AMD Radeon RX 6600M vs NVIDIA Tesla K40m Comparison

Head-to-Head Benchmarks

The only directly comparable measurement in the database is the Geekbench OpenCL test, and it produces a decisive outcome. The AMD Radeon RX 6600M scores 67,765, while the NVIDIA Tesla K40m scores 19,885. That is a 240.8% advantage for the AMD part, meaning the RX 6600M delivers roughly 3.4 times the raw compute throughput in this OpenCL workload. The delta is so large that the two cards are not competing in the same performance tier; the RX 6600M lands in the 68th percentile of all GPUs in the database, while the Tesla K40m sits at the 65th percentile. Despite the percentile gap appearing modest, the actual score difference is enormous because the distribution of scores is dense around the mid-range.

The RX 6600M also holds a clear edge in the broader benchmark suite available for it, even though the Tesla K40m lacks comparable entries. The RX 6600M records an average benchmark score of 23,273 across all its tests, while the Tesla K40m averages 19,885 based solely on its single OpenCL result. The RX 6600M's nearest rivals in the database include the AMD Radeon R9 M290X at 23,276 (a 0% delta), the AMD Radeon Pro Vega 16 at 23,250 (0.1% ahead), and the NVIDIA P106-100 at 23,249 (0.1% ahead). These are effectively statistical ties, meaning the RX 6600M sits in a tightly packed cluster of mid-generation GPUs rather than at the top of the database. The Tesla K40m, by contrast, is bracketed by the AMD FirePro W7000 at 19,905 (0.1% behind the K40m), the AMD Radeon RX 6650 XT at 19,765 (0.6% behind), the AMD FirePro D300 at 19,637 (1.3% behind), and the NVIDIA Quadro K5200 at 19,602 (1.4% behind). So the K40m is actually the strongest performer in its immediate neighborhood, but that neighborhood is far below the RX 6600M's cluster.

Architecture Differences

The two GPUs come from entirely different architectural generations and design philosophies. The AMD Radeon RX 6600M uses the Navi 23 chip built on RDNA 2.0 architecture, fabricated on a 7 nm process at TSMC. It packs 11,060 million transistors into a 237 mm² die, yielding a transistor density of 46.7 million transistors per square millimeter. The NVIDIA Tesla K40m uses the GK110B chip with Kepler architecture, also built at TSMC but on a much older 28 nm process. It contains 7,080 million transistors spread across a 561 mm² die, giving a transistor density of only 12.6 million per square millimeter. The density difference is stark: the AMD chip crams nearly four times as many transistors into less than half the silicon area. That manufacturing advantage translates directly into clock speed headroom. The RX 6600M runs at a 2068 MHz base clock and boosts to 2416 MHz, with a game clock of 2177 MHz. The Tesla K40m operates at a 745 MHz base and 876 MHz boost. Even the RX 6600M's base clock is more than double the K40m's boost clock.

Memory architecture also diverges sharply. The RX 6600M uses 8 GB of GDDR6 on a 128-bit bus, with a 1750 MHz memory clock and 14 Gbps effective data rate, producing 224.0 GB/s of bandwidth. The Tesla K40m uses 12 GB of GDDR5 on a 384-bit bus, with a 1502 MHz memory clock and 6 Gbps effective rate, yielding 288.4 GB/s of bandwidth. The K40m actually wins on raw memory bandwidth thanks to its much wider bus, but the RX 6600M counters with a far faster memory technology. Shader resource counts tell a mixed story. The Tesla K40m has 2,880 shading units, 240 texture mapping units, and 48 ROPs. The RX 6600M has 1,792 shading units, 112 TMUs, and 64 ROPs. The K40m fields more shaders and TMUs, but the RX 6600M has more ROPs and, crucially, 28 ray tracing cores that the Kepler part lacks entirely. The RX 6600M also supports DirectX 12 Ultimate (12_2) and Vulkan 1.4, while the K40m is limited to DirectX 12 (11_1) and Vulkan 1.2.175. Neither card has tensor cores on either side.

Feature support and physical design reflect their intended roles. The RX 6600M is an integrated graphics processor with a 100 W TDP, no power connectors, no display outputs, and a PCIe 4.0 x8 interface. The Tesla K40m is a dual-slot card measuring 267 mm (10.5 inches), requires a 550 W suggested PSU, and has no display outputs at all. The RX 6600M's display outputs are listed as portable device dependent, reflecting its mobile design. The K40m is a compute-focused accelerator with no video output capability. Both are end-of-life products, but the RX 6600M launched in 2021 as part of the Radeon RX 6000 series, succeeding Polaris Mobile. The Tesla K40m launched in 2013 as part of the Tesla Kepler generation, succeeding Tesla Fermi and later succeeded by Tesla Maxwell.

