AMD Radeon 8040S vs NVIDIA B300 SXM6 AC Comparison
AMD Radeon 8040S
B300 SXM6 AC
PERFORMANCE BENCHMARKS
Analysis: AMD Radeon 8040S vs NVIDIA B300 SXM6 AC
The Verdict
The AMD Radeon 8040S and NVIDIA B300 SXM6 AC occupy opposite ends of the GPU spectrum. The 8040S is an integrated graphics processor for mobile devices, built on the Strix Halo chip with RDNA 3.5 architecture. The B300 SXM6 AC is a server accelerator built on the GB110 chip with Blackwell Ultra architecture. The data shows no overlap in intended use cases, performance class, or physical design. The 8040S carries a 55 W TDP and an IGP slot width, while the B300 SXM6 AC carries a 1100 W TDP and an SXM Module slot width. The Radeon 8040S fits in portable devices with no power connectors and portable-device-dependent display outputs. The B300 SXM6 AC has no display outputs at all and requires a 1500 W suggested PSU. Benchmark results confirm the separation: the B300 scores 369831 in Geekbench OpenCL, ranking in the 100th percentile of all GPUs, while the 8040S scores 10578 in Passmark G3D, ranking in the 17th percentile. The Radeon 8040S is for thin-and-light systems that need basic DirectX 12 Ultimate graphics. The B300 SXM6 AC is for compute environments that prioritize raw FP32, FP16, and memory bandwidth.
FAQ
Q: Which GPU has the higher average benchmark score?
A: The NVIDIA B300 SXM6 AC has an average benchmark score of 369831, versus 2440 for the AMD Radeon 8040S. The B300 sits at the 100th percentile of all GPUs, while the 8040S sits at the 17th percentile.
Q: How much memory does each GPU use?
A: The B300 SXM6 AC has 288 GB of HBM3e memory on an 8192 bit bus with 8.19 TB/s bandwidth. The 8040S uses system shared memory, with system dependent bandwidth and no dedicated VRAM.
Q: What DirectX support does each GPU offer?
A: The AMD Radeon 8040S supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The NVIDIA B300 SXM6 AC lists DirectX as N/A, OpenGL as N/A, and Vulkan as N/A, indicating no consumer graphics API support.
Q: Which GPU has more shading units?
A: The NVIDIA B300 SXM6 AC has 18944 shading units. The AMD Radeon 8040S has 1024 shading units. The B300 also carries 592 tensor cores and 592 TMUs, while the 8040S has 64 TMUs, 32 ROPs, and 16 RT cores.
Q: What is the process node for each chip?
A: The AMD Radeon 8040S uses a 4 nm process at TSMC with a 308 mm² die. The NVIDIA B300 SXM6 AC uses a 5 nm process at TSMC with a 1628 mm² die and 208,000 million transistors.
Q: What are the closest rivals for each GPU in the database?
A: The 8040S sits near the NVIDIA GeForce 710M (0.3% ahead), Intel HD Graphics 610 (0.6% ahead), NVIDIA GeForce GT 710M (0.7% ahead), and AMD Radeon RX 7400 (1.1% behind). The B300 sits 7% ahead of the NVIDIA B200, 10.4% ahead of the NVIDIA H200 NVL, 16.3% ahead of the AMD Instinct MI300X, and 25% ahead of the NVIDIA L40S.
Architecture Differences
The AMD Radeon 8040S uses the Strix Halo chip with RDNA 3.5 architecture, placed in the Navi Mobile (RX 8000M) generation. The NVIDIA B300 SXM6 AC uses the GB110 chip with Blackwell Ultra architecture, placed in the Server Blackwell (Bxx) generation. The 8040S is built on TSMC's 4 nm process with a 308 mm² die. The B300 is built on TSMC's 5 nm process with a 1628 mm² die and 208,000 million transistors, yielding a transistor density of 127.8M per mm². The 8040S transistor count is unknown in the database. The 8040S uses a PCIe 5.0 x16 bus interface. The B300 uses a PCIe 6.0 x16 bus interface. The 8040S integrates 16 ray tracing cores, a feature absent from the B300's listed specifications. The B300 integrates 592 tensor cores, while the 8040S lists no tensor cores. The 8040S precedes from Polaris Mobile and has no successor listed. The B300 precedes from Server Hopper and lists Server Rubin as its successor. The B300's API support is entirely N/A across DirectX, OpenGL, and Vulkan, confirming its role as a compute-oriented accelerator rather than a graphics renderer. The 8040S supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, giving it full consumer graphics coverage.
