AMD Radeon RX 6600 vs NVIDIA Tesla K40c Comparison

Head-to-Head Benchmarks

The only directly comparable measurement in the database is the Geekbench OpenCL test, and the result is decisive. The AMD Radeon RX 6600 scores 28,850 points, while the NVIDIA Tesla K40c scores 17,468 points. This gives the RX 6600 a 65.2% advantage, a substantial margin that reflects the architectural gap between the two cards.

Context from the nearest rivals section reinforces this outcome. The RX 6600's average benchmark score across all recorded tests is 19,036, placing it just ahead of the NVIDIA Quadro K6000 (19,030, a 0% delta) and the NVIDIA GeForce RTX 4050 Mobile (19,049, a -0.1% delta). The Tesla K40c, by contrast, has an average benchmark score of 17,468, which places it in a different performance tier entirely. Its nearest rivals include the AMD Radeon Pro 460 (17,509, a -0.2% delta), the AMD Radeon Pro 560 (17,551, a -0.5% delta), and the AMD Radeon 780M (17,588, a -0.7% delta). Notably, even the NVIDIA GeForce RTX 4060, with an average score of 17,639, sits only 1% above the Tesla K40c in this grouping.

The single head-to-head result shows the RX 6600 winning the only shared test, and the delta is large enough that no other benchmark in the database would plausibly close the gap. The RX 6600's additional benchmark results, such as 15,096 in Passmark G3D, 8,8398 in Geekbench Metal, and 67,623 in Geekbench Vulkan, all point to a card that operates in a much higher performance band than the Tesla K40c's single recorded OpenCL score. The Tesla K40c has no other benchmark entries in the database, so its 61st percentile ranking versus all GPUs is derived from that one result, while the RX 6600's 63rd percentile is supported by eleven separate measurements.

Where Each One Wins

The RX 6600 wins the only direct comparison, and its broader benchmark suite shows strengths across multiple API and compute workloads. In Geekbench Metal, it records 88,398 points, and in Geekbench Vulkan it records 67,623 points, both far above the Tesla K40c's single OpenCL result. The Passmark suite shows a balanced profile: 15,096 in G3D, 6,554 in GPU compute, 889 in G2D, and lower scores in legacy DirectX tests (197 in DX9, 152 in DX11, 95 in DX10, 51 in DX12). These numbers indicate a card that handles both modern and legacy workloads competently, with particular strength in compute and general 3D rendering.

The Tesla K40c, with only one benchmark result, offers no recorded wins in any database test. Its 17,468 OpenCL score is its sole data point, and it falls short of the RX 6600's 28,850 in the same test. The card's hardware specifications, such as 2,880 shading units and 240 texture mapping units, suggest raw parallel capacity, but the recorded performance does not translate into a benchmark advantage. The K40c's 12 GB of GDDR5 memory and 288.4 GB/s bandwidth are its notable assets, but no benchmark in the database isolates memory-bound workloads, so those specifications cannot be credited with any measured win.

For users prioritizing modern API support, the RX 6600 is the clear choice based on recorded data. It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the Tesla K40c supports DirectX 12 (11_0), OpenGL 4.6, and Vulkan 1.2.175. The RX 6600 also has display outputs (1x HDMI 2.1, 3x DisplayPort 1.4a), whereas the Tesla K40c has no display outputs at all, making it unsuitable for any direct video output scenario. For compute-only environments where the Tesla K40c's larger memory pool (12 GB versus 8 GB) might matter, the database provides no benchmark that demonstrates a corresponding performance benefit.

FAQ

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

A: The AMD Radeon RX 6600 wins the Geekbench OpenCL test with a score of 28,850 versus the NVIDIA Tesla K40c's 17,468, a 65.2% advantage.

Q: How does the RX 6600 compare to its nearest rivals in average benchmark score?

A: The RX 6600 has an average benchmark score of 19,036. It is essentially tied with the NVIDIA Quadro K6000 (19,030, a 0% delta) and sits slightly below the NVIDIA GeForce RTX 4050 Mobile (19,049, a -0.1% delta) and the NVIDIA Tesla K20m (19,089, a -0.3% delta).

Q: What is the Tesla K40c's average benchmark score and how does it rank?

A: The Tesla K40c has an average benchmark score of 17,468, derived from a single Geekbench OpenCL result. It ranks at the 61st percentile versus all GPUs, while the RX 6600 ranks at the 63rd percentile.

Q: Does the Tesla K40c win any benchmark in the database?

A: No. The Tesla K40c has only one recorded benchmark result (Geekbench OpenCL at 17,468), and it loses that test to the RX 6600. The RX 6600 records one win in the head-to-head comparison, and the Tesla K40c records zero wins.

Q: How do the two cards compare in terms of memory configuration?

A: The RX 6600 has 8 GB of GDDR6 memory on a 128-bit bus with 224.0 GB/s bandwidth, while the Tesla K40c has 12 GB of GDDR5 memory on a 384-bit bus with 288.4 GB/s bandwidth. The Tesla K40c has a larger memory pool and higher bandwidth, but no benchmark in the database reflects a performance advantage from this.

Q: What are the power connector and PSU requirements for each card?

A: The RX 6600 requires a single 8-pin power connector and a 300 W suggested PSU, with a TDP of 132 W. The Tesla K40c requires one 6-pin and one 8-pin power connector and a 550 W suggested PSU, with a TDP of 245 W.