The Verdict

The data points to a clear recommendation for almost any workload. The AMD Radeon RX 6600M beats the NVIDIA Tesla K40m by 240.8% in the only shared benchmark, Geekbench OpenCL. It also has a higher average benchmark score (23,273 versus 19,885) and sits in a higher percentile tier (68th versus 65th). The RX 6600M is the faster card by a wide margin in compute tasks, and it brings modern features like ray tracing cores, DirectX 12 Ultimate support, and a far more efficient 7 nm process. The Tesla K40m's advantages are narrower but real: it offers 12 GB of memory versus 8 GB, a wider 384-bit bus, higher memory bandwidth at 288.4 GB/s, and more shading units (2,880 versus 1,792). For workloads that are memory-capacity bound or favor high shader counts over clock speed, the K40m could hold relevance. However, its 28 nm process, much lower clocks, and lack of modern API support make it difficult to recommend for new deployments.

The RX 6600M is the obvious pick for general compute, modern gaming APIs, and any ray-traced workload. The Tesla K40m is only sensible for legacy compute stacks that specifically require Kepler-era CUDA behavior, or for applications that need its 12 GB frame buffer and higher memory bandwidth. The RX 6600M's nearest rivals are all within 0.2% of its average score, indicating that it performs in line with mid-range GPUs from its era, but the K40m's nearest rivals are all at least 0.1% to 1.4% behind it, making it a stronger performer within its own much lower tier. In direct comparison, though, the RX 6600M is simply in another class.

Specification Differences

The table below highlights only the fields where the two cards differ.

| Specification | AMD Radeon RX 6600M | NVIDIA Tesla K40m |

|---|---|---|

| Architecture | RDNA 2.0 | Kepler |

| Process node | 7 nm | 28 nm |

| Transistors | 11,060 million | 7,080 million |

| Die size | 237 mm² | 561 mm² |

| Transistor density | 46.7M / mm² | 12.6M / mm² |

| Base clock | 2068 MHz | 745 MHz |

| Boost clock | 2416 MHz | 876 MHz |

| Memory clock | 1750 MHz (14 Gbps effective) | 1502 MHz (6 Gbps effective) |

| Memory size | 8 GB | 12 GB |

| Memory type | GDDR6 | GDDR5 |

| Bus width | 128 bit | 384 bit |

| Memory bandwidth | 224.0 GB/s | 288.4 GB/s |

| Shading units | 1792 | 2880 |

| TMUs | 112 | 240 |

| ROPs | 64 | 48 |

| Ray tracing cores | 28 | None |

| Pixel rate | 154.6 GPixel/s | 52.56 GPixel/s |

| Texture rate | 270.6 GTexel/s | 210.2 GTexel/s |

| FP32 | 8.659 TFLOPS | 5.046 TFLOPS |

| FP16 | 17.32 TFLOPS (2:1) | None |

| TDP | 100 W | 245 W |

| Slot width | IGP | Dual-slot |

| Power connectors | None | Not specified |

| Suggested PSU | None | 550 W |

| Bus interface | PCIe 4.0 x8 | PCIe 3.0 x16 |

| Display outputs | Portable Device Dependent | No outputs |

| DirectX support | 12 Ultimate (12_2) | 12 (11_1) |

| Vulkan support | 1.4 | 1.2.175 |

| Dimensions | Not specified | 267 mm (10.5 inches) |

| Release date | 2021-05-30 | 2013-11-21 |

| Predecessor | Polaris Mobile | Tesla Fermi |

| Successor | None | Tesla Maxwell |

| Launch MSRP | None | 7,699 USD |

FAQ

Q: Which GPU is faster in OpenCL compute?

A: The AMD Radeon RX 6600M scores 67,765 in Geekbench OpenCL, while the NVIDIA Tesla K40m scores 19,885. The RX 6600M leads by 240.8%.

Q: Does the Tesla K40m have more memory?

A: Yes, the Tesla K40m has 12 GB of GDDR5 on a 384-bit bus, while the RX 6600M has 8 GB of GDDR6 on a 128-bit bus. The K40m also has higher memory bandwidth at 288.4 GB/s versus 224.0 GB/s.

Q: Which card supports ray tracing?

A: Only the AMD Radeon RX 6600M has ray tracing cores, with 28 of them. The NVIDIA Tesla K40m has no ray tracing cores.

Q: What are the average benchmark scores?

A: The RX 6600M has an average benchmark score of 23,273 across all its tests, while the Tesla K40m has an average of 19,885 based on its single Geekbench OpenCL result.

Q: How do the clock speeds compare?

A: The RX 6600M has a base clock of 2068 MHz and a boost clock of 2416 MHz. The Tesla K40m has a base clock of 745 MHz and a boost clock of 876 MHz.

Q: Which card is more power efficient?

A: The RX 6600M has a TDP of 100 W, while the Tesla K40m has a TDP of 245 W. The RX 6600M also uses a 7 nm process versus the K40m's 28 nm process.