NVIDIA B300 vs NVIDIA RTX PRO 4500 Blackwell Workstation Comparison

Head-to-Head Benchmarks

The database currently holds no recorded benchmark scores for either the NVIDIA B300 or the NVIDIA RTX PRO 4500 Blackwell Workstation. Both entries show an average benchmark score of zero, and there are no head-to-head benchmark results available for comparison. This means direct percentage deltas between the two cards cannot be calculated from recorded data.

What can be established from the existing specifications is the theoretical compute ceiling of each part. The B300 delivers 76.99 TFLOPS of FP32 throughput, which is 52.3% higher than the RTX PRO 4500's 50.53 TFLOPS. In FP16 workloads, the gap widens dramatically: the B300 reaches 1,231.8 TFLOPS using its 16:1 ratio, while the RTX PRO 4500 sustains 50.53 TFLOPS at a 1:1 ratio. That represents a 24.3x advantage for the B300 in mixed-precision math, though the RTX PRO 4500's 1:1 FP16 rate means it does not sacrifice precision for speed.

Pixel throughput tells the opposite story. The RTX PRO 4500 renders at 269.6 GPixel/s, which is 5.5x the B300's 48.77 GPixel/s. Texture fill rates are closer: the B300 posts 1,202.9 GTexel/s versus 789.5 GTexel/s for the RTX PRO 4500, a 52.4% lead for the server card. Memory bandwidth is also lopsided in favor of the B300, which moves 4.10 TB/s compared to 896.0 GB/s, a 4.6x difference.

Since no benchmark scores exist, the percentile ranking of both cards sits at 50, indicating they fall in the middle of the database's tracked GPUs based on recorded performance data. That ranking is provisional until actual workloads are logged.

Architecture Differences

Both processors are built on TSMC's 5 nm node, but they diverge sharply in scale and purpose. The B300 uses the GB110 chip under the Blackwell Ultra architecture, while the RTX PRO 4500 uses the GB203 chip under Blackwell 2.0. The B300 packs 104,000 million transistors, more than double the 45,600 million in the RTX PRO 4500. The RTX PRO 4500 has a published die size of 378 mm² and a transistor density of 120.6M per mm²; the B300's die size and density are not recorded.

The B300 is a server-class SXM module with no display outputs. The RTX PRO 4500 is a dual-slot workstation card with 4x DisplayPort 2.1b outputs. The B300 has no listed power connector and requires a suggested 1800 W PSU, while the RTX PRO 4500 uses a single 16-pin connector and a 550 W PSU. Thermal design power differs by a factor of seven: 1400 W for the B300 versus 200 W for the RTX PRO 4500.

Memory configurations are fundamentally different. The B300 uses 144 GB of HBM3e across a 4096-bit bus, while the RTX PRO 4500 uses 32 GB of GDDR7 across a 256-bit bus. The B300's memory runs at 2000 MHz (8 Gbps effective), whereas the RTX PRO 4500's memory runs at 1750 MHz (28 Gbps effective). The B300's much wider bus compensates for its lower per-pin speed, yielding 4.10 TB/s of bandwidth.

Compute resources also differ. The B300 has 18,944 shading units, 592 TMUs, 24 ROPs, and 592 tensor cores. The RTX PRO 4500 has 10,496 shading units, 328 TMUs, 112 ROPs, 82 ray tracing cores, and 328 tensor cores. The B300 has no listed RT core count, while the RTX PRO 4500's 82 RT cores are documented. The B300's 24 ROPs are unusually low for its compute capacity, limiting its pixel output to 48.77 GPixel/s despite its massive shader array. The RTX PRO 4500's 112 ROPs enable its much higher pixel rate of 269.6 GPixel/s.

API support is only recorded for the RTX PRO 4500, which lists DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The B300 has no API entries in the database, consistent with its server positioning where display APIs are less relevant. The B300's generation is noted as "Server Blackwell (Bxx)," while the RTX PRO 4500 belongs to "Blackwell PRO W (x000)." The B300's predecessor is Server Hopper and its successor is Server Rubin; the RTX PRO 4500's predecessor is Workstation Ada with no successor recorded.

FAQ

Q: Which card has higher FP32 compute performance?

A: The B300 delivers 76.99 TFLOPS of FP32, which is 52.3% higher than the RTX PRO 4500's 50.53 TFLOPS.

Q: How much memory bandwidth does each card provide?

A: The B300 offers 4.10 TB/s from 144 GB of HBM3e on a 4096-bit bus. The RTX PRO 4500 provides 896.0 GB/s from 32 GB of GDDR7 on a 256-bit bus.

Q: What are the power requirements?

A: The B300 has a 1400 W TDP and a suggested 1800 W PSU. The RTX PRO 4500 has a 200 W TDP and a suggested 550 W PSU.

Q: Which card can drive displays?

A: Only the RTX PRO 4500 has display outputs, specifically 4x DisplayPort 2.1b. The B300 has no outputs at all.

Q: How do transistor counts compare?

A: The B300 contains 104,000 million transistors on the GB110 chip. The RTX PRO 4500 contains 45,600 million transistors on the GB203 chip.

Q: What is the FP16 performance difference?

A: The B300 achieves 1,231.8 TFLOPS with a 16:1 ratio. The RTX PRO 4500 achieves 50.53 TFLOPS with a 1:1 ratio, meaning the B300 has a 24.3x advantage in FP16 throughput.

