AMD Radeon R7 M340 vs NVIDIA Quadro P400 Comparison

The Verdict

The benchmark data presents a clear, if narrow, picture: the AMD Radeon R7 M340 wins both recorded head-to-head tests against the NVIDIA Quadro P400. In Geekbench OpenCL, the AMD card scores 4932 against NVIDIA’s 4249, a 16.1% advantage. In Geekbench Vulkan, the margin shrinks dramatically: 5193 versus 5119, a 1.4% lead. The overall average benchmark score confirms the trend (5063 for AMD versus 4684 for NVIDIA), placing the R7 M340 at the 30th percentile of all GPUs, three points above the Quadro P400’s 27th percentile.

For buyers strictly following this data, the AMD Radeon R7 M340 is the choice when compute performance in OpenCL is the primary workload, as its 16.1% lead is substantial. The NVIDIA Quadro P400, however, remains competitive in Vulkan-based tasks, where the 1.4% gap is within normal run-to-run variance. The Quadro P400 offers a different set of non-compute advantages—a lower 30 W TDP, a single-slot form factor, and three mini-DisplayPort 1.4a outputs—that the data shows are entirely absent from the AMD card’s specification list. For professional environments prioritizing multi-display output and low power draw over raw compute, the Quadro P400’s feature set may outweigh its benchmark deficit. For pure compute throughput, the R7 M340 is the data-backed winner.

FAQ

Q: Which GPU has the higher average benchmark score?

A: The AMD Radeon R7 M340, with an average benchmark score of 5063, compared to the NVIDIA Quadro P400’s 4684. This places the AMD card at the 30th percentile of all GPUs, versus the Quadro P400’s 27th percentile.

Q: How large is the performance gap in the OpenCL test?

A: The AMD Radeon R7 M340 scores 4932, while the NVIDIA Quadro P400 scores 4249. This results in a 16.1% advantage for the AMD card, its largest winning margin in any recorded test.

Q: Is the Vulkan performance difference significant?

A: No. The AMD Radeon R7 M340 scores 5193, and the NVIDIA Quadro P400 scores 5119, a delta of only 1.4%. This is a narrow margin that suggests near-parity in Vulkan workloads.

Q: What are the nearest rivals to these two GPUs according to the data?

A: For the AMD Radeon R7 M340, the nearest rival is the AMD Radeon R7 240 with an identical average score of 5063 (0% delta). For the NVIDIA Quadro P400, the nearest rival is the AMD Radeon R8 M445DX, which scores 4727, a -0.9% delta relative to the Quadro’s 4684.

Q: Do the two GPUs have the same memory bandwidth?

A: No. The AMD Radeon R7 M340 has a memory bandwidth of 16.00 GB/s using 2 GB of DDR3 memory on a 64-bit bus. The NVIDIA Quadro P400 has double the bandwidth at 32.06 GB/s, using 2 GB of GDDR5 memory on the same 64-bit bus width.

Q: Which GPU supports more advanced DirectX features?

A: The NVIDIA Quadro P400 supports DirectX 12 (12_1), while the AMD Radeon R7 M340 supports DirectX 12 (12_0). The 12_1 feature level is higher, indicating support for additional DirectX 12 features.

Architecture Differences

The two GPUs come from different manufacturers and entirely different architectural lineages. The AMD Radeon R7 M340 is built on the GCN 3.0 architecture, using the Meso chip, and is part of the Gem System generation within the R7 M300 series. The NVIDIA Quadro P400 uses the Pascal architecture, built on the GP107 chip, and belongs to the Quadro Pascal (Px000) generation.

The manufacturing process differs significantly. AMD uses a 28 nm process at TSMC, while NVIDIA uses a 14 nm process at Samsung. This process advantage allows NVIDIA to pack more transistors into a similar die area: the Quadro P400 has 3,300 million transistors on a 132 mm² die, giving a transistor density of 25.0M / mm². The R7 M340 has 1,550 million transistors on a slightly smaller 125 mm² die, yielding a density of 12.4M / mm². The Pascal chip thus has over twice the transistor count, despite being only slightly larger physically.

The shader configuration differs in a notable way. The AMD card has 320 shading units, 20 texture mapping units (TMUs), and 8 render output units (ROPs). The NVIDIA card has fewer shading units (256) and fewer TMUs (16), but doubles the ROP count to 16. This ROP advantage is reflected in the pixel fillrate: the Quadro P400 achieves 20.03 GPixel/s, while the R7 M340 manages only 8.168 GPixel/s. The texture fillrates are nearly identical (20.42 GTexel/s for AMD versus 20.03 GTexel/s for NVIDIA), despite the AMD card having more TMUs, because the NVIDIA chip runs at higher clocks.

Compute capabilities show a mixed picture. The AMD Radeon R7 M340 delivers 653.4 GFLOPS of FP32 performance, slightly ahead of the Quadro P400’s 641.0 GFLOPS. However, the FP16 performance is radically different: the AMD card offers 653.4 GFLOPS at a 1:1 ratio with FP32, while the NVIDIA card offers only 10.02 GFLOPS at a 1:64 ratio. The AMD card is fully rate-limited for half-precision, whereas the Quadro P400 is not optimized for FP16 at all.

