AMD Radeon RX 6650 XT vs NVIDIA Tesla K20m Comparison

The AMD Radeon RX 6650 XT and NVIDIA Tesla K20m represent two distinct eras of GPU design, separated by nearly a decade of architectural evolution. The data reveals a split decision: the Tesla K20m dominates in OpenCL compute workloads, while the Radeon delivers a staggering performance advantage in modern graphics APIs. The average benchmark scores place them close—19,765 for the AMD card versus 19,089 for the NVIDIA—but this aggregate figure masks the fundamental divergence in their capabilities. The RX 6650 XT sits at the 65th percentile of all GPUs, while the Tesla K20m trails just behind at the 64th, indicating that while their overall standing is similar, their respective strengths and weaknesses are sharply defined.

Head-to-Head Benchmarks

The two available direct comparisons paint a clear picture of generational specialization. In Geekbench OpenCL, the NVIDIA Tesla K20m posts a score of 16,241, decisively beating the AMD Radeon RX 6650 XT’s 10,111. This represents a 37.7% deficit for the Radeon, a substantial margin that highlights the Tesla’s raw compute throughput. The K20m’s architecture was designed for scientific and professional workloads, and this result reflects that heritage—its 2,496 shading units and 208 texture mapping units are organized for parallel number-crunching rather than graphical output. For users running OpenCL-based compute tasks, the Tesla is the clear victor in this head-to-head metric.

The situation reverses dramatically in Geekbench Vulkan. Here, the AMD Radeon RX 6650 XT achieves a score of 81,306, utterly dwarfing the Tesla K20m’s 21,936. The delta is a remarkable 270.7% in favor of the Radeon. This is not a marginal improvement; it is a generational chasm. Vulkan is a low-overhead graphics API that leverages modern hardware features like asynchronous compute and explicit memory control, areas where the Radeon’s RDNA 2.0 architecture excels. The Tesla K20m, with its Kepler design and lack of dedicated ray tracing hardware, simply cannot compete in this environment. The data shows that for any Vulkan-based gaming or modern rendering workload, the RX 6650 XT is in a completely different performance class.

These two results explain the overall win tally: one win for each card. However, the magnitude of the victories is not symmetrical. The Tesla’s 37.7% lead in OpenCL is significant, but the Radeon’s 270.7% lead in Vulkan is overwhelming. When considering the average benchmark score, the RX 6650 XT’s 19,765 edges out the Tesla’s 19,089, suggesting that the Radeon’s massive lead in Vulkan more than compensates for its loss in OpenCL. The nearest rivals for each card reinforce this positioning: the RX 6650 XT is within 0.8% of the NVIDIA Quadro K5200 and AMD FirePro W7000, while the Tesla K20m is within 0.4% of the NVIDIA GeForce GTX 780. This places both cards in a similar performance tier on average, but the composition of their scores could not be more different.

FAQ

Q: Which GPU is faster in the Geekbench Vulkan benchmark?

A: The AMD Radeon RX 6650 XT is overwhelmingly faster, scoring 81,306 compared to the NVIDIA Tesla K20m’s 21,936. This is a 270.7% advantage for the AMD card, indicating its superiority in modern graphics API workloads.

Q: Does the NVIDIA Tesla K20m outperform the AMD Radeon RX 6650 XT in any benchmark?

A: Yes. In the Geekbench OpenCL test, the Tesla K20m scores 16,241, which is 37.7% higher than the Radeon’s 10,111. The Tesla’s compute-oriented Kepler architecture gives it an edge in this specific workload.

Q: What are the average benchmark scores for each GPU?

A: The AMD Radeon RX 6650 XT has an average benchmark score of 19,765, while the NVIDIA Tesla K20m has an average of 19,089. This places the Radeon slightly ahead overall, despite losing the OpenCL head-to-head.

Q: How does each card rank against all other GPUs?

A: The AMD Radeon RX 6650 XT sits at the 65th percentile of all GPUs, while the NVIDIA Tesla K20m sits at the 64th percentile. This indicates they are nearly equivalent in overall performance distribution, but with very different performance profiles.

Q: Which GPU has more shading units?

A: The NVIDIA Tesla K20m has 2,496 shading units, which is more than the AMD Radeon RX 6650 XT’s 2,048. However, the Radeon’s higher clock speeds and architectural efficiency lead to superior results in many modern workloads.

Q: Which GPU supports the Vulkan API version 1.4?

A: The AMD Radeon RX 6650 XT supports Vulkan 1.4. The NVIDIA Tesla K20m only supports Vulkan 1.2.175, which is an older version of the specification.

Architecture Differences

The architectural divide between these two GPUs is vast, reflecting their different release dates and intended purposes. The AMD Radeon RX 6650 XT uses the Navi 23 chip built on RDNA 2.0 architecture, manufactured on a 7 nm process at TSMC. This modern node allows for a transistor density of 46.7 million per square millimeter, packing 11,060 million transistors into a 237 mm² die. The NVIDIA Tesla K20m, in contrast, uses the GK110 chip based on the older Kepler architecture, fabricated on a 28 nm process. Its transistor density is just 12.6 million per square millimeter, with 7,080 million transistors spread across a much larger 561 mm² die. This difference in manufacturing technology is a primary driver of the performance gap.