Specification Differences
Clock behavior separates the two clearly. The 8040S runs a 1295 MHz base clock and a 2800 MHz boost clock. The B300 runs a 1665 MHz base clock and a 2032 MHz boost clock. Memory configurations are fundamentally different. The 8040S uses system shared memory with system dependent bandwidth. The B300 uses 288 GB of HBM3e on an 8192 bit bus with 8.19 TB/s bandwidth. Pixel rate favors the 8040S at 89.60 GPixel/s, while the B300 delivers 48.77 GPixel/s. Texture rate favors the B300 at 1,202.9 GTexel/s versus 179.2 GTexel/s for the 8040S. FP32 compute favors the B300 at 76.99 TFLOPS versus 5.734 TFLOPS. FP16 compute matches each GPU's FP32 figure at 1:1 ratio: 76.99 TFLOPS for the B300 and 5.734 TFLOPS for the 8040S. The 8040S has 1024 shading units, 64 TMUs, 32 ROPs, and 16 RT cores. The B300 has 18944 shading units, 592 TMUs, 24 ROPs, and 592 tensor cores. TDP differs by an order of magnitude: 55 W for the 8040S versus 1100 W for the B300. The 8040S uses no power connectors and lists an IGP slot width. The B300 is an SXM Module with a 1500 W suggested PSU. Display outputs are portable-device dependent on the 8040S; the B300 has no outputs. Release dates differ by roughly eight months: the 8040S launched on 2025-01-05 and the B300 on 2025-09-10. Both have active production status. Neither has a launch MSRP in the database.
Head-to-Head Benchmarks
The database records no direct head-to-head benchmark runs between the AMD Radeon 8040S and NVIDIA B300 SXM6 AC. The available benchmark suites are not comparable across the two products. The 8040S has Passmark tests for DirectX 9, 10, 11, 12, G2D, G3D, and GPU compute. Its best Passmark result is 10578 in G3D, followed by 5138 in GPU compute and 1052 in G2D. Its DirectX scores are 134 in DirectX 9, 80 in DirectX 11, 48 in DirectX 10, and 47 in DirectX 12. The B300 has a single Geekbench OpenCL score of 369831. In the absence of shared test workloads, the closest comparison comes from each GPU's nearest rivals in the database. The 8040S's average score of 2440 places it 0.3% above the NVIDIA GeForce 710M, 0.6% above the Intel HD Graphics 610, and 0.7% above the NVIDIA GeForce GT 710M, while sitting 1.1% below the AMD Radeon RX 7400. The B300's average score of 369831 places it 7% above the NVIDIA B200, 10.4% above the NVIDIA H200 NVL, 16.3% above the AMD Instinct MI300X, and 25% above the NVIDIA L40S. These percentile positions show the B300 at the absolute top of the database, while the 8040S sits near the low end, clustered with entry-level mobile and integrated parts. The benchmark gap is not marginal; the B300's single recorded score is roughly 35 times the 8040S's average score.
Where Each One Wins
The AMD Radeon 8040S wins in graphics feature coverage and power efficiency. It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, making it usable for consumer gaming and general graphics workloads. It includes 16 ray tracing cores, which the B300 does not list. Its pixel rate of 89.60 GPixel/s exceeds the B300's 48.77 GPixel/s, indicating stronger rasterization throughput per clock. Its 55 W TDP and lack of power connectors suit portable devices. Its display outputs are portable-device dependent, meaning it can drive screens in laptops or handhelds. Its 4 nm process node is smaller than the B300's 5 nm node. Its 64 TMUs and 32 ROPs provide a balanced configuration for integrated graphics. Its 2800 MHz boost clock is higher than the B300's 2032 MHz boost clock. The 8040S also offers PCIe 5.0 x16 connectivity, which is current for mobile platforms.
The NVIDIA B300 SXM6 AC wins in raw compute, memory capacity, and bandwidth. Its FP32 output of 76.99 TFLOPS is roughly 13.4 times the 8040S's 5.734 TFLOPS. Its FP16 output matches at 76.99 TFLOPS. Its texture rate of 1,202.9 GTexel/s is roughly 6.7 times the 8040S's 179.2 GTexel/s. Its 288 GB of HBM3e memory on an 8192 bit bus delivers 8.19 TB/s of bandwidth, while the 8040S relies on system shared memory with system dependent bandwidth. Its 18944 shading units and 592 tensor cores target large-scale parallel workloads. Its 592 TMUs support heavy texture processing. Its 1665 MHz base clock is higher than the 8040S's 1295 MHz base clock. Its PCIe 6.0 x16 interface is a generation ahead of the 8040S's PCIe 5.0 x16. Its 1628 mm² die and 208,000 million transistors represent a far larger silicon investment. Its 100th percentile ranking and 369831 average benchmark score place it among the top accelerators in the database, while its nearest rivals include the B200, H200 NVL, and MI300X. The B300 is designed for server environments with a 1500 W suggested PSU and no display outputs, meaning it does not render frames but processes compute workloads. The 8040S is designed for end-user devices where power draw, display connectivity, and API compatibility matter more than absolute FP32 throughput. Each GPU wins in the domain it was built for, and the database shows no meaningful overlap between those domains.