NVIDIA B300 vs NVIDIA H20 Comparison

FAQ

Q: What are the core specifications of the NVIDIA B300?

A: The NVIDIA B300 uses the GB110 chip on a 5 nm process from TSMC, with 104,000 million transistors. It has 18,944 shading units, 592 TMUs, 24 ROPs, and 592 tensor cores. Its base clock is 1665 MHz with a boost clock of 2032 MHz, and it carries 144 GB of HBM3e memory on a 4096-bit bus, delivering 4.10 TB/s of bandwidth.

Q: What are the core specifications of the NVIDIA H20?

A: The NVIDIA H20 uses the GH100 chip on a 5 nm process from TSMC, with 80,000 million transistors and a die size of 814 mm². It has 9,984 shading units, 312 TMUs, 24 ROPs, and 312 tensor cores. Its base clock is 1830 MHz with a boost clock of 1980 MHz, and it carries 96 GB of HBM3 memory on a 6144-bit bus, delivering 4.03 TB/s of bandwidth.

Q: How do the memory capacities and bandwidths compare?

A: The B300 has 144 GB of HBM3e, which is 48 GB more than the H20's 96 GB of HBM3. In bandwidth, the B300 reaches 4.10 TB/s versus the H20's 4.03 TB/s, a narrow gap of 0.07 TB/s despite the larger capacity and newer memory type.

Q: What are the power requirements for each card?

A: The B300 has a TDP of 1400 W and a suggested PSU of 1800 W. The H20 has a TDP of 500 W and a suggested PSU of 900 W. The B300 consumes 900 W more and requires a PSU rated 900 W higher.

Q: When were these cards released, and what are their production statuses?

A: The B300 was released on September 10, 2025, and the H20 was released on January 31, 2024. Both are listed as Active in production status.

Q: What are the FP16 and FP32 compute figures for each?

A: The B300 delivers 76.99 TFLOPS in FP32 and 1,231.8 TFLOPS in FP16 (16:1 ratio). The H20 delivers 39.54 TFLOPS in FP32 and 79.07 TFLOPS in FP16 (2:1 ratio). The B300 is roughly 1.95 times faster in FP32 and about 15.6 times faster in FP16.

Where Each One Wins

The NVIDIA B300 and NVIDIA H20 occupy distinct positions in the server GPU lineup, and the recorded data indicates clear strengths for each depending on workload type.

The B300 dominates in raw compute throughput. Its FP32 figure of 76.99 TFLOPS is nearly double the H20's 39.54 TFLOPS, a 94.7% advantage. In FP16, the B300's 1,231.8 TFLOPS dwarfs the H20's 79.07 TFLOPS, a 15.6-fold gap. This makes the B300 the preferred choice for dense floating-point workloads, large-scale matrix operations, and any task that can leverage its massive tensor core count of 592 versus the H20's 312. The B300 also holds a memory capacity advantage with 144 GB versus 96 GB, allowing larger datasets to reside on-card.

The H20 wins on efficiency and density. Its 500 W TDP is less than half the B300's 1400 W, and its suggested PSU of 900 W is exactly half the B300's 1800 W. For deployments where power delivery is constrained or where multiple accelerators must fit within a fixed power envelope, the H20 delivers a substantial portion of the B300's memory bandwidth (4.03 TB/s versus 4.10 TB/s, a 1.7% deficit) while consuming 64.3% less power. The H20 also has a higher base clock (1830 MHz versus 1665 MHz), though its boost clock is lower (1980 MHz versus 2032 MHz).

The B300 uses a wider memory bus in terms of capacity per pin, with 144 GB over 4096 bits, while the H20 uses a 6144-bit bus with 96 GB. The H20's wider bus explains its near-parity bandwidth despite slower memory clocks (1313 MHz versus 2000 MHz). For applications that are bandwidth-bound rather than capacity-bound, the two are nearly equivalent; for capacity-bound workloads, the B300 wins outright.

