AMD Radeon RX 6650M XT vs NVIDIA A100 PCIe 80 GB Comparison

Head-to-Head Benchmarks

The sole recorded benchmark in the database, Geekbench OpenCL, delivers a decisive result. The NVIDIA A100 PCIe 80 GB scores 207,124 points, while the AMD Radeon RX 6650M XT scores 76,904 points. This produces a delta of 169.3% in favor of the NVIDIA part. In practical terms, the A100 more than doubles the OpenCL throughput of the RX 6650M XT, a margin that dwarfs the differences typically seen between successive generations within a single product family.

Contextualizing the A100's score against its nearest rivals reinforces its standing. The A100 sits 5.7% above the NVIDIA RTX 6000D, which records an average score of 195,964. It also leads the NVIDIA Tesla V100S PCIe 32 GB by 6.5%, with that card averaging 194,415. However, the A100 trails the AMD Radeon PRO W7900D by 5.8%, as that GPU reaches 219,827, and it sits 8% behind the NVIDIA PG506-232, which posts 225,124. The pattern is clear: within the A100's immediate competitive set, the score differences are single-digit percentages, marking the A100 as a high-end compute part that is closely matched by its direct peers. Its 99th percentile ranking among all GPUs in the database confirms its placement near the very top of the performance distribution.

For the RX 6650M XT, the rival comparison tells a different story. Its score of 76,904 places it just 1% below the NVIDIA GeForce RTX 5090 D, which averages 77,712. It is 2.6% behind the AMD Radeon RX 6850M XT at 78,940, and 3.1% and 3.4% behind the NVIDIA Tesla P100 PCIe 12 GB and 16 GB variants, which score 79,396 and 79,605 respectively. The close grouping of these four rivals, all within a 3.4% window, indicates that the RX 6650M XT is a mid-pack performer among its peers, competitive but not dominant. Its 91st percentile ranking places it well above the median GPU, yet far below the A100's near-top placement. The head-to-head delta of 169.3% is the single most important number in this comparison; it quantifies a performance gap that is roughly an order of magnitude larger than the gaps observed within each product's own rival cluster.

FAQ

Q: Which GPU has the higher Geekbench OpenCL score?

A: The NVIDIA A100 PCIe 80 GB records 207,124 points, which is 169.3% higher than the AMD Radeon RX 6650M XT's 76,904 points.

Q: How does the A100 compare to its closest rivals?

A: The A100 outperforms the NVIDIA RTX 6000D by 5.7% and the NVIDIA Tesla V100S PCIe 32 GB by 6.5%, but it trails the AMD Radeon PRO W7900D by 5.8% and the NVIDIA PG506-232 by 8%.

Q: Where does the RX 6650M XT stand relative to its competition?

A: The RX 6650M XT is 1% behind the NVIDIA GeForce RTX 5090 D, 2.6% behind the AMD Radeon RX 6850M XT, 3.1% behind the NVIDIA Tesla P100 PCIe 12 GB, and 3.4% behind the NVIDIA Tesla P100 PCIe 16 GB.

Q: What do the percentile rankings indicate for these two GPUs?

A: The A100 sits in the 99th percentile of all GPUs in the database, while the RX 6650M XT is in the 91st percentile. This reflects the A100's near-elite status and the RX 6650M XT's solid but less elevated position.

Q: Which GPU has the larger memory bus width?

A: The A100 uses a 5120-bit bus with HBM2e memory, whereas the RX 6650M XT uses a 128-bit bus with GDDR6 memory.

Q: Are both GPUs still in production?

A: No. Both the NVIDIA A100 PCIe 80 GB and the AMD Radeon RX 6650M XT are listed as end-of-life products in the database.

The Verdict

The data supports a straightforward selection for compute-heavy workloads. The NVIDIA A100 PCIe 80 GB is the clear choice when raw OpenCL throughput is the priority. Its 207,124 score versus 76,904 for the RX 6650M XT, a 169.3% advantage, is not a marginal edge; it is a fundamental performance class difference. The A100 also carries the stronger pedigree among its peers, leading two of its four nearest rivals and sitting within 8% of the top scorer in its group. For any application that scales with FP32, FP16, or memory bandwidth, the A100's recorded specifications, including 19.49 TFLOPS FP32, 77.97 TFLOPS FP16, and 1.94 TB/s of memory bandwidth, make it the only rational option between these two.

