AMD Radeon RX 6900 XT vs NVIDIA Quadro M6000 24 GB Comparison

# AMD Radeon RX 6900 XT vs NVIDIA Quadro M6000 24 GB

The database pits two very different workstation and enthusiast class cards against each other. The AMD Radeon RX 6900 XT is a triple-slot, RDNA 2.0 part built on the 7 nm process at TSMC, while the NVIDIA Quadro M6000 24 GB is a Maxwell 2.0 professional card on a 28 nm process. One is a consumer gaming flagship, the other a professional visualization workhorse. The benchmark results show a clear split: the RX 6900 XT dominates in raw compute and modern API workloads, while the Quadro M6000 holds its ground only in legacy and OpenCL tests. The data shows 2 head-to-head wins for the AMD card, and 0 for the NVIDIA card.

Head-to-Head Benchmarks

The most dramatic difference appears in geekbench_opencl. The AMD Radeon RX 6900 XT scores 187,673, while the NVIDIA Quadro M6000 24 GB scores 40,098. That is a delta of 368% in favor of the AMD card. This is not a small gap; it is a generational chasm. The RX 6900 XT's RDNA 2 architecture is built for high throughput compute workloads, and its 5120 shading units and 80 ray accelerators (RT cores) simply overwhelm the older Maxwell design.

The geekbench_vulkan test tells a similar story. The AMD card scores 148,525 against the NVIDIA card's 46,425, a 219.9% advantage. This lines up with the API support differences: the RX 6900 XT supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the Quadro M6000 supports DirectX 12 (12_1), OpenGL 4.6, and Vulkan 1.4. In modern, low-level APIs, the AMD part is simply faster.

Looking at the average benchmark score, the RX 6900 XT sits at 50,951, against the Quadro M6000's 43,262. The AMD card is 1.9% ahead of the nearest rival, the NVIDIA CMP 50HX, and 2% ahead of the AMD Radeon RX Vega. The Quadro M6000 trails by 2.4% behind the Intel Arc A550M. The percentile data places the RX 6900 XT in the 86th percentile of all GPUs, while the Quadro M6000 sits in the 83rd percentile. Both are above average, but the AMD card is clearly the better compute part.

Architecture Differences

The architectural gap is wide. The AMD Radeon RX 6900 XT uses the Navi 21 chip (RDNA 2.0) built on TSMC's 7 nm process. It packs 26,800 million transistors on a 520 mm² die. That works out to 51.5 million transistors per square millimeter. The NVIDIA Quadro M6000 24 GB, by contrast, uses the GM200 chip (Maxwell 2.0) on a 28 nm process at TSMC. It has 8,000 million transistors on a 601 mm² die, a density of 13.3 million per mm². Smaller geometry and newer architecture, plus a higher transistor budget, translate directly into the raw throughput advantage the RX 6900 XT shows.

Memory configurations also differ. The AMD card has 16 GB of GDDR6 on a 256-bit bus, delivering 512.0 GB/s of bandwidth. The Quadro has 24 GB of GDDR5 on a 384-bit bus, with 317.4 GB/s. The RX card has more memory bandwidth, but the NVIDIA card has more capacity. The AMD part has 5120 shading units, 320 texture mapping units, and 128 ROPs, while the NVIDIA part has 3072 shading units, 192 TMUs, and 96 ROPs. The AMD part also has 80 ray accelerators, which the Quadro does not have.

The GPU clock speeds tell part of the story. The RX 6900 XT base clock is 1825 MHz with a boost of 2250 MHz, and a game clock of 2015 MHz. The Quadro M6000 has a base of 988 MHz and a boost of 1114 MHz. In pure clock terms, the AMD card has a substantial frequency lead.

The AMD RX 6900 XT has a TDP of 300 W and needs dual 8-pin power connectors, while the Quadro M6000 is a 250 W board with a single 8-pin connector. The RX card is triple-slot, the M6000 is dual-slot. The RX 6900 XT is a native PCIe 4.0 x16 part; the Quadro M6000 is PCIe 3.0 x16.

Where Each One Wins

AMD Radeon RX 6900 XT wins for: raw compute, modern API performance, and memory bandwidth. In the geekbench OpenCL test, the RX 6900 XT leads by 368%; in Vulkan, the lead is 219.9%. The RX 6900 XT also supports newer display outputs (HDMI 2.1, DisplayPort 1.4a, USB Type-C) and API versions (DirectX 12 Ultimate, OpenGL 4.6, Vulkan 1.4). The card is a triple-slot design with 16 GB of GDDR6 memory and 512 GB/s of bandwidth. The 23.04 TFLOPS FP32 and 46.08 TFLOPS FP16 (2:1) figures are the fastest in this comparison. With a 86th percentile, the RX 6900 XT is among the upper tier of all GPUs in the database.

NVIDIA Quadro M6000 24 GB wins at: legacy OpenCL and compute workloads, and total VRAM capacity. The Quadro M6000's 24 GB GDDR5 at 317.4 GB/s is a larger memory pool than the 16 GB on the AMD card. The Quadro also leads in OpenCL (geekbench_opencl) with a 9.8% edge over the nearest rival, the NVIDIA GeForce RTX 5050 Mobile. The M6000 is a dual-slot card with a 250 W TDP and a 600 W recommended PSU, and its 3072 shading units at 988 MHz boost to 1114 MHz. Its DirectX 12 (12_1) API support and DisplayPort 1.2 outputs (with DVI) target professional compatibility.