Pixel rates are close: 48.77 GPixel/s for the B300 versus 47.52 GPixel/s for the H20, a 2.6% edge for the B300. Texture rate favors the B300 heavily at 1,202.9 GTexel/s versus 617.8 GTexel/s, a 94.7% advantage matching the FP32 ratio. The B300 also holds a transistor count lead, 104,000 million versus 80,000 million, a 30% difference.

Architecture Differences

The B300 is built on the Blackwell Ultra architecture, while the H20 uses the Hopper architecture. These are two distinct generations, with the B300 belonging to the Server Blackwell (Bxx) generation and the H20 to the Server Hopper (Hxx) generation. The B300's chip is the GB110, whereas the H20 uses the GH100.

Both use a 5 nm process from TSMC, so the node is identical. The B300 packs 104,000 million transistors, compared to the H20's 80,000 million, a 24,000 million transistor increase. The H20 has a published die size of 814 mm², giving a transistor density of 98.3M per mm²; the B300's die size is not recorded in the database.

The B300 uses HBM3e memory, while the H20 uses HBM3. This is a generational memory upgrade, reflected in the B300's higher memory clock of 2000 MHz (8 Gbps effective) versus the H20's 1313 MHz (5.3 Gbps effective). Despite the H20's wider bus (6144 bit versus 4096 bit), the B300's faster memory clock and newer type yield slightly higher bandwidth.

Compute ratios differ sharply. The B300's FP16 figure is listed at a 16:1 ratio, indicating a highly specialized tensor path, while the H20's FP16 is at a 2:1 ratio, a more conventional arrangement. This explains the enormous FP16 gap: 1,231.8 TFLOPS versus 79.07 TFLOPS. The B300's architecture clearly dedicates far more silicon area to tensor operations relative to standard FP32.

The B300 has 18,944 shading units and 592 TMUs, versus 9,984 shading units and 312 TMUs on the H20. Both cards have 24 ROPs, an unusual parity that suggests the ROP count is not a bottleneck for these server accelerators. Tensor cores scale with TMUs: 592 on the B300 and 312 on the H20, exactly double on each front.

Neither card exposes a DirectX, OpenGL, or Vulkan API in the database, and both have no display outputs. These are compute-focused accelerators without graphics features. The H20 lists its APIs as N/A, while the B300 has null values, but functionally both lack graphics support.

Specification Differences

The recorded specifications show several fields where the two cards differ. The chip designations are GB110 for the B300 and GH100 for the H20. Architecture names differ: Blackwell Ultra versus Hopper. Generations are Server Blackwell (Bxx) versus Server Hopper (Hxx).

Transistor counts are 104,000 million for the B300 and 80,000 million for the H20. The H20 has a die size of 814 mm² and a transistor density of 98.3M per mm²; the B300 has neither recorded.

Clock speeds differ across the board. Base clocks are 1665 MHz (B300) and 1830 MHz (H20). Boost clocks are 2032 MHz (B300) and 1980 MHz (H20). Memory clocks are 2000 MHz with 8 Gbps effective (B300) and 1313 MHz with 5.3 Gbps effective (H20).

Memory configurations diverge: 144 GB HBM3e on a 4096-bit bus for the B300, versus 96 GB HBM3 on a 6144-bit bus for the H20. Bandwidth is 4.10 TB/s versus 4.03 TB/s.

Shading units are 18,944 versus 9,984. TMUs are 592 versus 312. ROPs are identical at 24. Tensor cores are 592 versus 312.

Pixel rates are 48.77 GPixel/s versus 47.52 GPixel/s. Texture rates are 1,202.9 GTexel/s versus 617.8 GTexel/s. FP32 is 76.99 TFLOPS versus 39.54 TFLOPS. FP16 is 1,231.8 TFLOPS (16:1) versus 79.07 TFLOPS (2:1).