The AMD Radeon RX 6650M XT, by contrast, is a mobile-class part with 9.896 TFLOPS FP32 and 19.79 TFLOPS FP16. Its 91st percentile ranking shows it is a capable GPU, but its rival set is tightly packed: the spread from the RTX 5090 D to the Tesla P100 16 GB is just 2.4 percentage points. This indicates that the RX 6650M XT is not a standout even within its own tier. It would be the appropriate pick only in scenarios where the A100's physical footprint or power draw is disqualifying. The A100 is a dual-slot card with a 300 W TDP and an 8-pin EPS connector, while the RX 6650M XT is an IGP with a 120 W TDP and no power connectors. For a portable or low-power deployment, the RX 6650M XT is the viable alternative, but the benchmark data shows no performance justification for choosing it over the A100.

Specification Differences

The two GPUs diverge in nearly every measurable specification. Memory capacity differs sharply: the A100 offers 80 GB of HBM2e across a 5120-bit bus, delivering 1.94 TB/s of bandwidth, whereas the RX 6650M XT provides 8 GB of GDDR6 on a 128-bit bus with 256.0 GB/s. Clock behavior also contrasts. The A100 runs at a 1065 MHz base and 1410 MHz boost, while the RX 6650M XT operates at a 2068 MHz base, 2162 MHz game clock, and 2416 MHz boost. Effective memory speed is 3 Gbps for the A100 versus 16 Gbps for the RX 6650M XT, though the A100's far wider bus overwhelms the RX 6650M XT's faster per-pin rate.

Compute resources follow the same pattern. The A100 packs 6912 shading units, 432 TMUs, 160 ROPs, and 432 tensor cores, with no dedicated RT cores listed. The RX 6650M XT has 2048 shading units, 128 TMUs, 64 ROPs, and 32 ray accelerators, but no tensor cores. Pixel and texture rates reflect these counts: the A100 achieves 225.6 GPixel/s and 609.1 GTexel/s, versus 154.6 GPixel/s and 309.2 GTexel/s for the RX 6650M XT. Power and physical design are equally distinct. The A100 is rated at 300 W TDP, requires an 8-pin EPS connector, suggests a 700 W power supply, and is dual-slot with dimensions of 267 mm by 111 mm. The RX 6650M XT is an IGP with a 120 W TDP, no power connectors, no suggested PSU rating, and no listed dimensions. Bus interface differs as well: PCIe 4.0 x16 for the A100 versus PCIe 4.0 x8 for the RX 6650M XT. Display outputs are absent on the A100, while the RX 6650M XT's outputs are listed as portable device dependent.

Architecture Differences

The architectural split is fundamental. The NVIDIA A100 PCIe 80 GB is built on the GA100 chip using the Ampere architecture, belongs to the Server Ampere generation, and was released in 2021. The AMD Radeon RX 6650M XT uses the Navi 23 chip with the RDNA 2.0 architecture, is part of the Navi Mobile generation, and launched in 2022. Both are fabricated on a 7 nm process at TSMC, but the die characteristics differ enormously. The A100's GA100 die measures 826 mm² and contains 54,200 million transistors, yielding a density of 65.6 million transistors per mm². The RX 6650M XT's Navi 23 die is 237 mm² with 11,060 million transistors, for a density of 46.7 million per mm². The A100 therefore packs nearly five times the transistor count on a die that is roughly 3.5 times larger.

Feature sets also diverge. The A100 includes 432 tensor cores, aligning it with NVIDIA's deep learning and matrix math focus, and its FP16 throughput of 77.97 TFLOPS is delivered at a 4:1 ratio relative to FP32. The RX 6650M XT has no tensor cores, instead carrying 32 ray tracing cores, and its FP16 rate of 19.79 TFLOPS is at a 2:1 ratio. API support is present only on the AMD side in the database, listing DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The A100's API entries are null, reflecting its server-oriented role with no display or graphics API focus. The A100's predecessor is Tesla Turing and its successor is Server Ada, while the RX 6650M XT's predecessor is Polaris Mobile and it has no listed successor. Production status for both is end-of-life. The memory technology alone tells the story: HBM2e with a 5120-bit interface versus GDDR6 with a 128-bit interface. These are not incremental changes; they represent two entirely different design philosophies, one aimed at maximum compute throughput and memory bandwidth, the other at mobile efficiency and graphics features. The benchmark results are the natural consequence of that architectural divide.