NVIDIA B300 SXM6 AC vs NVIDIA RTX 4500 Ada Generation Comparison

The NVIDIA B300 SXM6 AC and the NVIDIA RTX 4500 Ada Generation occupy opposite ends of the accelerator spectrum, and the benchmark data reflects a dramatic performance gulf. In the single head-to-head benchmark available, the B300 SXM6 AC delivers a Geekbench OpenCL score of 369,831, which is 130% higher than the RTX 4500 Ada's 160,786. This is not a marginal victory but a dominant, multi-generational leap in raw compute throughput, driven by fundamentally different design goals.

Head-to-Head Benchmarks

The only directly comparable benchmark result is Geekbench OpenCL, and it tells a stark story. The B300 SXM6 AC scores 369,831, while the RTX 4500 Ada Generation scores 160,786. The delta is 130%, meaning the B300 delivers more than twice the OpenCL performance. This aligns with their positional rankings: the B300 sits at the 100th percentile of all GPUs, while the RTX 4500 sits at the 97th percentile. The gap between these percentile ranks is notable—the B300 is at the absolute top of the database, whereas the RTX 4500, while strong, is still within striking distance of other workstation-class cards.

Looking at the B300's nearest rivals, its 369,831 average score is 7% ahead of the NVIDIA B200 (345,482), 10.4% ahead of the NVIDIA H200 NVL (334,891), 16.3% ahead of the AMD Instinct MI300X (317,994), and 25% ahead of the NVIDIA L40S (295,763). These deltas show that even among elite server accelerators, the B300 holds a clear edge. For the RTX 4500 Ada, its average benchmark score of 166,094 places it narrowly ahead of the NVIDIA RTX A5500 (165,217) by 0.5% and the AMD Radeon PRO W7800 (164,894) by 0.7%. It trails the AMD Radeon Pro W6900X (168,574) by 1.5% but beats the NVIDIA A100 PCIe 40 GB (162,504) by 2.2%. The RTX 4500's wins are razor-thin, indicating a crowded mid-range workstation field, whereas the B300's wins are decisive.

Architecture Differences

The architectural divide is immense. The B300 SXM6 AC uses the GB110 chip built on Blackwell Ultra architecture, fabricated on a 5 nm process at TSMC. It packs 208,000 million transistors on a 1628 mm² die, yielding a transistor density of 127.8M per mm². In contrast, the RTX 4500 Ada uses the AD103 chip on Ada Lovelace architecture, also on a 5 nm process at TSMC, but with only 45,900 million transistors on a 379 mm² die, for a density of 121.1M per mm². The B300 has over 4.5 times the transistor count and over 4.3 times the die area.

Memory systems are wholly different. The B300 features 288 GB of HBM3e on an 8192-bit bus, delivering 8.19 TB/s of bandwidth. The RTX 4500 has 24 GB of GDDR6 on a 192-bit bus, providing 432.0 GB/s. That is a 19x difference in memory capacity and a roughly 19x difference in bandwidth. The B300's memory clock is 2000 MHz (8 Gbps effective), while the RTX 4500 runs at 2250 MHz (18 Gbps effective), but the B300's vastly wider bus dwarfs the RTX 4500's advantage in clock speed.

Compute resources follow the same pattern. The B300 has 18,944 shading units, 592 TMUs, and 592 tensor cores, but only 24 ROPs. The RTX 4500 has 7,680 shading units, 240 TMUs, 240 tensor cores, and 80 ROPs. The B300's FP32 throughput is 76.99 TFLOPS, nearly double the RTX 4500's 39.63 TFLOPS; both have 1:1 FP16 ratios, so FP16 performance mirrors these figures. Pixel rate favors the RTX 4500 at 206.4 GPixel/s versus 48.77 GPixel/s for the B300, but texture rate favors the B300 at 1,202.9 GTexel/s versus 619.2 GTexel/s. The B300 also has no RT cores listed, while the RTX 4500 has 60.

Where Each One Wins

The B300 SXM6 AC wins decisively in raw compute and memory-bound workloads. Its 130% lead in OpenCL, 288 GB memory capacity, and 8.19 TB/s bandwidth make it suited for massive AI training datasets, large-scale scientific simulations, and high-throughput inference. Its 76.99 TFLOPS FP32 and FP16 performance positions it for dense matrix operations. The 100th percentile ranking confirms it is the top performer in the database, outpacing the B200 by 7% and H200 NVL by 10.4%.

