AMD Radeon RX 6500 XT vs NVIDIA Tesla K20Xm Comparison

The data compares two graphics cards from different eras and market segments: the NVIDIA Tesla K20Xm, a 2012 compute-oriented accelerator, and the AMD Radeon RX 6500 XT, a 2022 consumer GPU. Their average benchmark scores are close, but the underlying architectures and intended workloads are fundamentally distinct. The K20Xm holds an average benchmark score of 12625, placing it in the 52nd percentile of all GPUs, while the RX 6500 XT averages 11842, sitting in the 51st percentile. This near-parity in overall score masks a significant divergence in performance characteristics, which this analysis will break down.

Where Each One Wins

The benchmark data is unambiguous about the single head-to-head test available: the AMD Radeon RX 6500 XT wins the only direct comparison. In the Geekbench OpenCL test, the RX 6500 XT scores 48289, which is a 64.4% improvement over the Tesla K20Xm's 17215. This is a decisive victory for AMD in raw compute throughput as measured by that specific test.

However, the story is more nuanced when looking at the entire benchmark suite. The Tesla K20Xm only has two benchmark entries: Geekbench Metal (8035) and Geekbench OpenCL (17215). Its average of 12625 is actually higher than the RX 6500 XT's average of 11842, despite losing the head-to-head OpenCL test. This suggests the K20Xm performs relatively better in the Metal API test, though we lack a direct comparison for that metric.

The RX 6500 XT, by contrast, has a much broader benchmark profile, including DirectX tests (Passmark DX9, DX10, DX11, DX12), compute tests (Passmark GPU Compute), and general 2D/3D tests (Passmark G2D and G3D). Its strengths appear to lie in these diverse workloads, particularly in the Passmark G3D score of 9608, which likely reflects its gaming-oriented design. The K20Xm, with no display outputs, is clearly not designed for such tasks.

Architecture Differences

The architectural divide between these two GPUs is substantial. The NVIDIA Tesla K20Xm is built on the Kepler architecture (chip GK110) using a 28 nm process at TSMC. It packs 7,080 million transistors on a 561 mm² die, yielding a transistor density of 12.6M / mm². This is a massive, power-hungry chip designed for professional compute, with a TDP of 235 W and a suggested power supply of 550 W.

In contrast, the AMD Radeon RX 6500 XT uses the RDNA 2.0 architecture (chip Navi 24) on a much more modern 6 nm process, also from TSMC. It contains 5,400 million transistors on a tiny 107 mm² die, achieving a transistor density of 50.5M / mm². This is over four times the density of the K20Xm, reflecting the massive process node advantage. The RX 6500 XT is far more efficient, with a TDP of just 107 W and a suggested power supply of 300 W.

The memory subsystems are also radically different. The K20Xm features 6 GB of GDDR5 on a 384-bit bus, delivering 249.6 GB/s of bandwidth. The RX 6500 XT has only 4 GB of GDDR6 on a 64-bit bus, providing 143.9 GB/s. While the K20Xm has a clear bandwidth advantage, the RX 6500 XT compensates with much higher clock speeds: its base clock is 2310 MHz, with a boost of 2815 MHz, compared to the K20Xm's memory clock of 1300 MHz (5.2 Gbps effective), with no base or boost clocks listed for the GPU core itself.

Feature sets also diverge sharply. The RX 6500 XT includes 16 ray tracing cores and supports DirectX 12 Ultimate (12_2), while the K20Xm is limited to DirectX 12 (11_0) and has no ray tracing hardware. The AMD card also offers modern display outputs (1x HDMI 2.1 and 1x DisplayPort 1.4a), while the Tesla has no display outputs at all, confirming its compute-only role.

Head-to-Head Benchmarks

The only direct benchmark comparison available is Geekbench OpenCL, and the results are lopsided. The AMD Radeon RX 6500 XT scores 48289, while the NVIDIA Tesla K20Xm scores 17215. This represents a 64.4% advantage for the AMD card. This is a massive margin, indicating that in this particular compute workload, the newer architecture and higher clock speeds of the RX 6500 XT completely overwhelm the older, albeit larger, Kepler chip.

It is importantly the K20Xm's other benchmark, Geekbench Metal, scores 8035. While there is no direct RX 6500 XT Metal score to compare, this figure contributes to the K20Xm's higher average benchmark score of 12625 versus the RX 6500 XT's 11842. The data suggests that the K20Xm may perform relatively better in Metal-based workloads, which are typically associated with Apple ecosystems, though we cannot confirm this without a direct comparison.