TDP is 1400 W versus 500 W. Suggested PSU is 1800 W versus 900 W. Both use SXM Module slot width and PCIe 5.0 x16 bus interface. Release dates are September 10, 2025 for the B300 and January 31, 2024 for the H20. Predecessors are Server Hopper (B300) and Server Ada (H20). Successors are Server Rubin (B300) and Server Blackwell (H20).

Head-to-Head Benchmarks

The database contains no scored benchmark runs for either card, with both showing an average benchmark score of 0 and a percentile rank of 50 among all GPUs. The head-to-head benchmark array is empty, and each card has no listed nearest rivals. This means direct performance comparisons must be derived from the recorded specification data rather than executed workloads.

The largest advantage for the B300 appears in FP16 compute. Its 1,231.8 TFLOPS is 15.6 times the H20's 79.07 TFLOPS. This is not an incremental gain but a step change in capability, driven by the 16:1 ratio versus the 2:1 ratio. For any workload that uses FP16 tensor operations, the B300 processes roughly 15.6 times as many operations per second.

FP32 shows a similarly lopsided comparison. The B300's 76.99 TFLOPS is 1.95 times the H20's 39.54 TFLOPS, a 94.7% advantage. This is a near-doubling of raw single-precision throughput, which matters for workloads that cannot be expressed as tensor operations.

Texture rate follows the same pattern: 1,202.9 GTexel/s versus 617.8 GTexel/s, again a 94.7% advantage for the B300. This aligns exactly with the FP32 ratio, confirming that TMU scaling drives both figures.

Pixel rate is nearly identical: 48.77 GPixel/s versus 47.52 GPixel/s, a 2.6% edge for the B300. Both cards have 24 ROPs, so the small difference comes from clock speed, with the B300's 2032 MHz boost versus the H20's 1980 MHz boost.

Memory bandwidth shows the closest margin. The B300's 4.10 TB/s versus the H20's 4.03 TB/s is a 1.7% difference. The H20 compensates for its slower HBM3 memory with a wider 6144-bit bus, nearly matching the B300's HBM3e on a 4096-bit bus. For bandwidth-sensitive workloads, the two cards are effectively equivalent.

Memory capacity is a decisive B300 win. 144 GB versus 96 GB is a 50% advantage. The B300 can hold 48 GB more data on-card, reducing the need for host-side data movement in large model inference or training scenarios.

Power efficiency favors the H20 decisively. At 500 W versus 1400 W, the H20 consumes 64.3% less power. Per watt of FP32 throughput, the H20 delivers 0.079 TFLOPS per watt versus the B300's 0.055 TFLOPS per watt, a 43.7% efficiency advantage for the H20. Per watt of FP16 throughput, the H20 delivers 0.158 TFLOPS per watt versus the B300's 0.880 TFLOPS per watt, which reverses dramatically in favor of the B300 due to its tensor-heavy design.

The B300's transistor count advantage of 24,000 million (30% more) does not translate into a proportional performance gain in FP32, where it leads by 94.7%, but it does in FP16, where the 16:1 ratio unlocks a disproportionate lead. The H20's higher transistor density, at 98.3M per mm² across 814 mm², shows a more conventional layout compared to the B300's uncounted die size.

Clock behavior differs in an interesting way. The H20 has a higher base clock at 1830 MHz versus 1665 MHz, a 9.9% lead at idle-to-moderate loads. The B300 has a higher boost clock at 2032 MHz versus 1980 MHz, a 2.6% lead under sustained load. This suggests the H20 is tuned for consistent operation at moderate power, while the B300 is designed to push higher clock rates when power delivery allows.

Release timing shows the B300 as the newer product by over 19 months, with the H20 arriving January 31, 2024 and the B300 on September 10, 2025. The B300's successor is Server Rubin, while the H20's successor is Server Blackwell, meaning the B300 is one generation ahead of the H20 in the product stack.