The Radeon’s RDNA 2.0 architecture introduces features that are absent from the Tesla’s Kepler design. Most notably, the RX 6650 XT includes 32 dedicated ray tracing cores, hardware that the Tesla K20m lacks entirely. The Kepler architecture also predates the unified memory and scheduling improvements found in modern GPUs. The Tesla’s 2,496 shading units and 208 TMUs are numerous, but they run at significantly lower clock speeds than the Radeon’s units. The RX 6650 XT has a base clock of 2055 MHz and a boost clock of 2635 MHz, while the Tesla’s clock speeds are not listed in the data, indicating a design focused on throughput over frequency.

Memory architecture also differs fundamentally. The Radeon uses 8 GB of GDDR6 memory on a 128-bit bus, achieving a bandwidth of 280.3 GB/s. The Tesla uses 5 GB of GDDR5 memory on a wider 320-bit bus, but its bandwidth is lower at 208.0 GB/s. The Radeon’s higher bandwidth, combined with its newer memory type, allows for faster data access in graphics-intensive scenarios. The Tesla’s larger bus width is a legacy of its professional compute design, but the lower effective memory speed limits its utility in modern applications. The Radeon also supports DirectX 12 Ultimate (12_2), while the Tesla only supports DirectX 12 (11_0), a significant gap for gaming compatibility.

Specification Differences

The two cards differ across nearly every major specification. The process node is a clear differentiator: the AMD Radeon RX 6650 XT is built on a 7 nm process, while the NVIDIA Tesla K20m uses a 28 nm process. This leads to a massive difference in transistor density, with the Radeon at 46.7 million transistors per square millimeter compared to the Tesla’s 12.6 million. The Radeon’s die size is smaller at 237 mm², yet it packs more transistors (11,060 million) than the Tesla’s 561 mm² die (7,080 million). Clock speeds are starkly different: the Radeon boasts a 2055 MHz base and 2635 MHz boost, while the Tesla has no listed base or boost clocks, suggesting a fixed operational frequency.

Memory configurations diverge significantly. The Radeon offers 8 GB of GDDR6 with a 128-bit bus and 280.3 GB/s bandwidth. The Tesla offers 5 GB of GDDR5 with a 320-bit bus and 208.0 GB/s bandwidth. The Radeon’s memory clock is 2190 MHz (17.5 Gbps effective), while the Tesla’s is 1300 MHz (5.2 Gbps effective). The Radeon has 2,048 shading units, 128 TMUs, and 64 ROPs, while the Tesla has 2,496 shading units, 208 TMUs, and only 40 ROPs. The Radeon’s pixel rate is 168.6 GPixel/s and texture rate is 337.3 GTexel/s, far exceeding the Tesla’s 36.71 GPixel/s and 146.8 GTexel/s. The Radeon’s FP32 performance is 10.79 TFLOPS, while the Tesla’s is 3.524 TFLOPS. The Radeon also supports FP16 at 21.59 TFLOPS, while the Tesla has no listed FP16 capability.

Power and interface specifications also differ. The Radeon has a TDP of 176 W and requires a single 8-pin power connector, while the Tesla has a TDP of 225 W and requires a 6-pin plus an 8-pin connector. The suggested PSU for the Radeon is 450 W, while the Tesla requires 550 W. The Radeon uses a PCIe 4.0 x8 interface, while the Tesla uses PCIe 2.0 x16. Display outputs are another major difference: the Radeon has 1x HDMI 2.1 and 3x DisplayPort 1.4a outputs, while the Tesla has no display outputs at all, confirming its role as a compute-only accelerator. The Radeon measures 267 mm in length, while the Tesla’s length is not specified.

The Verdict

The data presents a clear choice based on workload. For users running OpenCL-based compute tasks, the NVIDIA Tesla K20m is the superior option. Its 37.7% lead in that benchmark, coupled with its 2,496 shading units and 208 TMUs, makes it a capable workhorse for scientific and professional applications that leverage its compute-optimized Kepler architecture. The Tesla’s higher TDP of 225 W and requirement for a 550 W PSU are acceptable trade-offs for those prioritizing raw compute throughput over efficiency.

For anyone engaging in modern graphics workloads, gaming, or Vulkan-based rendering, the AMD Radeon RX 6650 XT is the definitive choice. Its 270.7% advantage in Vulkan is not just a win; it is a decisive generational leap. The Radeon’s support for DirectX 12 Ultimate, ray tracing cores, and a modern 7 nm process gives it capabilities that the Tesla simply cannot match. Its higher bandwidth, faster clock speeds, and significantly higher pixel and texture rates make it the only viable option for contemporary graphics applications. The Radeon’s lower TDP of 176 W and support for display outputs further solidify its position as a practical, modern GPU. The choice is not about which is better overall, but which is better suited to the specific task at hand.