NVIDIA Quadro K620M vs NVIDIA RTX PRO 6000 Blackwell Server Comparison

NVIDIA’s RTX PRO 6000 Blackwell Server and Quadro K620M occupy opposite ends of the professional GPU spectrum, separated by a decade of architecture evolution and a 20x difference in transistor count. The data shows two devices that share a vendor and a professional pedigree but diverge completely in capability, target workload, and physical design. The RTX PRO 6000 is a 600 W dual-slot PCIe 5.0 behemoth built for rack-mounted compute, while the K620M is a 30 W MXM module designed for embedded and mobile systems. Their benchmark scores are nearly identical—5996 versus 5957—yet this statistical parity masks a chasm in raw specifications and real-world applicability.

Where Each One Wins

The RTX PRO 6000 Blackwell Server wins decisively in every raw performance category that matters for modern compute workloads. Its 126.0 TFLOPS of FP32 throughput dwarfs the K620M’s 863.2 GFLOPS—a 146x advantage that translates directly to faster simulation, rendering, and AI inference. The 96 GB of GDDR7 memory on a 512-bit bus delivers 1.79 TB/s of bandwidth, versus the K620M’s 2 GB of DDR3 on a 64-bit bus at 16.02 GB/s. This is not a competition; it is a generational leap. The RTX PRO 6000 also supports hardware ray tracing (188 RT cores) and tensor acceleration (752 Tensor cores), features entirely absent from the K620M’s Maxwell architecture.

The Quadro K620M wins only in efficiency and form factor. Its 30 W TDP requires no external power connector, enabling deployment in portable devices and compact embedded systems. The MXM-A (3.0) interface allows hot-swappable modules in laptops and workstations, whereas the RTX PRO 6000 demands a 1000 W suggested PSU and a 267 mm dual-slot chassis. For legacy software compatibility, the K620M supports DirectX 12 (11_0) and OpenGL 4.6, while the RTX PRO 6000 offers DirectX 12 Ultimate (12_2) and Vulkan 1.4—both backward compatible but with far more headroom. The K620M’s 8 GB/s texture rate and 8.992 GPixel/s pixel rate are sufficient for basic 2D CAD and legacy OpenGL applications, but they represent less than 1% of the RTX PRO 6000’s corresponding rates.

Architecture Differences

The RTX PRO 6000 uses the GB202 chip on the Blackwell 2.0 architecture, fabricated on TSMC’s 5 nm process. This 750 mm² die houses 92,200 million transistors, achieving a density of 122.9 million per mm². The K620M uses the GM108S chip on the Maxwell architecture, built on a 28 nm process with a 77 mm² die containing 1,020 million transistors—a density of 13.2 million per mm². The process node difference alone explains the massive disparity in transistor count and power efficiency.

The Blackwell chip features 24,064 shading units, 752 TMUs, 192 ROPs, 188 RT cores, and 752 Tensor cores. The Maxwell chip has 384 shading units, 16 TMUs, and 8 ROPs, with no ray tracing or tensor core support. Clock speeds differ significantly: the RTX PRO 6000 runs at 1590 MHz base and 2617 MHz boost, while the K620M operates at 1029 MHz base and 1124 MHz boost. Memory architecture is equally divergent—GDDR7 at 1750 MHz (28 Gbps effective) versus DDR3 at 1001 MHz (2 Gbps effective). The RTX PRO 6000 supports PCIe 5.0 x16, while the K620M uses MXM-A 3.0. Display outputs also differ: four DisplayPort 2.1b connectors versus portable-device-dependent outputs.

FAQ

Q: Which GPU has higher benchmark scores?

A: The RTX PRO 6000 scores 5996 in 3DMark Steel Nomad DX12, while the K620M scores 5957 in Geekbench OpenCL. The RTX PRO 6000 leads by 39 points (0.7%), but both sit at the 34th percentile of all GPUs, indicating they are near-statistical ties in these specific tests.

Q: Can the Quadro K620M handle modern ray tracing workloads?

A: No. The K620M’s Maxwell architecture has no RT cores, whereas the RTX PRO 6000 includes 188 dedicated ray tracing cores. The K620M also lacks Tensor cores, making it unsuitable for AI acceleration tasks.

Q: What memory capacity and bandwidth differences exist?

A: The RTX PRO 6000 offers 96 GB of GDDR7 with 1.79 TB/s bandwidth on a 512-bit bus. The K620M provides 2 GB of DDR3 with 16.02 GB/s bandwidth on a 64-bit bus. The RTX PRO 6000 has 48x more memory and 112x more bandwidth.

Q: Are these GPUs comparable in power consumption?

A: No. The RTX PRO 6000 has a 600 W TDP and requires a single 16-pin power connector and a 1000 W suggested PSU. The K620M has a 30 W TDP, draws power directly from its MXM slot, and has no external power connector requirement.

Q: Which GPU is still in production?

A: The RTX PRO 6000 is marked as "Active" with a release date of March 2025. The K620M, released in February 2015, is listed as "End-of-life" with its predecessor listed as Quadro Fermi-M and successor as Quadro Maxwell-M.

Q: How do their nearest rivals compare?

A: The RTX PRO 6000’s closest competitor is the GeForce GTX 770M (avg score 6000, -0.1% delta), while the K620M’s nearest rival is the Radeon HD 8730M (avg score 5955, 0% delta). Both GPUs sit within 0.5% of their nearest peers, showing they are not outliers in their respective benchmark tiers.

