AMD Radeon RX 6400 vs Intel Iris Pro Graphics P580 Comparison

Head-to-Head Benchmarks

The database records two direct benchmark comparisons between the Intel Iris Pro Graphics P580 and the AMD Radeon RX 6400, and in both tests the AMD part dominates by a wide margin. Starting with Geekbench OpenCL, the Intel integrated GPU posts a score of 9,082, while the AMD discrete card reaches 32,011. That is a delta of 71.6% in favor of the RX 6400, meaning the AMD card delivers roughly three and a half times the raw compute throughput in this workload. The OpenCL test stresses general-purpose GPU computation, so the gap reflects fundamental differences in shading capacity, memory bandwidth, and architecture efficiency rather than any driver quirk.

The second recorded test, Geekbench Vulkan, shows a similar pattern. The Intel P580 scores 5,258, and the RX 6400 scores 16,372. The delta here is 67.9% in favor of AMD. Vulkan is a low-level graphics API that rewards efficient command processing and high fill rates, both of which the Navi 24 chip handles far better than the Skylake GT4e integrated solution. The Intel part's 9 ROPS and 72 TMUs look respectable on paper for an IGP, but the RX 6400's 32 ROPS and 48 TMUs, combined with a much higher boost clock, produce a dramatically higher pixel rate of 74.27 GPixel/s versus 9.00 GPixel/s.

It is importantly the Intel part's average benchmark score across all recorded tests is 7,170, while the AMD card's average is 6,001. This seems contradictory given the head-to-head results, but the averages include different test suites. The Intel GPU's percentile rank is 39 against all GPUs in the database, while the RX 6400 sits at the 35th percentile. The RX 6400's average is dragged down by several low-scoring Passmark entries, including a DirectX 12 score of 30 and a DirectX 10 score of 54, which likely reflect specific driver or API limitations on that test harness rather than real-world capability. In the two benchmarks where both parts were measured under identical conditions, the RX 6400 wins decisively.

The Verdict

From the recorded data, the AMD Radeon RX 6400 is the clear performance winner in every head-to-head comparison. If the choice is between these two specific GPUs for any task that leverages OpenCL or Vulkan, the RX 6400 offers a 67.9% to 71.6% advantage, which is a massive gap. The Intel Iris Pro Graphics P580, being an integrated processor graphics solution with system-shared memory, cannot match the discrete AMD card's dedicated 4 GB GDDR6 memory with 128.0 GB/s bandwidth. That memory bandwidth difference alone explains much of the compute gap, as the Intel part's bandwidth is listed as "System Dependent," which in practice means it shares the CPU's memory bus and is subject to contention.

For a user who needs a low-power integrated solution, the Intel P580 consumes just 15 W and requires no power connectors, making it suitable for compact systems where the AMD card's 53 W TDP and single-slot footprint might be less desirable. However, the data does not support any scenario where the Intel part outperforms the RX 6400 in raw GPU compute or graphics rendering. The RX 6400 also supports DirectX 12 Ultimate (12_2) and Vulkan 1.4, while the Intel part only reaches DirectX 12 (12_1) and Vulkan 1.3. The verdict from the database is unambiguous: the RX 6400 is the superior GPU for performance, and the P580's only advantages are its minimal power draw and integrated form factor.

FAQ

Q: Which GPU has the higher average benchmark score?

A: The Intel Iris Pro Graphics P580 has an average score of 7,170, while the AMD Radeon RX 6400 averages 6,001. However, this does not reflect the head-to-head results, where the RX 6400 wins both recorded tests by large margins.

Q: What is the biggest performance gap between the two in a direct test?

A: In Geekbench OpenCL, the RX 6400 scores 32,011 versus the P580's 9,082, a delta of 71.6% in favor of AMD. This is the largest recorded difference in the head-to-head data.

Q: Does the Intel P580 support the same DirectX version as the RX 6400?

A: No. The Intel part supports DirectX 12 (12_1), while the AMD card supports DirectX 12 Ultimate (12_2), which includes additional features like ray tracing and mesh shaders.

Q: What is the memory configuration difference?

A: The Intel P580 uses system-shared memory with a system-dependent bandwidth, while the RX 6400 has 4 GB of dedicated GDDR6 memory on a 64-bit bus with 128.0 GB/s bandwidth.

Q: Which GPU has more shading units?

A: The AMD RX 6400 has 768 shading units, while the Intel P580 has 576. The AMD card also has 12 ray tracing cores, which the Intel part lacks entirely.

Q: Are both GPUs end-of-life products?

A: Yes. The Intel Iris Pro Graphics P580 is listed as end-of-life with a release date of August 2015, and the AMD Radeon RX 6400 is also end-of-life with a release date of January 2022.

Specification Differences

The two GPUs differ across nearly every measurable specification. The Intel Iris Pro Graphics P580 is built on a 14 nm+ process at Intel's foundry, while the AMD Radeon RX 6400 uses a 6 nm process at TSMC. The AMD chip packs 5,400 million transistors on a 107 mm² die, giving a transistor density of 50.5 million per square millimeter; the Intel part's transistor count and die size are not recorded in the database. Clock speeds diverge sharply: the Intel base clock is 350 MHz with a boost of 1000 MHz, while the AMD base is 1923 MHz, boost reaches 2321 MHz, and the game clock sits at 2039 MHz.