The Verdict

The data points to two entirely different products that share an architecture family but serve different physical realities. The B300 is a server accelerator with massive memory capacity, extreme FP16 throughput, and no display capability. The RTX PRO 4500 is a workstation GPU with balanced compute, high pixel throughput, and full display support.

For compute-heavy server workloads, particularly those leveraging FP16 with reduced precision, the B300 is the clear choice. Its 144 GB of HBM3e memory and 4.10 TB/s bandwidth far exceed what the RTX PRO 4500 can hold or move. The B300's 1,231.8 TFLOPS FP16 output is in a different performance class entirely.

For workstation tasks that require rendering to screens, the RTX PRO 4500 is the only option with display outputs. Its 269.6 GPixel/s pixel rate and 82 RT cores make it suitable for interactive graphics work. The RTX PRO 4500 also runs within a 200 W power envelope, making it feasible for a standard desktop workstation, whereas the B300 requires a 1400 W TDP and server infrastructure.

The 50th percentile ranking for both cards reflects the absence of benchmark data, not their relative standing. Until workloads are recorded and scored, the specification sheet is the only evidence available. Based on that evidence, the B300 dominates in raw compute and memory capacity, while the RTX PRO 4500 dominates in pixel output, display connectivity, and power efficiency.

Specification Differences

| Specification | NVIDIA B300 | NVIDIA RTX PRO 4500 Blackwell Workstation |

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

| Chip | GB110 | GB203 |

| Architecture | Blackwell Ultra | Blackwell 2.0 |

| Generation | Server Blackwell (Bxx) | Blackwell PRO W (x000) |

| Process Node | 5 nm | 5 nm |

| Transistors | 104,000 million | 45,600 million |

| Die Size | Not recorded | 378 mm² |

| Transistor Density | Not recorded | 120.6M / mm² |

| Base Clock | 1665 MHz | 1635 MHz |

| Boost Clock | 2032 MHz | 2407 MHz |

| Memory Clock | 2000 MHz (8 Gbps effective) | 1750 MHz (28 Gbps effective) |

| Memory Size | 144 GB | 32 GB |

| Memory Type | HBM3e | GDDR7 |

| Memory Bus | 4096 bit | 256 bit |

| Memory Bandwidth | 4.10 TB/s | 896.0 GB/s |

| Shading Units | 18944 | 10496 |

| TMUs | 592 | 328 |

| ROPs | 24 | 112 |

| RT Cores | Not recorded | 82 |

| Tensor Cores | 592 | 328 |

| Pixel Rate | 48.77 GPixel/s | 269.6 GPixel/s |

| Texture Rate | 1,202.9 GTexel/s | 789.5 GTexel/s |

| FP32 | 76.99 TFLOPS | 50.53 TFLOPS |

| FP16 | 1,231.8 TFLOPS (16:1) | 50.53 TFLOPS (1:1) |

| TDP | 1400 W | 200 W |

| Slot Width | SXM Module | Dual-slot |

| Power Connectors | Not recorded | 1x 16-pin |

| Suggested PSU | 1800 W | 550 W |

| Bus Interface | PCIe 5.0 x16 | PCIe 5.0 x16 |

| Display Outputs | No outputs | 4x DisplayPort 2.1b |

| DirectX | Not recorded | 12 Ultimate (12_2) |

| OpenGL | Not recorded | 4.6 |

| Vulkan | Not recorded | 1.4 |

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

| Release Date | 2025-09-10 | 2025-03-17 |

| Production Status | Active | Active |

Where Each One Wins

Compute density: The B300 wins decisively. Its 76.99 TFLOPS FP32 is 52.3% higher than the RTX PRO 4500, and its 1,231.8 TFLOPS FP16 is 24.3x higher. The B300's 592 tensor cores and 592 TMUs provide the resources for sustained math throughput.

Memory capacity and bandwidth: The B300 holds 144 GB of HBM3e and moves 4.10 TB/s, versus 32 GB and 896.0 GB/s for the RTX PRO 4500. For large datasets or models that exceed 32 GB, the B300 is the only option that fits.

Pixel rendering: The RTX PRO 4500 wins by a wide margin, producing 269.6 GPixel/s versus 48.77 GPixel/s for the B300. Its 112 ROPs compared to 24 ROPs explain this gap. Workstation applications that rasterize to displays will favor the RTX PRO 4500.

Texture throughput: The B300 leads with 1,202.9 GTexel/s versus 789.5 GTexel/s, a 52.4% advantage. This aligns with its higher TMU count of 592 versus 328.

Power efficiency: The RTX PRO 4500 operates at 200 W TDP with a 550 W suggested PSU. The B300 requires 1400 W and an 1800 W PSU. Per watt, the RTX PRO 4500 delivers more pixel throughput and a usable workstation form factor.

Display connectivity: The RTX PRO 4500 has 4x DisplayPort 2.1b outputs. The B300 has none. Any workflow requiring visual output must use the RTX PRO 4500.

Ray tracing: The RTX PRO 4500 has 82 dedicated RT cores. The B300 has no recorded RT core count. For ray-traced rendering workloads, the RTX PRO 4500 has documented hardware support.

Release timing: The RTX PRO 4500 launched on 2025-03-17, nearly six months before the B300's 2025-09-10 release date. The B300 is the newer product but targets a different segment.