The RX 6500 XT's other scores paint a picture of a versatile card. Its Passmark G3D score of 9608 is its strongest showing, followed by Passmark GPU Compute at 4456. In contrast, its DirectX scores are low, with DX9 at 108, DX10 at 60, DX11 at 90, and DX12 at 38. These low DirectX scores, alongside a 3DMark Steel Nomad DX12 score of just 235, suggest that while the OpenCL compute performance is excellent, its raw DirectX gaming performance is not its primary strength in this dataset.

FAQ

Q: Which GPU has a higher average benchmark score?

A: The NVIDIA Tesla K20Xm has a higher average benchmark score of 12625, compared to the AMD Radeon RX 6500 XT's 11842.

Q: How much faster is the AMD Radeon RX 6500 XT in the Geekbench OpenCL test?

A: The RX 6500 XT scores 48289, which is 64.4% higher than the Tesla K20Xm's 17215 in that specific test.

Q: Does the NVIDIA Tesla K20Xm support ray tracing?

A: No, the Tesla K20Xm has no ray tracing cores specified. In contrast, the AMD Radeon RX 6500 XT includes 16 ray tracing cores.

Q: What is the memory bandwidth difference between the two cards?

A: The Tesla K20Xm has a memory bandwidth of 249.6 GB/s, while the AMD Radeon RX 6500 XT has a bandwidth of 143.9 GB/s.

Q: Which GPU is more power-efficient based on the data?

A: The AMD Radeon RX 6500 XT has a TDP of 107 W and a suggested PSU of 300 W, while the NVIDIA Tesla K20Xm has a TDP of 235 W and suggests a 550 W PSU, making the AMD card more power-efficient.

Q: What is the process node difference?

A: The AMD Radeon RX 6500 XT is built on a 6 nm process, while the NVIDIA Tesla K20Xm uses a 28 nm process.

Specification Differences

The two cards differ significantly across nearly every major specification category:

• Chip and Architecture: NVIDIA GK110 (Kepler) vs. AMD Navi 24 (RDNA 2.0).
• Process Node: 28 nm vs. 6 nm.
• Transistors: 7,080 million vs. 5,400 million.
• Die Size: 561 mm² vs. 107 mm².
• Transistor Density: 12.6M / mm² vs. 50.5M / mm².
• Memory: 6 GB GDDR5 vs. 4 GB GDDR6.
• Memory Bus Width: 384 bit vs. 64 bit.
• Memory Bandwidth: 249.6 GB/s vs. 143.9 GB/s.
• Shading Units: 2688 vs. 1024.
• TMUs: 224 vs. 64.
• ROPs: 48 vs. 32.
• Ray Tracing Cores: None vs. 16.
• Pixel Rate: 40.99 GPixel/s vs. 90.08 GPixel/s.
• Texture Rate: 164.0 GTexel/s vs. 180.2 GTexel/s.
• FP32 Performance: 3.935 TFLOPS vs. 5.765 TFLOPS.
• FP16 Performance: Not specified vs. 11.53 TFLOPS (2:1).
• TDP: 235 W vs. 107 W.
• Power Connectors: Not specified vs. 1x 6-pin.
• Suggested PSU: 550 W vs. 300 W.
• Bus Interface: PCIe 3.0 x16 vs. PCIe 4.0 x4.
• Display Outputs: No outputs vs. 1x HDMI 2.1, 1x DisplayPort 1.4a.
• DirectX Support: 12 (11_0) vs. 12 Ultimate (12_2).
• Vulkan Support: 1.2.175 vs. 1.4.
• Release Date: 2012-11-11 vs. 2022-01-18.

The Verdict

The data presents a clear split. The AMD Radeon RX 6500 XT is the definitive winner in compute performance, as evidenced by its 64.4% lead in the Geekbench OpenCL test. Its higher FP32 throughput (5.765 TFLOPS vs. 3.935 TFLOPS) and FP16 support (11.53 TFLOPS) further reinforce its compute advantage. It is also the only one of the two with display outputs, making it the sole option for any visual output tasks.

However, the NVIDIA Tesla K20Xm maintains a higher average benchmark score, driven by its strong Geekbench Metal result. Its massive memory bus (384-bit) and higher bandwidth (249.6 GB/s) suggest it may excel in memory-bound workloads that the current benchmark suite does not fully capture. Its larger transistor count and die size also point to a design philosophy focused on raw throughput rather than efficiency.

For users seeking a modern, feature-rich GPU with strong compute performance and display capabilities, the AMD Radeon RX 6500 XT is the logical choice based on this data. For scenarios where Metal API performance or massive memory bandwidth is critical, the older NVIDIA Tesla K20Xm shows its merits. The choice ultimately depends on which workloads are prioritized, as the benchmark results indicate that neither card is a universal winner.