AMD Radeon 780M vs NVIDIA B300 SXM6 AC Comparison

FAQ

Q: What is the performance difference between the AMD Radeon 780M and the NVIDIA B300 SXM6 AC in Geekbench OpenCL?

A: The NVIDIA B300 SXM6 AC scores 369,831, while the AMD Radeon 780M scores 18,602. The B300 leads by 95% in this test, meaning the 780M trails by that same margin.

Q: How do the two compare in terms of memory capacity and bandwidth?

A: The B300 SXM6 AC uses 288 GB of HBM3e memory with an 8192-bit bus and 8.19 TB/s bandwidth. The 780M relies on System Shared memory, with bandwidth listed as System Dependent and no dedicated capacity.

Q: Which product has a higher transistor count and die size?

A: The NVIDIA B300 SXM6 AC has 208,000 million transistors on a 1628 mm² die. The AMD Radeon 780M has 25,390 million transistors on a 178 mm² die.

Q: What is the TDP for each product?

A: The AMD Radeon 780M has a TDP of 15 W. The NVIDIA B300 SXM6 AC has a TDP of 1100 W, with a suggested PSU of 1500 W.

Q: What are the release dates for both products?

A: The AMD Radeon 780M was released on 2024-01-30. The NVIDIA B300 SXM6 AC was released on 2025-09-10.

Q: Which product has higher shading unit and TMU counts?

A: The NVIDIA B300 SXM6 AC has 18,944 shading units and 592 TMUs. The AMD Radeon 780M has 768 shading units and 48 TMUs.

Architecture Differences

The AMD Radeon 780M uses the Phoenix chip with RDNA 3.0 architecture, fabricated on a 4 nm process at TSMC with 25,390 million transistors on a 178 mm² die. It belongs to the Navi III IGP generation and is a successor to the Navi II IGP. The NVIDIA B300 SXM6 AC uses the GB110 chip with Blackwell Ultra architecture, fabricated on a 5 nm process at TSMC with 208,000 million transistors on a 1628 mm² die. It belongs to the Server Blackwell generation and is a successor to Server Hopper.

The 780M has 768 shading units, 48 TMUs, and 32 ROPs, along with 12 ray tracing cores. It does not list tensor cores. The B300 has 18,944 shading units, 592 TMUs, and only 24 ROPs. It lists 592 tensor cores but no ray tracing cores. The ROP disparity is notable: the 780M has more ROPs despite being far smaller, while the B300 compensates with massive shader and texture throughput.

Clock speeds differ substantially. The 780M runs at a base of 800 MHz and boosts to 2900 MHz, with system shared memory. The B300 runs at a base of 1665 MHz and boosts to 2032 MHz, with memory clocked at 2000 MHz (8 Gbps effective). The 780M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The B300 lists N/A for DirectX, OpenGL, and Vulkan, reflecting its server-oriented design with no display outputs.

The 780M uses a PCIe 4.0 x8 bus interface and is an IGP with motherboard-dependent display outputs and no power connectors. The B300 uses a PCIe 6.0 x16 interface, comes as an SXM Module, and has no display outputs. The 780M has a TDP of 15 W, while the B300 has a TDP of 1100 W with a suggested PSU of 1500 W.

Head-to-Head Benchmarks

The only recorded head-to-head benchmark is Geekbench OpenCL. The NVIDIA B300 SXM6 AC scores 369,831, and the AMD Radeon 780M scores 18,602. The delta is 95%, with the B300 as the winner. This is a 19.9x difference in raw score. The B300's score sits in the 100th percentile of all GPUs, while the 780M sits in the 61st percentile.

Looking at the 780M's other benchmarks, it scores 480 in 3DMark Steel Nomad DX12 and 33,683 in Geekbench Vulkan. These tests do not exist for the B300, so direct comparison is limited to the OpenCL result. The 780M's average benchmark score is 17,588, while the B300's average is 369,831.

The B300's nearest rivals in the database include the NVIDIA B200 with an average score of 345,482 and a delta of 7%, the NVIDIA H200 NVL at 334,891 with a delta of 10.4%, the AMD Instinct MI300X at 317,994 with a delta of 16.3%, and the NVIDIA L40S at 295,763 with a delta of 25%. The B300 leads all of these by significant margins.

The 780M's nearest rivals are much closer in performance. The AMD Radeon Pro 560 has an average score of 17,551 with a delta of 0.2%, the NVIDIA GeForce RTX 4060 scores 17,639 with a delta of -0.3%, the AMD Radeon HD 7790 scores 17,666 with a delta of -0.4%, and the AMD Radeon Pro 460 scores 17,509 with a delta of 0.5%. These deltas are within 0.5%, indicating the 780M sits in a tightly packed performance band.

The benchmark results confirm the B300 operates in a completely different performance class. Its OpenCL score is more than 20 times higher than the 780M's, and it ranks at the 100th percentile, while the 780M ranks at the 61st percentile.