Specification Differences

| Field | RTX PRO 6000 Blackwell Server | Quadro K620M |

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

| Chip | GB202 | GM108S |

| Architecture | Blackwell 2.0 | Maxwell |

| Process Node | 5 nm | 28 nm |

| Transistors | 92,200 million | 1,020 million |

| Die Size | 750 mm² | 77 mm² |

| Transistor Density | 122.9M / mm² | 13.2M / mm² |

| Base Clock | 1590 MHz | 1029 MHz |

| Boost Clock | 2617 MHz | 1124 MHz |

| Memory Clock | 1750 MHz (28 Gbps effective) | 1001 MHz (2 Gbps effective) |

| Memory Size | 96 GB | 2 GB |

| Memory Type | GDDR7 | DDR3 |

| Memory Bus | 512 bit | 64 bit |

| Memory Bandwidth | 1.79 TB/s | 16.02 GB/s |

| Shading Units | 24,064 | 384 |

| TMUs | 752 | 16 |

| ROPs | 192 | 8 |

| RT Cores | 188 | None |

| Tensor Cores | 752 | None |

| Pixel Rate | 502.5 GPixel/s | 8.992 GPixel/s |

| Texture Rate | 1,968.0 GTexel/s | 17.98 GTexel/s |

| FP32 | 126.0 TFLOPS | 863.2 GFLOPS |

| FP16 | 126.0 TFLOPS (1:1) | None |

| TDP | 600 W | 30 W |

| Slot Width | Dual-slot | MXM Module |

| Power Connectors | 1x 16-pin | None |

| Suggested PSU | 1000 W | None |

| Bus Interface | PCIe 5.0 x16 | MXM-A (3.0) |

| Display Outputs | 4x DisplayPort 2.1b | Portable Device Dependent |

| DirectX | 12 Ultimate (12_2) | 12 (11_0) |

| Dimensions | 267 mm x 111 mm x 40 mm | Not specified |

| Production Status | Active | End-of-life |

| Release Date | March 2025 | February 2015 |

Head-to-Head Benchmarks

The direct head-to-head benchmark table is empty, meaning no shared test was run on both GPUs. However, their respective single-benchmark scores provide comparable data points. The RTX PRO 6000 scored 5996 in 3DMark Steel Nomad DX12, a modern DirectX 12 Ultimate workload. The K620M scored 5957 in Geekbench OpenCL, a compute-oriented test. The RTX PRO 6000 leads by 0.65%, but this margin is within the noise of their nearest rivals. The RTX PRO 6000’s closest rival, the GTX 770M, scores 6000 (0.1% higher), while the K620M’s closest rival, the Radeon HD 8730M, scores 5955 (0.0% difference). Both GPUs sit at the 34th percentile of all GPUs, meaning they outperform roughly one-third of the database.

The most significant interpretation comes from what these scores do not capture. The RTX PRO 6000’s 126.0 TFLOPS FP32 throughput means its 3DMark score is likely bottlenecked by driver or API overhead rather than compute capability. The K620M’s 863.2 GFLOPS, by contrast, is fully utilized in its OpenCL test. The RTX PRO 6000’s 96 GB GDDR7 memory and 1.79 TB/s bandwidth would enable workloads far beyond what a 3DMark test can exercise, such as large language model inference or 8K video processing. The K620M’s 2 GB DDR3 and 16.02 GB/s bandwidth would stall on any modern dataset exceeding 2 GB.

The pixel rate difference is stark: 502.5 GPixel/s versus 8.992 GPixel/s. For a 4K display at 60 Hz, the RTX PRO 6000 can fill 56x more pixels than necessary, while the K620M would struggle with any resolution above 1080p. Texture rate follows the same pattern: 1,968 GTexel/s versus 17.98 GTexel/s, a 109x gap. These differences explain why the RTX PRO 6000 targets server racks with 4x DisplayPort 2.1b outputs, while the K620M’s portable-device-dependent outputs suit a single laptop panel.

The Verdict

The data presents a clear choice based on workload and deployment environment. The RTX PRO 6000 Blackwell Server is the only option for compute-intensive tasks: its 126.0 TFLOPS FP32, 188 RT cores, 752 Tensor cores, and 96 GB GDDR7 memory position it for AI training, real-time ray tracing, and massive parallel simulation. Its 600 W TDP and 1000 W PSU requirement demand a proper server chassis, but the performance ceiling justifies the infrastructure. The 34th percentile ranking in 3DMark is misleading; this GPU is designed for sustained throughput, not synthetic gaming benchmarks.

The Quadro K620M serves a narrow but legitimate niche: legacy professional applications in portable form factors. Its 30 W TDP and MXM-A 3.0 interface allow integration into rugged laptops and embedded systems where power and space are at a premium. The 2 GB DDR3 memory and 863.2 GFLOPS are sufficient for 2D CAD, basic 3D modeling, and multi-display desktop environments. Its end-of-life status and 2015 release date mean it is only viable for maintaining existing deployments, not new designs.

For new server installations, the RTX PRO 6000 is the only rational choice. For mobile workstations requiring Maxwell-era compatibility, the K620M remains functional but offers no path forward. The benchmark scores suggest parity, but the architecture differences reveal a 146x FP32 gap and 112x bandwidth gap. Pick the RTX PRO 6000 for compute, the K620M for legacy embedded use. There is no middle ground.