The RTX 4500 Ada Generation wins in pixel throughput and workstation-specific features. Its 206.4 GPixel/s pixel rate is more than 4 times the B300's 48.77 GPixel/s, which matters for graphics rendering, video processing, and display output. It has 4x DisplayPort 1.4a outputs, whereas the B300 has no display outputs. The RTX 4500 also supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the B300 lists N/A for all APIs. Its 60 RT cores enable hardware ray tracing, which the B300 lacks. With a 210 W TDP and dual-slot form factor, it fits in conventional workstations, unlike the B300's 1100 W SXM module.

Specification Differences

The two cards differ on nearly every specification field. The B300 uses a GB110 chip (Blackwell Ultra) versus the RTX 4500's AD103 (Ada Lovelace). Transistors are 208,000 million versus 45,900 million. Die size is 1628 mm² versus 379 mm². Base clock is 1665 MHz versus 2070 MHz; boost clock is 2032 MHz versus 2580 MHz. Memory size is 288 GB versus 24 GB; type is HBM3e versus GDDR6; bus width is 8192 bit versus 192 bit; bandwidth is 8.19 TB/s versus 432.0 GB/s. Shading units are 18,944 versus 7,680; TMUs are 592 versus 240; ROPs are 24 versus 80; tensor cores are 592 versus 240. Pixel rate is 48.77 GPixel/s versus 206.4 GPixel/s; texture rate is 1,202.9 GTexel/s versus 619.2 GTexel/s; FP32 is 76.99 TFLOPS versus 39.63 TFLOPS; FP16 is 76.99 TFLOPS versus 39.63 TFLOPS. TDP is 1100 W versus 210 W; slot width is SXM Module versus Dual-slot; suggested PSU is 1500 W versus 550 W; bus interface is PCIe 6.0 x16 versus PCIe 4.0 x16. Display outputs: none versus 4x DisplayPort 1.4a. The RTX 4500 has dimensions of 245 mm (9.6 inches) in length and 112 mm (4.4 inches) in height; the B300 has no listed dimensions. Release dates differ: 2025-09-10 for the B300 versus 2023-08-08 for the RTX 4500.

FAQ

Q: How much faster is the NVIDIA B300 SXM6 AC in OpenCL than the RTX 4500 Ada Generation?

A: The B300 scores 369,831 versus 160,786, a 130% delta in its favor.

Q: Which card has more memory bandwidth?

A: The B300 features 8.19 TB/s from 288 GB of HBM3e on an 8192-bit bus; the RTX 4500 offers 432.0 GB/s from 24 GB of GDDR6 on a 192-bit bus.

Q: Does the RTX 4500 support ray tracing?

A: Yes, it has 60 RT cores; the B300 lists no RT cores.

Q: What is the power draw difference?

A: The B300 has a 1100 W TDP with a 1500 W suggested PSU, while the RTX 4500 has a 210 W TDP with a 550 W suggested PSU.

Q: Which card has display outputs?

A: The RTX 4500 has 4x DisplayPort 1.4a; the B300 has no outputs.

Q: How does each card rank among all GPUs?

A: The B300 is at the 100th percentile; the RTX 4500 is at the 97th percentile.

The Verdict

Choose the NVIDIA B300 SXM6 AC if your workloads demand maximum compute and memory capacity. It is 130% faster in OpenCL, holds a 100th percentile ranking, and leads its nearest rival (B200) by 7% and the H200 NVL by 10.4%. Its 288 GB memory and 8.19 TB/s bandwidth are unmatched, making it the clear choice for large-scale AI and scientific computing. The 1100 W TDP and SXM module form factor indicate a data-center deployment, not a desktop.

Choose the NVIDIA RTX 4500 Ada Generation if you need a workstation card with graphics capabilities. It offers 4x DisplayPort outputs, 60 RT cores, and full API support (DirectX 12 Ultimate, OpenGL 4.6, Vulkan 1.4). Its pixel rate of 206.4 GPixel/s is over 4 times higher than the B300's, making it suitable for rendering and visualization. It consumes only 210 W and fits in a dual-slot PCIe 4.0 x16 configuration. While its compute is far behind the B300, its nearest rivals (RTX A5500 at 0.5% delta, Radeon PRO W7800 at 0.7%) show it is competitive within its class, though it trails the Radeon Pro W6900X by 1.5%.

The data is unambiguous: the B300 is a specialized server accelerator for peak compute, while the RTX 4500 is a general-purpose workstation GPU for visual and graphics-heavy tasks. There is no overlap in use cases, and the benchmark results confirm they serve entirely different markets.