NVIDIA B300 vs NVIDIA GeForce RTX 5070 Mobile Comparison

Where Each One Wins

The recorded data shows a complete split in use cases, with each GPU winning in entirely different domains. The NVIDIA B300 is a server accelerator with no display outputs and no recorded benchmark scores, while the NVIDIA GeForce RTX 5070 Mobile is a laptop-class graphics processor with a full suite of DirectX, OpenGL, and Vulkan API support and nine recorded benchmark results. The B300 wins on sheer compute scale, memory capacity, and bandwidth, while the RTX 5070 Mobile wins on graphics feature support, pixel throughput, and practical portability.

The B300 delivers 76.99 TFLOPS of FP32 compute, which is 5.9 times the RTX 5070 Mobile's 13.13 TFLOPS. In FP16 workloads, the gap widens dramatically: the B300 reaches 1,231.8 TFLOPS using its 16:1 ratio, while the RTX 5070 Mobile manages 13.13 TFLOPS at a 1:1 ratio. This makes the B300 suited for dense AI training and inference workloads where mixed-precision tensor math dominates. The RTX 5070 Mobile, with its 1:1 FP16 ratio, delivers equal performance in both FP16 and FP32, a design point aimed at graphics and general compute rather than specialized deep learning.

Memory capacity and bandwidth reinforce the separation. The B300 carries 144 GB of HBM3e across a 4096-bit bus, delivering 4.10 TB/s of bandwidth. The RTX 5070 Mobile has 8 GB of GDDR7 on a 128-bit bus, yielding 384.0 GB/s. The B300 provides 18 times the memory and roughly 10.7 times the bandwidth. That scale suits large model weights and datasets; the RTX 5070 Mobile's memory is sufficient for laptop gaming and creative workloads but not for server-scale inference.

The RTX 5070 Mobile wins on pixel rate, recording 68.40 GPixel/s versus the B300's 48.77 GPixel/s. It also has 48 ROPs versus 24 on the B300, despite having far fewer shading units (4,608 versus 18,944) and TMUs (144 versus 592). The texture rate reverses the result: the B300 reaches 1,202.9 GTexel/s, roughly 5.9 times the RTX 5070 Mobile's 205.2 GTexel/s. The B300 is built for raw shading and texture throughput, while the RTX 5070 Mobile prioritizes pixel output for display-driven tasks.

Architecture Differences

Both GPUs use TSMC's 5 nm process node and come from NVIDIA, but they diverge sharply in chip design. The B300 uses the GB110 chip with the Blackwell Ultra architecture, classified in the Server Blackwell (Bxx) generation. The RTX 5070 Mobile uses the GB206 chip with the Blackwell 2.0 architecture, part of the GeForce 50 Mobile generation. The B300 builds on the Server Hopper lineage and has Server Rubin as its successor; the RTX 5070 Mobile descends from GeForce 40 Mobile and has no recorded successor.

Transistor counts show the scale difference. The B300 integrates 104,000 million transistors, while the RTX 5070 Mobile contains 21,900 million. The RTX 5070 Mobile has a recorded die size of 181 mm² and a transistor density of 121.0M per mm²; the B300's die size is not recorded. The B300 operates as an SXM Module with a 1400 W TDP and a suggested power supply of 1800 W, whereas the RTX 5070 Mobile is an IGP with a 50 W TDP and no power connectors. The B300 uses PCIe 5.0 x16; the RTX 5070 Mobile also uses PCIe 5.0 x16.

Clock behavior differs markedly. The B300 has a base clock of 1665 MHz and a boost of 2032 MHz. The RTX 5070 Mobile runs a base of 907 MHz and a boost of 1425 MHz. Memory clocks also diverge: the B300 runs at 2000 MHz with 8 Gbps effective, while the RTX 5070 Mobile runs at 1500 MHz with 24 Gbps effective. The RTX 5070 Mobile compensates for its lower clock speeds with a much narrower 128-bit bus, while the B300 uses a 4096-bit bus to achieve its bandwidth.

