NVIDIA B300 SXM6 AC vs NVIDIA RTX 5000 Mobile Ada Generation Comparison

The Verdict

The database comparison places the NVIDIA B300 SXM6 AC and the NVIDIA RTX 5000 Mobile Ada Generation at opposite ends of the performance spectrum. The B300 SXM6 AC is a server-class accelerator with an average benchmark score of 369,831, placing it in the 100th percentile of all GPUs recorded. The RTX 5000 Mobile Ada Generation, by contrast, scores 3,596 in its recorded 3DMark Steel Nomad DX12 test, sitting in the 21st percentile. The B300 SXM6 AC leads its nearest rival, the NVIDIA B200, by 7%, and the H200 NVL by 10.4%. The RTX 5000 Mobile is effectively tied with the GeForce GT 545, which shows a delta of only 0.1%, and trails the GeForce GT 735M by 0.6%. The data clearly indicates that the B300 SXM6 AC is designed for dense compute workloads where massive memory and throughput are required, while the RTX 5000 Mobile Ada Generation serves portable workstations needing moderate compute with display output capabilities.

Architecture Differences

The B300 SXM6 AC uses the GB110 chip under the Blackwell Ultra architecture, belonging to the Server Blackwell (Bxx) generation. It is fabricated on a 5 nm process at TSMC, with 208,000 million transistors packed into a 1628 mm² die, yielding a transistor density of 127.8M per mm². The RTX 5000 Mobile Ada Generation uses the AD103 chip under the Ada Lovelace architecture, from the Ada-MW generation. It is also fabricated on a 5 nm process at TSMC, but with 45,900 million transistors on a 379 mm² die, giving a density of 121.1M per mm². The B300 SXM6 AC has no display outputs, while the RTX 5000 Mobile has outputs dependent on the portable device. The B300 supports PCIe 6.0 x16, whereas the RTX 5000 Mobile uses PCIe 4.0 x16. The B300 lacks API support for DirectX, OpenGL, and Vulkan, while the RTX 5000 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Head-to-Head Benchmarks

The database does not contain any direct head-to-head benchmark entries between these two accelerators. Instead, the comparison relies on their respective standalone scores and nearest rival data. The B300 SXM6 AC records a Geekbench OpenCL score of 369,831, which is 7% above the NVIDIA B200's average of 345,482 and 10.4% above the H200 NVL's 334,891. It also leads the AMD Instinct MI300X by 16.3% and the NVIDIA L40S by 25%. The RTX 5000 Mobile Ada Generation records a 3DMark Steel Nomad DX12 score of 3,596. Its nearest competitors are far lower in the database: the GeForce GT 545 at 3,594 (0.1% behind), the GeForce GT 735M at 3,616 (0.6% ahead), the GeForce GTX 1050 at 3,629 (0.9% ahead), and the AMD Radeon HD 6770 at 3,649 (1.5% ahead). The recorded data shows no shared benchmark between the two, so a direct numerical comparison is not possible. However, the percentile gap is stark: the B300 sits at the absolute top of all GPUs, while the RTX 5000 Mobile sits near the lower quartile.

FAQ

Q: Which accelerator has the higher average benchmark score?

A: The NVIDIA B300 SXM6 AC has an average benchmark score of 369,831, while the NVIDIA RTX 5000 Mobile Ada Generation has an average of 3,596. The B300 is in the 100th percentile of all GPUs, while the RTX 5000 Mobile is in the 21st percentile.

Q: What are the memory configurations of the two accelerators?

A: The B300 SXM6 AC has 288 GB of HBM3e memory on an 8192-bit bus, providing 8.19 TB/s of bandwidth. The RTX 5000 Mobile has 16 GB of GDDR6 memory on a 256-bit bus, providing 576.0 GB/s of bandwidth.

Q: How do the transistor counts compare?

