NVIDIA B300 SXM6 AC vs NVIDIA GeForce RTX 4080 Mobile Comparison

FAQ

Q: How much faster is the NVIDIA B300 SXM6 AC than the RTX 4080 Mobile in the recorded OpenCL benchmark?

A: The B300 SXM6 AC scores 369,831 in Geekbench OpenCL, which is 131.8% higher than the RTX 4080 Mobile's 159,575. The database records a single head-to-head benchmark, and the B300 wins it outright.

Q: What is the average benchmark score for each GPU, and how does that compare to their nearest rivals?

A: The B300 SXM6 AC has an average score of 369,831, placing it at the 100th percentile among all GPUs. Its nearest rival, the NVIDIA B200, scores 345,482 (7% lower). The RTX 4080 Mobile averages 38,135, sitting at the 81st percentile, with the GeForce MX570 close behind at 38,299 (0.4% lower).

Q: Which GPU has more memory, and what type does each use?

A: The B300 SXM6 AC uses 288 GB of HBM3e on an 8192-bit bus, delivering 8.19 TB/s of bandwidth. The RTX 4080 Mobile has 12 GB of GDDR6 on a 192-bit bus, providing 432.0 GB/s. The memory capacity difference is substantial, but bandwidth also favors the server part by a wide margin.

Q: What are the power requirements for each card?

A: The B300 SXM6 AC has a TDP of 1100 W and a suggested PSU of 1500 W. The RTX 4080 Mobile has a TDP of 110 W and lists no suggested PSU, as it is an integrated graphics processor for laptops. The B300's power draw is ten times higher.

Q: Do both GPUs support the same APIs?

A: No. The RTX 4080 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The B300 SXM6 AC lists N/A for DirectX, OpenGL, and Vulkan, reflecting its server-oriented design with no display outputs.

Q: What is the release date and production status for each product?

A: The B300 SXM6 AC was released on September 10, 2025, and is listed as Active. The RTX 4080 Mobile was released on January 2, 2023, and is also Active. Both are current products in the database.

The Verdict

The data draws a clear line between two different product categories. The NVIDIA B300 SXM6 AC is a server accelerator built for maximum compute throughput, while the GeForce RTX 4080 Mobile is a laptop GPU designed for portable graphics. The B300 SXM6 AC dominates the single recorded OpenCL test with 369,831 points, a 131.8% advantage over the RTX 4080 Mobile's 159,575. It also holds the 100th percentile ranking among all GPUs, meaning no recorded part scores higher.

The RTX 4080 Mobile, by contrast, sits at the 81st percentile with an average score of 38,135. Its nearest rivals in the database are the GeForce MX570 (38,299, 0.4% lower) and the GeForce RTX 5080 Mobile (38,349, 0.6% lower), indicating that the 4080 Mobile is competitive within its laptop segment but not exceptional. The B300 SXM6 AC's nearest rivals are the B200 (345,482, 7% lower), H200 NVL (334,891, 10.4% lower), and AMD Instinct MI300X (317,994, 16.3% lower), showing it leads even the most powerful accelerators.

For buyers, the choice depends entirely on use case. The B300 SXM6 AC is the only option for workloads requiring massive memory (288 GB) and extreme FP32 throughput (76.99 TFLOPS). The RTX 4080 Mobile is the only option for portable systems, with a 110 W TDP and support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The B300 has no display outputs and no API support, making it unsuitable for consumer graphics. The RTX 4080 Mobile, on the other hand, lacks the compute density and memory capacity for enterprise-scale AI or scientific workloads. The data does not present them as competitors; it presents them as complementary tools for different domains.

Head-to-Head Benchmarks

The database records one direct comparison: Geekbench OpenCL. The B300 SXM6 AC scores 369,831, while the RTX 4080 Mobile scores 159,575. The delta is 131.8%, meaning the B300 more than doubles the laptop GPU's output. This is the only head-to-head test available, so the verdict is unambiguous: the server part wins the single measurable contest.

Beyond that single test, the average benchmark scores tell a similar story. The B300's average of 369,831 equals its OpenCL score, as that is its only recorded benchmark. The RTX 4080 Mobile's average of 38,135 is pulled down by its many Passmark results, which include low scores like 157 in DirectX 10 and 96 in DirectX 12. The B300 has no recorded Passmark or Vulkan scores, so cross-test comparisons are impossible. The OpenCL result is the only apples-to-apples data point, and it favors the B300 decisively.

The RTX 4080 Mobile does show strength in its own segment. Its Passmark G3D score of 24,926 and GPU compute score of 11,191 indicate solid performance for a mobile part. But these numbers are far below the B300's OpenCL result, and the database offers no direct comparison for these tests. The B300's nearest rival, the B200, scores 345,482 on average, 7% lower. The RTX 4080 Mobile's nearest rival, the MX570, scores 38,299, just 0.4% lower. The B300 leads its peers by a wider margin than the RTX 4080 Mobile leads its own.

