensor-heavy server work, the RX 6650M XT for real-time graphics with ray tracing.

Clock behavior reflects their different design philosophies. The A100 runs at a base clock of 1095 MHz and boosts to 1410 MHz, while the RX 6650M XT starts at 2068 MHz base and reaches 2416 MHz boost, with a game clock of 2162 MHz. The AMD part's higher clocks are typical of a graphics-oriented GPU chasing frame rates, whereas the A100's lower clocks prioritize sustained throughput and power efficiency under massive parallel loads. The A100's memory clock is listed at 1215 MHz with 2.4 Gbps effective, while the RX 6650M XT runs its memory at 2000 MHz with 16 Gbps effective, another sign of the mobile part's focus on bandwidth-per-watt for gaming.

Architectural feature sets also differ. The RX 6650M XT supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, making it a full-featured consumer graphics API stack. The A100 lists no DirectX, OpenGL, or Vulkan support in the database, underscoring its purpose as a compute-only accelerator with no display outputs. The A100 is built for server racks, not gaming rigs, and its API support is irrelevant to its intended workloads.

Specification Differences

Memory configuration is one of the most striking differences. The A100 SXM4 40 GB comes with 40 GB of HBM2e memory on a 5120-bit bus, delivering 1.56 TB/s of bandwidth. The RX 6650M XT has 8 GB of GDDR6 on a 128-bit bus, with 256.0 GB/s of bandwidth. The A100 offers five times the capacity and roughly six times the bandwidth, a gap that dominates any memory-bound workload.

Compute throughput numbers follow the same pattern. The A100's FP32 performance is 19.49 TFLOPS, while the RX 6650M XT manages 9.896 TFLOPS. In FP16, the A100 reaches 77.97 TFLOPS (with a 4:1 ratio), and the RX 6650M XT hits 19.79 TFLOPS (with a 2:1 ratio). The A100's FP16 advantage is nearly fourfold. Pixel and texture rates also favor the A100: 225.6 GPixel/s and 609.1 GTexel/s against 154.6 GPixel/s and 309.2 GTexel/s for the AMD part.

Power and physical specifications could not be more different. The A100 has a TDP of 400 W, requires an 800 W suggested PSU, and comes as an SXM Module with no power connectors and no display outputs. The RX 6650M XT has a TDP of 120 W, is classified as an IGP (integrated graphics package for mobile), also has no power connectors, and lists its display outputs as "Portable Device Dependent." The A100 uses a PCIe 4.0 x16 interface, while the RX 6650M XT uses PCIe 4.0 x8. The A100 has no API listings, while the RX 6650M XT supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Release timing and lineage also differ. The A100 was released on May 13, 2020, with a predecessor of Tesla Turing and a successor of Server Ada. The RX 6650M XT came out on January 3, 2022, succeeding Polaris Mobile with no listed successor. Both are end-of-life products, but the A100 is a server accelerator from 2020 that remained relevant at the top of the charts, while the RX 6650M XT is a mobile GPU from 2022 that occupied a mid-range niche. Neither has a recorded launch MSRP in the database.

The Verdict

The data points to an unambiguous conclusion: these two GPUs serve entirely different markets, and no benchmark result suggests otherwise. The NVIDIA A100 SXM4 40 GB is a data center compute accelerator built for massive parallel workloads, with 40 GB of HBM2e, 432 tensor cores, and FP32 throughput of 19.49 TFLOPS. It holds a 161.5% lead over the RX 6650M XT in the only shared test, ranks at the 98th percentile of all GPUs, and sits within a few percentage points of the fastest accelerators in the database, including the 80 GB version of itself and the RTX 5000 Ada Generation.

The AMD Radeon RX 6650M XT is a mobile graphics part with 8 GB of GDDR6, 32 ray tracing cores, and support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. Its 91st percentile ranking and average score of 76,904 place it in the upper-middle tier of the GPU landscape, competitive with desktop parts like the RTX 5090 D and the Tesla P100 series. It is not a compute monster, but it was never designed to be one.

Who should pick which? Anyone needing raw compute for AI, scientific simulation, or high-bandwidth data processing should select the A100 SXM4 40 GB. Its memory bandwidth of 1.56 TB/s, tensor core count, and near-top percentile performance make it the obvious choice for server workloads. Anyone needing a mobile GPU for gaming or portable graphics should choose the RX 6650M XT, as it is the only one of the two with display outputs, ray tracing cores, and consumer API support. The A100 has no display outputs and no DirectX or Vulkan support, making it useless for interactive graphics.

The benchmark gap is real and massive, but it is also irrelevant to most buyers because the products do not compete. The A100 wins every measurable compute test, and the RX 6650M XT wins the only category that matters for its use case: it can actually output to a screen. The database records one head-to-head result, and it goes to NVIDIA, but the verdict for a purchasing decision depends entirely on the target application. For a server rack, the A100 is the only viable option. For a laptop, the RX 6650M XT is the only viable option. The data does not support any crossover.