AMD Radeon RX 7900 XTX vs NVIDIA Tesla K20m Comparison

The AMD Radeon RX 7900 XTX and the NVIDIA Tesla K20m represent two vastly different eras of GPU design, separated by nearly a decade of architectural evolution. The data shows a decisive performance gap, with the Radeon securing a 210.7% lead in Geekbench OpenCL and a 290.3% lead in Geekbench Vulkan, yet both cards occupy the same 64th percentile ranking among all GPUs, a statistical oddity driven by their respective benchmark pools. This analysis breaks down where each card wins, the architectural chasm between them, and what the numbers mean for prospective users.

Where Each One Wins

The performance split between these two is not a matter of nuance—it is a categorical sweep. In the head-to-head benchmarks available, the AMD Radeon RX 7900 XTX wins 2 out of 2 tests, leaving the NVIDIA Tesla K20m with zero victories. The Radeon’s dominance is most pronounced in Vulkan, where it scores 85,612 against the Tesla’s 21,936, a 290.3% advantage. In OpenCL, the gap narrows slightly but remains overwhelming: 50,465 versus 16,241, a 210.7% margin.

For the Tesla K20m, there is no benchmark category where it emerges ahead. Its only recorded scores are the two Geekbench tests, both of which it loses by a factor of three or more. The Radeon’s additional benchmark suite—including PassMark DirectX 10, 11, and 12 tests, plus G2D and G3D scores—shows strengths in legacy API workloads, though the Tesla has no comparable data in those fields. The Radeon’s average benchmark score of 19,410 also edges out the Tesla’s 19,089, a 1.7% overall margin that masks the extreme variance in individual tests.

The Radeon’s wins are not incremental. They are generational. In Vulkan, the Radeon outperforms the Tesla by nearly three times, a gap that reflects not just faster clocks and more cores, but a fundamentally newer architecture designed for modern graphics APIs. The Tesla, a compute-focused accelerator from 2013, was never built for real-time rendering workloads like Vulkan, and its 21,936 score reflects that obsolescence.

Architecture Differences

The architectural gap between the AMD Radeon RX 7900 XTX and the NVIDIA Tesla K20m is stark, beginning with the manufacturing process. The Radeon uses a 5 nm node at TSMC, while the Tesla relies on a 28 nm process, also from TSMC. This process difference alone explains much of the performance delta: the Radeon packs 57,700 million transistors onto a 529 mm² die, achieving a transistor density of 109.1M per mm². The Tesla, by contrast, houses 7,080 million transistors on a larger 561 mm² die, yielding just 12.6M per mm²—an 8.7x density advantage for the Radeon.

The core configurations diverge wildly. The Radeon’s Navi 31 chip, built on RDNA 3.0 architecture (codenamed Plum Bonito), features 6,144 shading units, 384 texture mapping units, and 192 raster operation pipelines. It also includes 96 dedicated ray tracing cores, a feature entirely absent from the Tesla. The Tesla’s GK110 chip, based on Kepler architecture, has just 2,496 shading units, 208 TMUs, and 40 ROPs—roughly 40% of the Radeon’s shading units and 21% of its ROPs.

Memory subsystems tell a similar story. The Radeon ships with 24 GB of GDDR6 on a 384-bit bus, delivering 960.0 GB/s of bandwidth. The Tesla offers 5 GB of GDDR5 on a 320-bit bus, with 208.0 GB/s—a 4.6x bandwidth deficit. Clock speeds amplify this gap: the Radeon boosts to 2498 MHz with a 2365 MHz game clock, while the Tesla’s memory runs at 1300 MHz (5.2 Gbps effective), with no listed base or boost clocks for the core.

Compute throughput is where the architectures truly separate. The Radeon delivers 61.39 TFLOPS of FP32 performance and 122.8 TFLOPS of FP16 via a 2:1 ratio. The Tesla manages just 3.524 TFLOPS of FP32 and has no FP16 capability listed. Pixel fill rates are 479.6 GPixel/s versus 36.71 GPixel/s, and texture rates are 959.2 GTexel/s versus 146.8 GTexel/s. The Radeon also supports modern APIs like DirectX 12 Ultimate (12_2), Vulkan 1.4, and OpenGL 4.6, while the Tesla tops out at DirectX 12 (11_0), Vulkan 1.2.175, and OpenGL 4.6.

Physical and power characteristics differ as well. The Radeon is a dual-slot card measuring 287 mm in length, drawing 355 W with two 8-pin connectors and a 750 W suggested PSU. The Tesla is also dual-slot but shorter at 267 mm, consuming 225 W with a single 6-pin and 8-pin connector, and a 550 W suggested PSU. The Radeon offers display outputs (HDMI 2.1a, DisplayPort 2.1, USB Type-C), while the Tesla has no outputs—it is a compute-only accelerator. Both cards are end-of-life, but the Radeon launched in 2022, succeeding Navi II, while the Tesla launched in 2013, succeeding Tesla Fermi.

