NVIDIA B300 SXM6 AC vs NVIDIA GB10 Comparison

The NVIDIA B300 SXM6 AC and the NVIDIA GB10 sit at opposite ends of the Server Blackwell generation, and the recorded data makes the split unmistakable: one is a datacenter accelerator built around an enormous die and 288 GB of HBM3e, while the other is a compact integrated solution tuned for efficiency. In the one head-to-head benchmark the database holds, Geekbench OpenCL, the B300 SXM6 AC posts 369831 against the GB10's 120137, a 207.8 percent gap. That single number frames the entire comparison, but it hides the very different design philosophies behind each product.

Where Each One Wins

The B300 SXM6 AC wins wherever raw throughput and memory scale decide the outcome. Its Geekbench OpenCL score of 369831 places it in the 100th percentile of all GPUs in the database, and its average benchmark score sits 7 percent ahead of the NVIDIA B200, 10.4 percent ahead of the NVIDIA H200 NVL, 16.3 percent ahead of the AMD Instinct MI300X, and 25 percent ahead of the NVIDIA L40S. Those are all top-tier datacenter parts, and the B300 outperforms every one of them in the aggregate data. Workloads that lean on tensor throughput, with 592 tensor cores versus the GB10's 384, and on massive parallel floating point, with 76.99 TFLOPS FP32 against 29.71 TFLOPS, clearly belong to the B300.

The GB10 wins on a different axis. It draws a 140 W TDP against the B300's 1100 W, needs no external power connectors, and fits within a 150 mm by 150 mm footprint with a height of 51 mm. It is classified as an IGP rather than an SXM module. Its average benchmark score of 117393 lands it in the 95th percentile of all GPUs, which is remarkable for its envelope: it is essentially even with the NVIDIA RTX 4000 SFF Ada Generation (0.3 percent ahead), 1.3 percent behind the AMD Radeon PRO W7700, 2.6 percent ahead of the NVIDIA Tesla V100 SXM2 16 GB, and 3 percent ahead of the NVIDIA RTX A5500 Mobile. In other words, the GB10 delivers performance comparable to professional desktop and legacy datacenter cards at a fraction of the power draw, and it carries 48 RT cores where the B300 lists none. For compact systems that still need a credible compute engine, that is the GB10's territory.

Architecture Differences

Both chips come from NVIDIA's Server Blackwell (Bxx) generation and both are fabbed at TSMC on a 5 nm process, but the shared stops there. The B300 SXM6 AC uses the GB110 die under the Blackwell Ultra architecture, with 208,000 million transistors packed into a 1628 mm² die, yielding a transistor density of 127.8M per mm². The GB10 uses the much smaller GB20B die under Blackwell 2.0, measuring 382 mm², with transistor count unrecorded in the database.

The core counts diverge sharply. The B300 carries 18944 shading units, 592 TMUs, 24 ROPs, and 592 tensor cores. The GB10 carries 6144 shading units, 384 TMUs, 48 ROPs, 384 tensor cores, and 48 RT cores. Clock behavior runs the other way: the GB10 boosts to 2418 MHz while the B300 tops out at 2032 MHz, though both share a 1665 MHz base clock.

Memory is where the architectural intent becomes clearest. The B300 pairs 288 GB of HBM3e with an 8192-bit bus running at 2000 MHz (8 Gbps effective), producing 8.19 TB/s of bandwidth. The GB10 pairs 128 GB of LPDDR5X with a 256-bit bus at 1067 MHz (8.5 Gbps effective), producing 273.2 GB/s. That is a bandwidth chasm of roughly thirty to one, and it explains why the B300 dominates sustained compute workloads even though its clock speeds are lower.

Platform details differ too. The B300 uses PCIe 6.0 x16 and offers no display outputs, consistent with a pure compute module. The GB10 uses PCIe 5.0 x16 and provides a single HDMI output. Both list N/A for DirectX, OpenGL, and Vulkan support. Both products are active, both succeed the Server Hopper line, and both point to Server Rubin as successor. The B300 went active on September 10, 2025, the GB10 on October 14, 2025.

Head-to-Head Benchmarks

The database holds one direct comparison, and it is decisive. In Geekbench OpenCL, the B300 SXM6 AC scored 369831 and the GB10 scored 120137, a delta of 207.8 percent in the B300's favor. The B300 wins the only contested benchmark, giving it a one-to-zero win record in the head-to-head data.