NVIDIA Quadro M6000 24 GB wins at: legacy compatibility (OpenCL scores, DirectX 9, and G2D), large memory capacity. If the workload is VRAM-hungry and uses older DirectX paths, the 24 GB frame buffer and 384-bit bus matter.

AMD Radeon RX 6900 XT wins at: raw compute (FP32, FP16), modern APIs (Vulkan, OpenCL, DX12 Ultimate), memory bandwidth, and power limits. If the workload is a modern, compute-heavy DX12/Vulkan workload, the RX 6900 XT is the faster card.

FAQ

Q: Which card is faster in raw FP32 compute?

A: The AMD Radeon RX 6900 XT delivers 23.04 TFLOPS FP32, far ahead of the NVIDIA Quadro M6000's 6.844 TFLOPS. The AMD card also spec 46.08 TFLOPS FP16 (2:1).

Q: Which card has more memory?

A: The NVIDIA Quadro M6000 24 GB has 24 GB of GDDR5 on a 384-bit bus, with 317.4 GB/s of bandwidth. The AMD RX 6900 XT has 16 GB of GDDR6 on a 256-bit bus with 512.0 GB/s.

Q: Which card supports the newest DirectX?

A: The RX 6900 XT supports DirectX 12 Ultimate (12_2), while the Quadro M6000 supports DirectX 12 (12_1). AMD also supports Vulkan 1.4 and OpenGL 4.6.

Q: What is the power draw difference?

A: The RX 6900 XT has a 300 W TDP and requires two 8-pin power connectors. The M6000 has a 250 W TDP and a single 8-pin connector. The AMD card requires a 700 W PSU; the NVIDIA card is recommended at 600 W.

Q: Which card is better for a modern DirectX 12 workload?

A: The data shows the RX 6900 XT with a 187,673 OpenCL score and a 148,525 Vulkan score versus the M6000's 40,098 and 46,425 respectively. The AMD is the faster card for modern DX12 and Vulkan workloads.

The Verdict

From the measured data alone, the choice is straightforward. The AMD Radeon RX 6900 XT wins 2 out of 2 head-to-head benchmarks, and it leads in modern API performance and compute throughput. It is a triple-slot, 300 W, 7 nm Navi 21 monster with 5120 shading units and 80 RT cores. The NVIDIA Quadro M6000 24 GB is the card to choose only if the workload is dominated by legacy OpenCL and requires more than 16 GB of VRAM. For modern gaming, DX12, Vulkan, or raw FP32 throughput, the RX 6900 XT is the card to pick.

Specification Differences

| Field | AMD Radeon RX 6900 XT | NVIDIA Quadro M6000 24 GB |

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

| Chip | Navi 21 | GM200 |

| Architecture | RDNA 2.0 | Maxwell 2.0 |

| Process | 7 nm | 28 nm |

| Transistors | 26,800 million | 8,000 million |

| Die size | 520 mm² | 601 mm² |

| Transistor density | 51.5M / mm² | 13.3M / mm² |

| Base clock | 1825 MHz | 988 MHz |

| Boost clock | 2250 MHz | 1114 MHz |

| Game clock | 2015 MHz | N/A |

| Memory clock | 2000 MHz, 16 Gbps effective | 1653 MHz, 6.6 Gbps effective |

| Memory | 16 GB GDDR6 | 24 GB GDDR5 |

| Bus width | 256-bit | 384-bit |

| Bandwidth | 512.0 GB/s | 317.4 GB/s |

| Shading units | 5120 | 3072 |

| TMUs | 320 | 192 |

| ROPs | 128 | 96 |

| Ray accelerators | 80 | N/A |

| Pixel rate | 288.0 GPixel/s | 106.9 GPixel/s |

| Texture rate | 720.0 GTexel/s | 213.9 GTexel/s |

| FP32 | 23.04 TFLOPS | 6.844 TFLOPS |

| FP16 | 46.08 TFLOPS (2:1) | N/A |

| TDP | 300 W | 250 W |

| Slot width | Triple-slot | Dual-slot |

| Power connectors | 2x 8-pin | 1x 8-pin |

| Suggested PSU | 700 W | 600 W |

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

| Display outputs | 1x HDMI 2.1, 2x DisplayPort 1.4a, 1x USB Type-C | 1x DVI, 4x DisplayPort 1.2 |

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

| OpenGL | 4.6 | 4.6 |

| Vulkan | 1.4 | 1.4 |

| Length | 267 mm (10.5 inches) | 267 mm (10.5 inches) |

| Height | 120 mm (4.7 inches) | 111 mm (4.4 inches) |

| Width | 50 mm (2 inches) | N/A |

| Status | End-of-life | End-of-life |

| Release | 2020-10-27 | 2016-03-04 |

| Predecessor | Navi | Quadro Kepler |

| Successor | Navi III | Quadro Pascal |

| Launch MSRP | 999 USD | 4,999 USD |