Memory is another major split. The Intel P580 has system-shared memory with a system-dependent bandwidth, whereas the RX 6400 comes with 4 GB of GDDR6 memory on a 64-bit bus delivering 128.0 GB/s. Shading units favor AMD at 768 versus 576, though Intel has more texture mapping units: 72 versus 48. Raster operation units heavily favor AMD at 32 versus 9. Pixel rate is 74.27 GPixel/s for AMD versus 9.00 GPixel/s for Intel, and texture rate is 111.4 GTexel/s versus 72.00 GTexel/s. FP32 compute is 3.565 TFLOPS for AMD versus 1,152.0 GFLOPS for Intel, and FP16 is 7.130 TFLOPS versus 2.304 TFLOPS.

Power consumption differs by a factor of roughly three and a half: the Intel part draws 15 W, the AMD card 53 W. The Intel GPU is an IGP with a Ring Bus interface and motherboard-dependent display outputs, while the AMD card is a single-slot discrete card with PCIe 4.0 x4 interface, no power connectors, a suggested PSU of 250 W, and outputs of 1x HDMI 2.1 and 1x DisplayPort 1.4a. API support also differs: AMD supports DirectX 12 Ultimate (12_2) and Vulkan 1.4, while Intel only reaches DirectX 12 (12_1) and Vulkan 1.3. Both support OpenGL 4.6.

Architecture Differences

The Intel Iris Pro Graphics P580 is based on the Skylake GT4e chip under the Generation 9.0 architecture, specifically the HD Graphics-W (Skylake) generation. It uses Intel's 14 nm+ process. The AMD Radeon RX 6400 is built on the Navi 24 chip with RDNA 2.0 architecture, part of the Navi II (RX 6000) generation, manufactured on TSMC's 6 nm process. This generational and process gap is significant: RDNA 2.0 is a modern gaming architecture designed for high clock speeds and efficient compute, while Generation 9.0 is an older integrated graphics design from the Skylake era.

The AMD card includes 12 ray tracing cores, a feature entirely absent from the Intel part. The Intel P580 has no RT cores, no tensor cores, and relies on its 576 shading units arranged in a configuration with 72 TMUs and only 9 ROPS. The low ROP count is a bottleneck for pixel-heavy workloads, which is reflected in the 9.00 GPixel/s pixel rate. The RX 6400's 32 ROPS and 74.27 GPixel/s pixel rate show how a modern discrete architecture allocates resources differently. The Intel part's FP16 performance is listed as 2:1 ratio to FP32, meaning it achieves 2.304 TFLOPS FP16 versus 1,152.0 GFLOPS FP32, a common pattern for older Intel graphics. The AMD card also uses a 2:1 ratio, with 7.130 TFLOPS FP16 versus 3.565 TFLOPS FP32, but the absolute figures are far higher.

The bus interface differs as well: Intel uses a Ring Bus, which connects the IGP to the CPU's memory controller, while AMD uses PCIe 4.0 x4, a dedicated external link. This architectural distinction explains why the Intel part's memory bandwidth is "System Dependent" and the AMD part has a fixed 128.0 GB/s. The AMD card's predecessor is listed as Navi and its successor as Navi III, while the Intel part has no predecessor or successor recorded. Both are end-of-life, but the RX 6400 is a much more recent design, released in January 2022 versus August 2015 for the Intel part.

Where Each One Wins

Based on the recorded data, the AMD Radeon RX 6400 wins in every head-to-head benchmark category. In Geekbench OpenCL, it leads by 71.6%, and in Geekbench Vulkan, it leads by 67.9%. These are the only direct comparisons available, and both favor AMD decisively. The RX 6400 also wins on raw specifications: higher clock speeds, more shading units, more ROPS, dedicated memory with higher bandwidth, and support for ray tracing via its 12 RT cores. For any gaming, 3D rendering, or compute task that uses OpenCL or Vulkan, the RX 6400 is the clear choice.

The Intel Iris Pro Graphics P580 wins in scenarios where power consumption and integration matter more than performance. Its 15 W TDP is less than a third of the AMD card's 53 W, and it requires no power connectors, no dedicated slot, and no separate PSU recommendation. For a thin-and-light laptop or a low-power embedded system where the GPU must share memory with the CPU and where the motherboard determines display outputs, the P580 is the only feasible option. It also has more TMUs (72 versus 48), which could theoretically benefit texture-heavy workloads if the memory bandwidth were not a limiting factor, but the database shows no benchmark where this translates into a win.

The percentile ranks tell a nuanced story: the Intel part is at the 39th percentile of all GPUs, while the AMD card is at the 35th. This means the Intel IGP actually outperforms a larger fraction of the database's GPU population than the RX 6400 does, despite losing the head-to-head. This is because the database includes many older and weaker GPUs that the P580 can beat, while the RX 6400's average is depressed by its low Passmark scores. The nearest rivals for the Intel part include the NVIDIA GeForce GTX 560 SE (0% delta), GTX 970 (0.2% ahead), AMD Radeon Vega 8 Mobile (0.5% ahead), and GTX 750 (0.7% ahead). The RX 6400's nearest rivals are the NVIDIA GeForce GTX 770M (0% delta), RTX PRO 6000 Blackwell Server (0.1% ahead), AMD FirePro W4100 (0.2% ahead), and Quadro K4000M (0.3% ahead). These rival comparisons show that both cards sit in a similar performance tier relative to their peers, but in a direct matchup, the RX 6400's modern architecture and dedicated memory give it an insurmountable lead.