Specification Differences

The two GPUs differ in nearly every measurable specification. The B300 SXM6 AC uses the GB110 chip with 208,000 million transistors on a 1628 mm² die. The RTX 4080 Mobile uses the AD104 chip with 35,800 million transistors on a 294 mm² die. Both are built on TSMC's 5 nm process, but the B300 has a transistor density of 127.8 million per mm², slightly higher than the RTX 4080 Mobile's 121.8 million per mm².

Memory specifications diverge sharply. The B300 has 288 GB of HBM3e on an 8192-bit bus with 8.19 TB/s bandwidth. The RTX 4080 Mobile has 12 GB of GDDR6 on a 192-bit bus with 432.0 GB/s. The B300's memory clock is 2000 MHz (8 Gbps effective), while the RTX 4080 Mobile runs at 2250 MHz (18 Gbps effective). Despite the slower clock, the B300's massive bus width gives it nearly 19 times the bandwidth.

Compute resources also differ. The B300 has 18,944 shading units, 592 TMUs, and 24 ROPs. The RTX 4080 Mobile has 7,424 shading units, 232 TMUs, and 80 ROPs. The B300 has 592 tensor cores but no listed RT cores; the RTX 4080 Mobile has 232 tensor cores and 58 RT cores. The B300's FP32 performance is 76.99 TFLOPS, and its FP16 is also 76.99 TFLOPS (1:1). The RTX 4080 Mobile delivers 24.72 TFLOPS in both FP32 and FP16 (1:1). Pixel rate favors the RTX 4080 Mobile at 133.2 GPixel/s versus 48.77 GPixel/s, while texture rate favors the B300 at 1,202.9 GTexel/s versus 386.3 GTexel/s.

Clock speeds show the B300 running at 1665 MHz base and 2032 MHz boost. The RTX 4080 Mobile runs at 1290 MHz base and 1665 MHz boost. The B300's TDP is 1100 W with a 1500 W suggested PSU, while the RTX 4080 Mobile's TDP is 110 W with no suggested PSU. The B300 uses a SXM Module slot and PCIe 6.0 x16; the RTX 4080 Mobile is an IGP with PCIe 4.0 x16. The B300 has no display outputs; the RTX 4080 Mobile's outputs are portable device dependent.

Architecture Differences

The B300 SXM6 AC is built on the Blackwell Ultra architecture, specifically the GB110 chip, and belongs to the Server Blackwell (Bxx) generation. The RTX 4080 Mobile uses the Ada Lovelace architecture with the AD104 chip, part of the GeForce 40 Mobile series. Both use TSMC's 5 nm process, but the underlying designs target different workloads.

The B300's Blackwell Ultra architecture emphasizes raw compute density and memory throughput. Its 18,944 shading units and 592 tensor cores are organized for parallel processing at scale. The 288 GB HBM3e pool with 8.19 TB/s bandwidth is designed for large model inference and training datasets. The lack of RT cores and display outputs confirms a compute-only orientation. The B300's predecessor is Server Hopper, and its successor is Server Rubin, placing it in a direct line of enterprise accelerators.

The RTX 4080 Mobile's Ada Lovelace architecture is a consumer-focused design with 58 RT cores for ray tracing and support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. Its 12 GB GDDR6 memory and 192-bit bus are suited for gaming and creative workloads on laptops. The 80 ROPs give it a higher pixel rate (133.2 GPixel/s) than the B300 (48.77 GPixel/s), which is counterintuitive given the B300's overall compute advantage. This reflects the RTX 4080 Mobile's role in rasterization-heavy tasks. Its predecessor is GeForce 30 Mobile, and its successor is GeForce 50 Mobile.

The transistor counts reveal the scale difference: the B300 packs 208,000 million transistors, nearly six times the RTX 4080 Mobile's 35,800 million. Die size is 1628 mm² versus 294 mm², a 5.5x difference. The B300's transistor density is 127.8M per mm², slightly ahead of the RTX 4080 Mobile's 121.8M per mm², indicating a more efficient packing of logic on the server chip. The B300's FP32 and FP16 both hit 76.99 TFLOPS with a 1:1 ratio, while the RTX 4080 Mobile matches its own FP32 and FP16 at 24.72 TFLOPS. Neither part shows a half-precision advantage, which is notable for AI workloads that often rely on FP16.

The B300's memory clock is 2000 MHz with 8 Gbps effective, while the RTX 4080 Mobile runs at 2250 MHz with 18 Gbps effective. The RTX 4080 Mobile's faster memory clock and GDDR6 type are typical for consumer parts, but the B300's HBM3e and 8192-bit bus deliver vastly higher bandwidth. The B300's texture rate of 1,202.9 GTexel/s is more than three times the RTX 4080 Mobile's 386.3 GTexel/s, reinforcing its compute-heavy profile. The RTX 4080 Mobile's higher pixel rate and ROP count are the only metrics where it leads, underscoring its graphics-oriented design.