Specification Differences

The two cards differ in nearly every specification category. The RX 6600 uses a 7 nm process node, while the Tesla K40c uses 28 nm. Transistor counts differ substantially: the RX 6600 has 11,060 million transistors on a 237 mm² die, giving a transistor density of 46.7 million per mm², whereas the Tesla K40c has 7,080 million transistors on a 561 mm² die, giving 12.6 million per mm². Clock speeds are also far apart: the RX 6600 has a base clock of 1626 MHz, a boost clock of 2491 MHz, and a game clock of 2044 MHz, while the Tesla K40c has a base clock of 745 MHz and a boost clock of 876 MHz.

Memory differs in size, type, bus width, and bandwidth. The RX 6600 has 8 GB of GDDR6 on a 128-bit bus with 224.0 GB/s bandwidth, while the Tesla K40c has 12 GB of GDDR5 on a 384-bit bus with 288.4 GB/s bandwidth. Memory clocks also differ: the RX 6600 runs at 1750 MHz (14 Gbps effective), and the Tesla K40c runs at 1502 MHz (6 Gbps effective). The RX 6600 has 1,792 shading units, 112 TMUs, 64 ROPs, and 28 ray tracing cores, while the Tesla K40c has 2,880 shading units, 240 TMUs, 48 ROPs, and no ray tracing cores. Pixel and texture rates follow suit: the RX 6600 achieves 159.4 GPixel/s and 279.0 GTexel/s, while the Tesla K40c achieves 52.56 GPixel/s and 210.2 GTexel/s. FP32 performance is 8.928 TFLOPS for the RX 6600 versus 5.046 TFLOPS for the Tesla K40c; the RX 6600 also has FP16 performance of 17.86 TFLOPS (2:1), while the Tesla K40c has no recorded FP16 capability.

Power and physical specifications differ as well. The RX 6600 has a TDP of 132 W, a dual-slot width, a 190 mm length (7.5 inches), a 110 mm height (4.3 inches), a 40 mm width (1.6 inches), and a PCIe 4.0 x8 interface. The Tesla K40c has a TDP of 245 W, a dual-slot width, a 267 mm length (10.5 inches), no recorded height or width, and a PCIe 3.0 x16 interface. The RX 6600 has display outputs (1x HDMI 2.1, 3x DisplayPort 1.4a), while the Tesla K40c has no outputs. Release dates are also far apart: the RX 6600 launched on 2021-10-12, and the Tesla K40c launched on 2013-10-07. The RX 6600's launch MSRP is 329 USD, while the Tesla K40c's launch MSRP is 7,699 USD.

Architecture Differences

The RX 6600 is built on AMD's RDNA 2.0 architecture, part of the Navi II (RX 6000) generation, using the Navi 23 chip. The Tesla K40c is built on NVIDIA's Kepler architecture, part of the Tesla Kepler (Kxx) generation, using the GK180 chip. Both are manufactured by TSMC, but the process nodes are generations apart: 7 nm for the RX 6600, 28 nm for the Tesla K40c. The RX 6600 has a higher transistor density (46.7 million per mm²) despite fewer total transistors (11,060 million versus 7,080 million), because its die is much smaller (237 mm² versus 561 mm²).

The RX 6600 supports modern API features including DirectX 12 Ultimate (12_2), which enables hardware ray tracing via its 28 ray tracing cores, and Vulkan 1.4. The Tesla K40c supports DirectX 12 (11_0) and Vulkan 1.2.175, and has no ray tracing cores. The RX 6600 also has FP16 support at 2:1 ratio, which the Tesla K40c lacks entirely. The RX 6600's memory architecture uses GDDR6 with a narrow 128-bit bus but high effective speed (14 Gbps), while the Tesla K40c uses GDDR5 with a wide 384-bit bus and a lower effective speed (6 Gbps). The RX 6600's predecessor is Navi and its successor is Navi III; the Tesla K40c's predecessor is Tesla Fermi and its successor is Tesla Maxwell. Both cards are end-of-life in production status.

The Verdict

The data is unambiguous. The AMD Radeon RX 6600 outperforms the NVIDIA Tesla K40c in the only shared benchmark by 65.2%, and it holds a higher average benchmark score (19,036 versus 17,468) and a higher percentile ranking (63rd versus 61st). The RX 6600 also offers modern architectural features, including ray tracing cores, DirectX 12 Ultimate support, and FP16 compute, none of which are present on the Tesla K40c. Its smaller size, lower power draw, and integrated display outputs make it a more practical card for general use.

The Tesla K40c retains advantages in memory capacity (12 GB versus 8 GB) and memory bandwidth (288.4 GB/s versus 224.0 GB/s), as well as a wider memory bus (384-bit versus 128-bit) and more shading units (2,880 versus 1,792). However, no benchmark in the database demonstrates a performance benefit from these specifications. The K40c also requires more power (245 W versus 132 W), a higher PSU rating (550 W versus 300 W), and additional power connectors, with no display output capability.

Users who need a functional GPU for modern workloads, including gaming, rendering, or compute tasks that leverage DirectX 12 Ultimate or Vulkan, should choose the RX 6600 based on its recorded benchmark performance and feature set. Users who specifically require 12 GB of memory or the Tesla Kepler platform characteristics, such as those in legacy compute environments, may consider the Tesla K40c, but the database provides no measured evidence that the K40c's memory advantages translate into faster performance. The RX 6600 is the stronger card in every measured metric.