AMD Radeon Instinct MI25 vs NVIDIA Quadro RTX 6000 Comparison

Head-to-Head Benchmarks

The recorded data shows a single direct comparison between these two workstation-class accelerators, and the NVIDIA Quadro RTX 6000 takes the win. In the Geekbench OpenCL test, the Quadro RTX 6000 scores 74,179 against the AMD Radeon Instinct MI25's 68,562, a delta of 8.2%. That is a clear, if not overwhelming, victory for NVIDIA in this compute-oriented workload. The gap is meaningful, but it is not a rout; the Instinct MI25 trails by a margin that places it in a lower competitive tier.

Looking at the broader database context, the Quadro RTX 6000's average benchmark score is 101,872, while the Instinct MI25's average is 68,562. The difference in aggregate performance is substantial, roughly 48% higher for the NVIDIA part. However, the head-to-head result is the only direct measurement available, and it shows an 8.2% advantage. The average score gap is larger because the Quadro RTX 6000 has a second benchmark result (Vulkan at 129,564) that inflates its mean, while the Instinct MI25 only has the single OpenCL entry.

The percentile rankings reinforce the separation. The Quadro RTX 6000 sits at the 94th percentile among all GPUs, while the Instinct MI25 sits at the 90th. That four-point gap in percentile terms indicates that the NVIDIA card is not just faster in this one test, it is more competitive against the entire field of graphics processors. The nearest rivals for the Quadro RTX 6000 include the AMD Radeon Pro Vega II Duo (average score 106,750, delta -4.6%) and the AMD Radeon Pro W6600X (107,342, delta -5.1%), meaning the Quadro is actually slightly slower than those two AMD parts on average. For the Instinct MI25, the nearest rivals are clustered tightly: the Intel Arc A770 (68,809, delta -0.4%), the NVIDIA CMP 90HX (69,000, delta -0.6%), and the AMD Radeon Pro WX 8200 (69,870, delta -1.9%). The Instinct MI25 is essentially at parity with those cards, while the Quadro RTX 6000 is a step above its own closest competitors in some cases.

Architecture Differences

The fundamental architectural split is between NVIDIA's Turing and AMD's GCN 5.0. The Quadro RTX 6000 uses the TU102 chip, built on a 12 nm process at TSMC, with 18,600 million transistors on a 754 mm² die. The Instinct MI25 uses the Vega 10 chip, manufactured by GlobalFoundries on a 14 nm process, with 12,500 million transistors on a 495 mm² die. The transistor density is nearly identical: 24.7M per mm² for NVIDIA and 25.3M per mm² for AMD. The Quadro RTX 6000 is a physically larger and more complex chip, but the process node advantage (12 nm vs. 14 nm) gives it a slight density edge per area.

The shading resources differ significantly. The Quadro RTX 6000 has 4,608 shading units, 288 texture mapping units, and 96 ROPs. The Instinct MI25 has 4,096 shading units, 256 TMUs, and 64 ROPs. That means NVIDIA has roughly 12.5% more shaders, 12.5% more texture units, and 50% more ROPs. The pixel rate tells the story: 169.9 GPixel/s for the Quadro versus 96.00 GPixel/s for the Instinct, a 77% advantage in raw pixel throughput. Texture rate is 509.8 GTexel/s versus 384.0 GTexel/s, a 33% advantage.

The most striking difference is in specialized compute hardware. The Quadro RTX 6000 includes 72 RT cores and 576 tensor cores, dedicated to ray tracing and AI workloads respectively. The Instinct MI25 has none, as GCN 5.0 predates AMD's dedicated ray tracing and matrix cores. This is a generational gap: the Quadro RTX 6000 is from the Turing generation (release date 2018-08-12), while the Instinct MI25 is from the earlier GCN 5.0 era (release date 2017-06-26). The Quadro RTX 6000 supports DirectX 12 Ultimate (12_2) and Vulkan 1.4, while the Instinct MI25 is limited to DirectX 12 (12_1) and Vulkan 1.3. Both support OpenGL 4.6.

Memory architecture is completely different. The Quadro RTX 6000 uses 24 GB of GDDR6 on a 384-bit bus, delivering 672.0 GB/s of bandwidth. The Instinct MI25 uses 16 GB of HBM2 on a 2048-bit bus, delivering 436.2 GB/s. Despite the much wider bus, HBM2's lower clock speed (852 MHz base, 1704 Mbps effective) caps the bandwidth below the GDDR6 implementation. The Quadro's memory clock is 1750 MHz with 14 Gbps effective data rate.

Where Each One Wins

The Quadro RTX 6000 wins the only direct benchmark, and it wins on every raw specification that matters for compute throughput. In OpenCL, it is 8.2% ahead. In pixel rate, it is 77% ahead. In texture rate, it is 33% ahead. In FP32 compute, it is 16.31 TFLOPS versus 12.29 TFLOPS, a 33% advantage. In FP16 compute, it is 32.62 TFLOPS versus 24.58 TFLOPS, a 33% advantage. The Quadro RTX 6000 also has more memory (24 GB vs. 16 GB) and higher bandwidth (672.0 GB/s vs. 436.2 GB/s).

The Instinct MI25's strengths are narrower. It has a slightly higher transistor density (25.3M vs. 24.7M per mm²), but that is a fabrication metric, not a performance one. It has a lower TDP? No, actually the Instinct MI25 has a higher TDP at 300 W versus 260 W for the Quadro. The Instinct MI25 also has a lower base clock (1400 MHz vs. 1440 MHz) and a much lower boost clock (1500 MHz vs. 1770 MHz). The only real advantages for the AMD card are its older, less power-hungry memory interface? No, HBM2 uses more power per bit but the bus width is enormous. The Instinct MI25 has no display outputs, which makes it unsuitable for any visualization task, while the Quadro RTX 6000 has 4x DisplayPort 1.4a and 1x USB Type-C.