The RTX 5070 Mobile includes 36 ray tracing cores and 144 tensor cores. The B300's ray tracing core count is not recorded, but it has 592 tensor cores. Both use tensor cores, but the B300's tensor throughput is substantially higher given its FP16 performance. The RTX 5070 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4; the B300 has no recorded API support. The B300 has no display outputs, while the RTX 5070 Mobile's outputs are listed as "Portable Device Dependent."

FAQ

Q: Which GPU has higher raw FP32 compute performance?

A: The NVIDIA B300 records 76.99 TFLOPS of FP32 compute, which is 5.9 times the 13.13 TFLOPS delivered by the NVIDIA GeForce RTX 5070 Mobile.

Q: How do the memory subsystems compare?

A: The B300 uses 144 GB of HBM3e on a 4096-bit bus with 4.10 TB/s bandwidth. The RTX 5070 Mobile has 8 GB of GDDR7 on a 128-bit bus with 384.0 GB/s bandwidth. The B300 provides 18 times the capacity and roughly 10.7 times the bandwidth.

Q: Does the RTX 5070 Mobile support modern graphics APIs?

A: Yes. The RTX 5070 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The B300 has no recorded API support.

Q: What is the power requirement difference?

A: The B300 has a 1400 W TDP with a suggested power supply of 1800 W. The RTX 5070 Mobile has a 50 W TDP and requires no power connectors.

Q: Which GPU has better pixel throughput?

A: The RTX 5070 Mobile records 68.40 GPixel/s, which is higher than the B300's 48.77 GPixel/s. This aligns with the RTX 5070 Mobile's 48 ROPs versus the B300's 24 ROPs.

Q: Are there any recorded benchmark scores for the B300?

A: No. The B300 has no benchmark entries and an average benchmark score of 0. The RTX 5070 Mobile has nine recorded benchmark scores with an average of 29,928.

Specification Differences

The two GPUs differ across nearly every recorded specification. The process node is identical (5 nm, TSMC), as is the bus interface (PCIe 5.0 x16), but all other fields diverge.

| Specification | NVIDIA B300 | NVIDIA GeForce RTX 5070 Mobile |

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

| Chip | GB110 | GB206 |

| Architecture | Blackwell Ultra | Blackwell 2.0 |

| Generation | Server Blackwell (Bxx) | GeForce 50 Mobile |

| Transistors | 104,000 million | 21,900 million |

| Die Size | Not recorded | 181 mm² |

| Transistor Density | Not recorded | 121.0M / mm² |

| Base Clock | 1665 MHz | 907 MHz |

| Boost Clock | 2032 MHz | 1425 MHz |

| Memory Clock | 2000 MHz, 8 Gbps effective | 1500 MHz, 24 Gbps effective |

| Memory Size | 144 GB | 8 GB |

| Memory Type | HBM3e | GDDR7 |

| Memory Bus Width | 4096 bit | 128 bit |

| Memory Bandwidth | 4.10 TB/s | 384.0 GB/s |

| Shading Units | 18,944 | 4,608 |

| TMUs | 592 | 144 |

| ROPs | 24 | 48 |

| Ray Tracing Cores | Not recorded | 36 |

| Tensor Cores | 592 | 144 |

| Pixel Rate | 48.77 GPixel/s | 68.40 GPixel/s |

| Texture Rate | 1,202.9 GTexel/s | 205.2 GTexel/s |

| FP32 Performance | 76.99 TFLOPS | 13.13 TFLOPS |

| FP16 Performance | 1,231.8 TFLOPS (16:1) | 13.13 TFLOPS (1:1) |

| TDP | 1400 W | 50 W |

| Slot Width | SXM Module | IGP |

| Power Connectors | Not recorded | None |

| Suggested PSU | 1800 W | Not recorded |

| Display Outputs | No outputs | Portable Device Dependent |

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

| OpenGL | Not recorded | 4.6 |

| Vulkan | Not recorded | 1.4 |

| Release Date | 2025-09-10 | 2025-04-14 |

| Predecessor | Server Hopper | GeForce 40 Mobile |

| Successor | Server Rubin | Not recorded |

Release timing also differs: the B300 launched on 2025-09-10, while the RTX 5070 Mobile launched on 2025-04-14, roughly five months earlier.