Specification Differences

The two products differ in nearly every specification field. The 780M uses 4 nm process technology, while the B300 uses 5 nm. The 780M has 25,390 million transistors on a 178 mm² die, while the B300 has 208,000 million transistors on a 1628 mm² die. Transistor density is 142.6M per mm² for the 780M and 127.8M per mm² for the B300.

Clock speeds: the 780M has a base clock of 800 MHz and a boost clock of 2900 MHz. The B300 has a base clock of 1665 MHz and a boost clock of 2032 MHz. Memory clocks are System Shared for the 780M versus 2000 MHz (8 Gbps effective) for the B300.

Memory: the 780M uses System Shared memory with System Dependent bandwidth. The B300 uses 288 GB of HBM3e with an 8192-bit bus and 8.19 TB/s bandwidth.

Compute units: the 780M has 768 shading units, 48 TMUs, and 32 ROPs. The B300 has 18,944 shading units, 592 TMUs, and 24 ROPs. The 780M has 12 ray tracing cores and no tensor cores. The B300 has 592 tensor cores and no ray tracing cores.

Pixel and texture rates: the 780M delivers 92.80 GPixel/s and 139.2 GTexel/s. The B300 delivers 48.77 GPixel/s and 1,202.9 GTexel/s. FP32 performance is 8.909 TFLOPS for the 780M and 76.99 TFLOPS for the B300. FP16 is 8.909 TFLOPS (1:1) for the 780M and 76.99 TFLOPS (1:1) for the B300.

Power and form factor: the 780M has a TDP of 15 W, is an IGP, has no power connectors, and uses PCIe 4.0 x8. The B300 has a TDP of 1100 W, is an SXM Module, has a suggested PSU of 1500 W, and uses PCIe 6.0 x16. The 780M has motherboard-dependent display outputs, while the B300 has no outputs.

API support: the 780M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The B300 lists N/A for all three APIs.

Where Each One Wins

The NVIDIA B300 SXM6 AC wins the only direct benchmark comparison by a 95% margin in Geekbench OpenCL. It also wins on memory capacity, bandwidth, shading units, TMUs, tensor cores, FP32 and FP16 throughput, and texture rate. Its 100th percentile ranking places it at the top of the database. The B300 is designed for server workloads, evidenced by its SXM Module form factor, lack of display outputs, and PCIe 6.0 x16 interface.

The AMD Radeon 780M wins on ROP count, with 32 versus 24. It also has a higher pixel rate at 92.80 GPixel/s versus 48.77 GPixel/s. The 780M has a higher boost clock at 2900 MHz versus 2032 MHz. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the B300 supports none of these. The 780M's 15 W TDP contrasts sharply with the B300's 1100 W TDP, making it suitable for integrated graphics scenarios. Its 61st percentile ranking shows it sits near the middle of the database.

The 780M's 3DMark Steel Nomad DX12 score of 480 and Geekbench Vulkan score of 33,683 demonstrate capability in graphics-focused tests, though no comparable data exists for the B300. The 780M's nearest rivals are all within 0.5% of its average score, indicating it competes closely with the AMD Radeon Pro 560, NVIDIA GeForce RTX 4060, AMD Radeon HD 7790, and AMD Radeon Pro 460.

The B300's nearest rivals are all substantially behind it. The closest, the NVIDIA B200, trails by 7%, while the NVIDIA L40S trails by 25%. This shows the B300 holds a commanding lead even within its server-class peer group.

The Verdict

The data shows two products designed for entirely different purposes. The NVIDIA B300 SXM6 AC is a server accelerator with 288 GB of HBM3e memory, 8.19 TB/s bandwidth, and 76.99 TFLOPS of FP32 performance. It ranks in the 100th percentile of all GPUs and leads its nearest rival, the NVIDIA B200, by 7%. Its 369,831 Geekbench OpenCL score is 95% higher than the 780M's 18,602.

The AMD Radeon 780M is an integrated GPU with 15 W TDP, system shared memory, and 8.909 TFLOPS of FP32 performance. It ranks in the 61st percentile and sits within 0.5% of rivals like the AMD Radeon Pro 560, NVIDIA GeForce RTX 4060, AMD Radeon HD 7790, and AMD Radeon Pro 460. Its 3DMark Steel Nomad score of 480 and Vulkan score of 33,683 show it handles graphics workloads, but it cannot compete with the B300's raw compute.

The B300 wins in every major compute specification: shading units (18,944 vs 768), TMUs (592 vs 48), FP32 (76.99 vs 8.909 TFLOPS), and memory bandwidth (8.19 TB/s vs System Dependent). The 780M wins on ROPs (32 vs 24), pixel rate (92.80 vs 48.77 GPixel/s), boost clock (2900 vs 2032 MHz), and API support (DirectX 12 Ultimate, OpenGL 4.6, Vulkan 1.4 vs N/A).

The verdict is straightforward. For server-scale compute, the NVIDIA B300 SXM6 AC is the clear choice, with performance that places it at the top of the database. For integrated graphics in a low-power system, the AMD Radeon 780M is the relevant product, offering DirectX 12 Ultimate support and a 15 W TDP. The two never compete for the same use case, and the benchmark data reflects that separation.