A: The B300 SXM6 AC has 208,000 million transistors on a 1628 mm² die. The RTX 5000 Mobile has 45,900 million transistors on a 379 mm² die. The B300 has a higher transistor density at 127.8M per mm² versus 121.1M per mm².

Q: Which accelerator supports display outputs?

A: The RTX 5000 Mobile Ada Generation supports display outputs that are portable device dependent. The B300 SXM6 AC has no display outputs.

Q: What is the power draw difference?

A: The B300 SXM6 AC has a TDP of 1100 W with a suggested power supply of 1500 W. The RTX 5000 Mobile has a TDP of 120 W and has no power connectors.

Q: What APIs are supported by each?

A: The B300 SXM6 AC does not support DirectX, OpenGL, or Vulkan. The RTX 5000 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Where Each One Wins

The B300 SXM6 AC wins decisively in raw compute throughput. Its FP32 performance is 76.99 TFLOPS, compared to 41.15 TFLOPS for the RTX 5000 Mobile. Its texture rate is 1,202.9 GTexel/s versus 643.0 GTexel/s. The B300 also has far more shading units (18,944 versus 9,728), TMUs (592 versus 304), and tensor cores (592 versus 304). The B300's memory bandwidth of 8.19 TB/s is over fourteen times higher than the RTX 5000 Mobile's 576.0 GB/s. The B300 also has a higher base clock at 1665 MHz versus 1425 MHz, though the RTX 5000 Mobile has a higher boost clock at 2115 MHz versus 2032 MHz. The B300's pixel rate is lower at 48.77 GPixel/s versus 236.9 GPixel/s for the RTX 5000 Mobile, indicating the B300 is not optimized for rasterization tasks.

The RTX 5000 Mobile wins in the areas of portability and graphics API support. It has a TDP of 120 W versus 1100 W for the B300, and it is an IGP with no power connectors. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the B300 has no API support. The RTX 5000 Mobile also has 76 RT cores, a feature the B300 does not list. The RTX 5000 Mobile's higher pixel rate and ROP count (112 versus 24) further indicate its suitability for rendering to displays, whereas the B300 is a compute-only accelerator.

Specification Differences

The two accelerators differ in nearly every measurable specification. The B300 SXM6 AC uses the GB110 chip with Blackwell Ultra architecture, while the RTX 5000 Mobile uses the AD103 chip with Ada Lovelace architecture. The B300 has 208,000 million transistors on a 1628 mm² die, versus 45,900 million on 379 mm² for the RTX 5000 Mobile. The B300 has 18,944 shading units, 592 TMUs, and 24 ROPs, while the RTX 5000 Mobile has 9,728 shading units, 304 TMUs, and 112 ROPs. The B300 lists 592 tensor cores but no RT cores; the RTX 5000 Mobile lists 304 tensor cores and 76 RT cores.

Memory differs substantially: the B300 has 288 GB of HBM3e on an 8192-bit bus with 8.19 TB/s bandwidth, while the RTX 5000 Mobile has 16 GB of GDDR6 on a 256-bit bus with 576.0 GB/s bandwidth. The B300's base clock is 1665 MHz and boost is 2032 MHz, while the RTX 5000 Mobile's base is 1425 MHz and boost is 2115 MHz. The B300 has a TDP of 1100 W with a suggested PSU of 1500 W, whereas the RTX 5000 Mobile has a TDP of 120 W with no power connectors. The B300 uses a PCIe 6.0 x16 interface, while the RTX 5000 Mobile uses PCIe 4.0 x16. The B300 has no display outputs; the RTX 5000 Mobile has portable device dependent outputs. The B300 supports no graphics APIs, while the RTX 5000 Mobile supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The B300 was released on September 10, 2025, while the RTX 5000 Mobile was released on March 20, 2023. The B300's predecessor is Server Hopper and successor is Server Rubin; the RTX 5000 Mobile's predecessor is Ampere-MW and successor is Blackwell-MW.