Head-to-Head Benchmarks

The head-to-head benchmark table is empty, and the win counts are 0 for both GPUs. The B300 has no recorded benchmarks, so direct comparison data does not exist. However, the RTX 5070 Mobile has its own benchmark suite, and its nearest rivals provide context for evaluating its standing.

The RTX 5070 Mobile records an average benchmark score of 29,928 across nine tests. Its percentile rank among all GPUs is 75, indicating that it outperforms three-quarters of the database's tracked graphics processors. Its closest rival is the NVIDIA GeForce RTX 3070 Ti, which scores 29,945, a delta of -0.1 percent. The NVIDIA GeForce RTX 2080 Ti scores 29,783, putting the RTX 5070 Mobile 0.5 percent ahead. AMD's Radeon RX 6800 scores 30,095, meaning the RTX 5070 Mobile trails by 0.6 percent. The AMD Radeon RX 6700 scores 30,433, leaving the RTX 5070 Mobile 1.7 percent behind.

Individual benchmark results show the RTX 5070 Mobile's strongest areas. In Geekbench OpenCL, it scores 122,238, and in Geekbench Vulkan, it scores 116,960. These represent the two highest raw scores in its suite. PassMark G3D gives 20,355, while PassMark GPU Compute gives 8,279. DirectX 9 yields 214, DirectX 11 yields 192, DirectX 10 yields 129, and DirectX 12 yields 93. The PassMark G2D score is 896.

The spread between DirectX versions is notable. The RTX 5070 Mobile scores 214 in DirectX 9, 192 in DirectX 11, 129 in DirectX 10, and 93 in DirectX 12. That ordering suggests better optimization for older API paths, though the DirectX 12 Ultimate support indicates modern feature readiness. The Geekbench scores, which are substantially higher than the PassMark scores, reflect different workload types: Geekbench's compute tests reward raw throughput, while PassMark's DirectX tests exercise graphics pipeline efficiency.

The B300's absence from benchmarks means no direct win-loss record exists. Its percentile rank of 50 across all GPUs reflects the lack of measured data rather than real-world performance. The RTX 5070 Mobile's percentile of 75, by contrast, comes from actual recorded scores.

The Verdict

The data directs each GPU to a distinct audience. The NVIDIA B300 is a server accelerator for large-scale compute environments. Its 144 GB of HBM3e memory, 4.10 TB/s bandwidth, and 76.99 TFLOPS of FP32 performance position it for AI training and inference workloads where model sizes exceed what a laptop GPU can hold. Its 1,231.8 TFLOPS of FP16 performance, achieved at a 16:1 ratio, indicates a heavy emphasis on tensor operations. The 1400 W TDP and 1800 W suggested power supply confirm a datacenter deployment profile, not a workstation or client system.

The NVIDIA GeForce RTX 5070 Mobile is a mobile graphics processor for laptops. Its 50 W TDP, IGP form factor, and lack of power connectors make it suitable for battery-powered systems. Its 13.13 TFLOPS of FP32 and FP16 performance at a 1:1 ratio supports both gaming and general compute. The 36 ray tracing cores and full DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support equip it for modern graphics workloads. Its 68.40 GPixel/s pixel rate, the higher of the two GPUs, serves display-driven tasks.

Benchmark data confirms the RTX 5070 Mobile's competitive standing. Its average score of 29,928 places it within 0.1 percent of the RTX 3070 Ti and 0.5 percent ahead of the RTX 2080 Ti, while trailing the RX 6800 by 0.6 percent and the RX 6700 by 1.7 percent. The 75th percentile rank shows it sits above most tracked GPUs. The B300 has no such data, so its performance relative to rivals cannot be assessed from recorded measurements.

The choice between these two GPUs depends entirely on workload context. Server operators needing massive memory bandwidth and tensor throughput should select the B300. Mobile users needing a compact, low-power GPU with modern graphics API support should select the RTX 5070 Mobile. The two products do not compete in the same market segment, and the recorded specifications reinforce that separation at every level: memory type, power envelope, form factor, and compute orientation.