For use cases, the data points to a clear split. The Quadro RTX 6000 is the choice for any workload involving ray tracing, AI inference (via tensor cores), or high-resolution rendering with its 24 GB frame buffer. The Instinct MI25, with its 16 GB HBM2 and no display outputs, is a pure compute accelerator for data center tasks that do not require graphics output. However, even in pure compute, the Quadro RTX 6000 is faster in FP32 and FP16, and its OpenCL score is higher. The Instinct MI25's only niche would be applications that specifically favor GCN architecture or require HBM2's latency characteristics, but the recorded benchmarks do not show any such advantage.

Specification Differences

The two cards differ in nearly every measurable specification. Process node: 12 nm (NVIDIA) vs. 14 nm (AMD). Transistors: 18,600 million vs. 12,500 million. Die size: 754 mm² vs. 495 mm². Base clock: 1440 MHz vs. 1400 MHz. Boost clock: 1770 MHz vs. 1500 MHz. Memory size: 24 GB vs. 16 GB. Memory type: GDDR6 vs. HBM2. Memory bus: 384 bit vs. 2048 bit. Memory bandwidth: 672.0 GB/s vs. 436.2 GB/s. Memory clock: 1750 MHz (14 Gbps effective) vs. 852 MHz (1704 Mbps effective). Shading units: 4,608 vs. 4,096. TMUs: 288 vs. 256. ROPs: 96 vs. 64. RT cores: 72 vs. none. Tensor cores: 576 vs. none. Pixel rate: 169.9 GPixel/s vs. 96.00 GPixel/s. Texture rate: 509.8 GTexel/s vs. 384.0 GTexel/s. FP32: 16.31 TFLOPS vs. 12.29 TFLOPS. FP16: 32.62 TFLOPS vs. 24.58 TFLOPS. TDP: 260 W vs. 300 W. Power connectors: 1x 6-pin + 1x 8-pin vs. 2x 8-pin. Suggested PSU: 600 W vs. 700 W. Display outputs: 4x DisplayPort 1.4a + 1x USB Type-C vs. no outputs. DirectX support: 12 Ultimate (12_2) vs. 12 (12_1). Vulkan support: 1.4 vs. 1.3. Both are dual-slot, PCIe 3.0 x16, 267 mm long, and 111 mm tall.

FAQ

Q: Which card has more memory bandwidth?

A: The NVIDIA Quadro RTX 6000 delivers 672.0 GB/s, while the AMD Radeon Instinct MI25 delivers 436.2 GB/s, despite the MI25 having a wider 2048-bit bus versus 384-bit.

Q: Does the AMD Radeon Instinct MI25 support ray tracing?

A: No, the MI25 has no RT cores. The NVIDIA Quadro RTX 6000 has 72 RT cores and 576 tensor cores for ray tracing and AI workloads.

Q: What is the average benchmark score for each card?

A: The Quadro RTX 6000 has an average benchmark score of 101,872, while the Instinct MI25 has an average of 68,562. The Quadro RTX 6000 also has a higher percentile ranking at 94 versus 90.

Q: Which card has a higher FP32 compute throughput?

A: The Quadro RTX 6000 reaches 16.31 TFLOPS, which is 33% higher than the Instinct MI25's 12.29 TFLOPS.

Q: Can the AMD Radeon Instinct MI25 connect to displays?

A: No, it has no display outputs. The Quadro RTX 6000 has 4x DisplayPort 1.4a and 1x USB Type-C.

Q: What is the manufacturing process difference?

A: The Quadro RTX 6000 uses a 12 nm process at TSMC, while the Instinct MI25 uses a 14 nm process at GlobalFoundries. The die sizes are 754 mm² and 495 mm² respectively.

The Verdict

The data is unambiguous. The NVIDIA Quadro RTX 6000 outperforms the AMD Radeon Instinct MI25 in the only direct benchmark, with an 8.2% lead in Geekbench OpenCL. It also has superior specifications in nearly every category: more memory (24 GB vs. 16 GB), higher bandwidth (672.0 GB/s vs. 436.2 GB/s), more shading units (4,608 vs. 4,096), more ROPs (96 vs. 64), and higher clock speeds (1770 MHz boost vs. 1500 MHz boost). It adds dedicated RT and tensor cores that the MI25 entirely lacks, and it supports newer DirectX and Vulkan versions.

The Quadro RTX 6000 is the better choice for any workload that involves graphics output, ray tracing, or AI inference, and it is also faster in pure compute. The Instinct MI25, being a compute-only accelerator with no display outputs, is suited for data center batch processing, but it is slower in FP32 (12.29 TFLOPS vs. 16.31 TFLOPS) and FP16 (24.58 TFLOPS vs. 32.62 TFLOPS). Its only advantages are a slightly higher transistor density (25.3M vs. 24.7M per mm²) and a lower average score gap to its nearest rivals, but neither translates into a performance win.

For users choosing between these two, the Quadro RTX 6000 is the clear winner for interactive workstations, rendering, and any task that benefits from its 24 GB frame buffer and specialized cores. The Instinct MI25 is a legacy compute card that, while still competitive in its niche, is outclassed by the NVIDIA part in every recorded metric. The verdict is straightforward: pick the Quadro RTX 6000 unless the workload specifically requires AMD's GCN architecture and cannot use NVIDIA's feature set. The benchmark data does not support any scenario where the MI25 wins.