Context matters when reading that margin. The GB10's 120137 OpenCL result is not a weak score in absolute terms; it beats the Tesla V100 SXM2 16 GB and the RTX A5500 Mobile, and essentially matches the RTX 4000 SFF Ada Generation. The B300's 369831 is simply on another plane: it leads the B200 by 7 percent, and the B200 itself is one of the fastest accelerators recorded. The GB10 also holds a Geekbench Vulkan score of 114648, but the B300 has no recorded Vulkan run, so that result stands without a direct counterpoint.

The theoretical rates reinforce the benchmark picture. The B300 delivers 76.99 TFLOPS FP32 with FP16 running at a 1:1 ratio, plus a texture rate of 1202.9 GTexel/s. The GB10 delivers 29.71 TFLOPS FP32, also 1:1 with FP16, and a texture rate of 928.5 GTexel/s. Curiously, the pixel rate favors the GB10: 116.1 GPixel/s against the B300's 48.77 GPixel/s, a consequence of the GB10's 48 ROPs and higher boost clock versus the B300's 24 ROPs. For rasterization-bound output the GB10 is nominally faster, though neither product targets graphics workloads.

Specification Differences

The fields where these two diverge, based strictly on the recorded data:

• Chip: GB110 (B300) versus GB20B (GB10)
• Architecture: Blackwell Ultra versus Blackwell 2.0
• Transistors: 208,000 million for the B300; unknown for the GB10
• Die size: 1628 mm² versus 382 mm²
• Transistor density: 127.8M / mm² for the B300; not recorded for the GB10
• Boost clock: 2032 MHz versus 2418 MHz (both share a 1665 MHz base)
• Memory: 288 GB HBM3e on an 8192-bit bus at 8.19 TB/s versus 128 GB LPDDR5X on a 256-bit bus at 273.2 GB/s
• Memory clock: 2000 MHz (8 Gbps effective) versus 1067 MHz (8.5 Gbps effective)
• Shading units: 18944 versus 6144
• TMUs: 592 versus 384
• ROPs: 24 versus 48
• RT cores: none listed versus 48
• Tensor cores: 592 versus 384
• FP32: 76.99 TFLOPS versus 29.71 TFLOPS
• Pixel rate: 48.77 GPixel/s versus 116.1 GPixel/s
• Texture rate: 1202.9 GTexel/s versus 928.5 GTexel/s
• TDP: 1100 W versus 140 W
• Suggested PSU: 1500 W versus 300 W
• Slot form: SXM Module versus IGP
• Power connectors: none listed versus none
• Bus interface: PCIe 6.0 x16 versus PCIe 5.0 x16
• Display outputs: none versus 1x HDMI
• Dimensions: unrecorded for the B300; 150 mm length, 150 mm width, 51 mm height for the GB10
• Release date: September 10, 2025 versus October 14, 2025
• Launch MSRP: not recorded for the B300; 3,999 USD for the GB10

Shared specifications include the NVIDIA manufacturer, TSMC foundry, 5 nm process, Server Blackwell (Bxx) generation, Server Hopper predecessor, Server Rubin successor, active production status, and N/A API listings across DirectX, OpenGL, and Vulkan.

FAQ

Q: Which GPU is faster in benchmarks?

A: The B300 SXM6 AC. It won the only head-to-head test, Geekbench OpenCL, 369831 to 120137, a 207.8 percent margin. It also sits in the 100th percentile of all GPUs in the database versus the GB10's 95th percentile.

Q: How much more power does the B300 SXM6 AC need?

A: Its TDP is 1100 W against the GB10's 140 W. The database lists a suggested PSU of 1500 W for the B300 and 300 W for the GB10.

Q: How does the GB10 compare to other professional GPUs?

A: Its average score of 117393 places it 0.3 percent ahead of the NVIDIA RTX 4000 SFF Ada Generation, 1.3 percent behind the AMD Radeon PRO W7700, 2.6 percent ahead of the NVIDIA Tesla V100 SXM2 16 GB, and 3 percent ahead of the NVIDIA RTX A5500 Mobile.

Q: Which chip has more memory bandwidth?

A: The B300, by a wide margin: 8.19 TB/s from 288 GB of HBM3e on an 8192-bit bus, versus 273.2 GB/s from 128 GB of LPDDR5X on a 256-bit bus for the GB10.

Q: Do these GPUs support graphics APIs like DirectX or Vulkan?

A: Both list N/A for DirectX, OpenGL, and Vulkan in the database, consistent with their server-oriented positioning. The GB10 does offer a single HDMI output; the B300 has no display outputs.

Q: Which one has the higher clock speed?

A: The GB10, boosting to 2418 MHz versus the B300's 2032 MHz. Both share a 1665 MHz base clock. The B300 compensates with far more hardware: 18944 shading units and 592 tensor cores against the GB10's 6144 and 384 respectively.