Head-to-Head Benchmarks

The two available head-to-head tests paint a clear picture of generational dominance. In Geekbench OpenCL, the AMD Radeon RX 7900 XTX scores 50,465 against the NVIDIA Tesla K20m’s 16,241. That 210.7% delta means the Radeon is more than three times faster in this compute-heavy workload. OpenCL is a cross-platform API that stresses raw throughput, and the Radeon’s 61.39 TFLOPS FP32 versus the Tesla’s 3.524 TFLOPS explains the margin—the Radeon has 17.4x the theoretical FP32 compute, though real-world scaling limits the observed advantage.

Geekbench Vulkan shows an even larger gap. The Radeon hits 85,612, while the Tesla manages 21,936—a 290.3% difference. Vulkan is a modern low-overhead API that benefits from newer hardware features like async compute and explicit queue management, which are absent or primitive on Kepler. The Radeon’s 96 ray tracing cores and RDNA 3.0 architecture are designed for this workload, while the Tesla’s GK110 predates Vulkan entirely, running it via translation layers that sap performance.

In the broader benchmark suite, the Radeon’s PassMark scores illustrate its versatility: 31,238 in G3D, 17,689 in GPU compute, and 1,267 in G2D. The Tesla has no corresponding data, limiting direct comparison. The Radeon’s average benchmark score of 19,410 places it within 0.4% of the NVIDIA GeForce GTX 1060 3 GB (19,334) and 1.2% ahead of the NVIDIA TITAN Xp (19,177), though it trails the NVIDIA Quadro K5200 by 1% and the AMD FirePro D300 by 1.2%. The Tesla’s average of 19,089 sits 0.2% ahead of the NVIDIA GeForce RTX 4050 Mobile (19,049) and 0.3% ahead of both the AMD Radeon RX 6600 (19,036) and NVIDIA Quadro K6000 (19,030), while lagging the NVIDIA GeForce GTX 780 by 0.4%.

The Verdict

The data is unambiguous: the AMD Radeon RX 7900 XTX is the superior card by every measurable metric. Its 210.7% OpenCL lead and 290.3% Vulkan lead are not close calls—they are landslides. For any workload involving modern graphics APIs, compute tasks, or gaming, the Radeon is the only rational choice. Its 24 GB of GDDR6 memory, 960.0 GB/s bandwidth, and 61.39 TFLOPS FP32 performance dwarf the Tesla’s 5 GB GDDR5, 208.0 GB/s, and 3.524 TFLOPS.

The NVIDIA Tesla K20m, however, has a narrow niche. Its 225 W power draw is 130 W lower than the Radeon’s 355 W, and its shorter 267 mm length may fit in more constrained chassis. For legacy compute workloads that rely on CUDA and Kepler-era optimizations, the Tesla’s 2,496 shading units and 3.524 TFLOPS might still function, but the lack of FP16 support and modern API compliance limits its future utility. Its 64th percentile ranking, tied with the Radeon, is misleading—it reflects a benchmark pool dominated by older cards, not parity in capability.

Who should pick which? The Radeon is for anyone needing maximum performance in DirectX 12 Ultimate, Vulkan 1.4, or OpenGL 4.6 workloads, with ray tracing and high-resolution textures. The Tesla is for niche users running Kepler-specific compute kernels where its 5 GB memory and 208.0 GB/s bandwidth suffice, and where power efficiency (225 W) matters more than speed. For everything else, the Radeon’s 3x+ performance advantage makes the choice trivial.

FAQ

Q: Which card has better Vulkan performance?

A: The AMD Radeon RX 7900 XTX scores 85,612 in Geekbench Vulkan, a 290.3% lead over the NVIDIA Tesla K20m’s 21,936.

Q: What is the FP32 compute difference?

A: The Radeon delivers 61.39 TFLOPS, while the Tesla offers 3.524 TFLOPS—a 17.4x theoretical gap.

Q: Do both cards support the same APIs?

A: No. The Radeon supports DirectX 12 Ultimate (12_2), Vulkan 1.4, and OpenGL 4.6. The Tesla supports DirectX 12 (11_0), Vulkan 1.2.175, and OpenGL 4.6.

Q: How much memory does each card have?

A: The Radeon has 24 GB of GDDR6 on a 384-bit bus with 960.0 GB/s bandwidth. The Tesla has 5 GB of GDDR5 on a 320-bit bus with 208.0 GB/s bandwidth.

Q: Which card has a higher average benchmark score?

A: The Radeon averages 19,410, slightly above the Tesla’s 19,089, a 1.7% overall margin.

Q: Are both cards still in production?

A: No. Both are end-of-life. The Radeon launched in 2022, while the Tesla launched in 2013.