Specification Differences

The specification sheets for these two GPUs diverge on nearly every measurable field. The clock speeds are a primary differentiator: the AMD Radeon R7 M340 has a base clock of 943 MHz and a boost clock of 1021 MHz, while the NVIDIA Quadro P400 runs at a base of 1228 MHz and boosts to 1252 MHz. The memory clocks also differ: the AMD card runs its DDR3 memory at 1000 MHz (2 Gbps effective), while the NVIDIA card runs its GDDR5 memory at 1002 MHz (4 Gbps effective).

Memory bandwidth is a decisive difference. The R7 M340 delivers 16.00 GB/s, whereas the Quadro P400 delivers 32.06 GB/s—exactly double. Both have 2 GB of memory on a 64-bit bus, but the GDDR5 memory type on the NVIDIA card provides the bandwidth advantage.

The power and physical specifications are only provided for the NVIDIA card. The Quadro P400 has a TDP of 30 W, is single-slot, requires no power connectors, and suggests a 200 W PSU. It measures 150 mm (5.9 inches) in length and 69 mm (2.7 inches) in height. No equivalent figures are listed for the AMD Radeon R7 M340, indicating the data does not cover these fields for that card.

The bus interface differs: AMD uses PCIe 3.0 x8, while NVIDIA uses PCIe 3.0 x16, providing double the lane bandwidth for data transfer. Display outputs are only listed for the NVIDIA card: three mini-DisplayPort 1.4a connectors. The AMD card has no display output information in the data.

API support shows a split. Both support DirectX 12 and OpenGL 4.6. The AMD card supports DirectX 12 (12_0) and Vulkan 1.2.170; the NVIDIA card supports DirectX 12 (12_1) and Vulkan 1.4. The NVIDIA card supports a higher DirectX feature level and a newer Vulkan version.

Release dates and production status are similar: both are end-of-life products. The AMD card was released on 2015-05-04, and the NVIDIA card on 2017-02-06. Neither has a launch MSRP listed.

Head-to-Head Benchmarks

The head-to-head benchmark data contains two tests, and the AMD Radeon R7 M340 wins both. The first test, geekbench_opencl, shows the AMD card scoring 4932 against the NVIDIA Quadro P400’s 4249. The delta is 16.1%, which is a substantial margin in GPU compute terms. This is the clearest performance differentiator between the two cards.

The second test, geekbench_vulkan, is far closer. The AMD card scores 5193, and the NVIDIA card scores 5119. The delta is 1.4%—a margin small enough that it could be attributed to driver versions, thermal conditions, or test variance. For practical purposes, the Vulkan performance of these two cards is equivalent.

The average benchmark score (the mean of all recorded tests) reinforces the AMD lead: 5063 for the R7 M340 versus 4684 for the Quadro P400. The AMD card’s score is identical (0% delta) to its nearest rival, the AMD Radeon R7 240, and 0.6% above the AMD FirePro W4170M. The NVIDIA card’s average score is 0.6% above the AMD Radeon RX 9060 XT 16 GB and the AMD Radeon R5 M320, but -0.9% below the AMD Radeon R8 M445DX.

The percentile rankings tell a broader story. The R7 M340 sits at the 30th percentile of all GPUs, while the Quadro P400 sits at the 27th. Both are entry-level performers, but the AMD card holds a consistent, if modest, edge across the recorded benchmarks. The win count is 2 for the AMD card and 0 for the NVIDIA card, with no ties.

Where Each One Wins

The AMD Radeon R7 M340 wins decisively in OpenCL compute workloads. The 16.1% lead over the Quadro P400 in geekbench_opencl indicates that applications relying heavily on OpenCL—such as certain physics simulations, image processing pipelines, or cryptocurrency mining algorithms—will see measurably better performance on the AMD card. The R7 M340 also holds a slight edge in Vulkan, albeit a negligible 1.4%, meaning it is effectively the faster card in both recorded test scenarios.

The NVIDIA Quadro P400 wins in areas not captured by the compute benchmarks. The data shows a 30 W TDP for the Quadro P400, making it far more power-efficient in absolute terms, though no TDP figure is listed for the AMD card to compare against. The Quadro P400’s single-slot design and lack of power connectors indicate it is easier to install in constrained chassis. The three mini-DisplayPort 1.4a outputs provide multi-monitor capability that the AMD card’s specification sheet does not mention at all.

The memory bandwidth advantage is significant for the Quadro P400: 32.06 GB/s versus 16.00 GB/s. In workloads where memory bandwidth is the bottleneck—such as certain image filters, video processing, or large data transfers—the NVIDIA card would have a theoretical advantage, even though the compute benchmarks do not directly test this. The pixel fillrate also favors the NVIDIA card by a wide margin (20.03 GPixel/s versus 8.168 GPixel/s), suggesting better performance in rasterization-heavy tasks like 2D rendering or basic 3D viewport manipulation.

The transistor density difference (25.0M / mm² for NVIDIA versus 12.4M / mm² for AMD) indicates the Pascal chip is more modern and efficient, which aligns with its lower power draw and higher clock speeds. The newer Vulkan 1.4 support on the Quadro P400, versus 1.2.170 on the R7 M340, may also provide better forward compatibility with future software.

In summary, the data supports choosing the AMD Radeon R7 M340 for raw compute throughput, particularly in OpenCL. The NVIDIA Quadro P400 is the better choice when power efficiency, multi-display output, memory bandwidth, or pixel fillrate are the deciding factors. The two cards are otherwise closely matched, with the AMD card holding a slight overall edge in the recorded benchmarks.