AMD Radeon RX 7800M vs Intel Arc B390 Comparison

The AMD Radeon RX 7800M and Intel Arc B390 occupy distinct tiers in the database, with the recorded benchmark data showing a substantial performance gap. The AMD part holds an average benchmark score of 27,883, placing it in the 73rd percentile of all GPUs, while the Intel part averages 1,482, landing in the 9th percentile. Their head-to-head result in the 3DMark Steel Nomad DX12 test is decisive, with the AMD Radeon RX 7800M scoring 2,994 against the Intel Arc B390’s 1,482, a 102% difference. This page analyzes the architectural and measured differences between these two mobile graphics processors.

The Verdict

The data indicates a clear performance hierarchy. The AMD Radeon RX 7800M is the dominant part in every measurable aspect of the recorded benchmarks. Its average score of 27,883 is nearly nineteen times higher than the Intel Arc B390’s 1,482. In the sole head-to-head test, 3DMark Steel Nomad DX12, the AMD card finishes with 2,994 points, exactly 102% ahead of the Intel chip’s 1,482 points. For any workload represented by these benchmarks, the AMD Radeon RX 7800M is the choice based strictly on measured performance.

The Intel Arc B390, with its 80 W TDP and integrated form factor, is positioned for a different class of system. Its nearest rivals in the database, such as the NVIDIA GeForce GT 520MX (average score 1,463, 1.3% behind) and the NVIDIA GeForce 800M (average score 1,460, 1.5% behind), show that its performance level is comparable to entry-level discrete GPUs from over a decade ago. The AMD Radeon RX 7800M, by contrast, sits near the AMD Radeon Pro Vega 20 (average 27,839, 0.2% behind) and AMD Radeon Pro W5500X (average 27,973, 0.3% ahead). The verdict is that the AMD part is for demanding graphics tasks, while the Intel part serves basic display and compute functions.

Architecture Differences

The two processors are built on fundamentally different architectures. The AMD Radeon RX 7800M uses the Navi 32 chip with RDNA 3.0 architecture, codenamed Wheat Nas, fabricated on a 5 nm process at TSMC. It contains 28,100 million transistors on a 346 mm² die, yielding a transistor density of 81.2 million per square millimeter. The Intel Arc B390 uses the Panther Lake chip with Xe3-LPG architecture, fabricated on a 3 nm process at Intel. Its transistor count and die size are listed as unknown in the database, so no density figure can be stated.

Core configurations differ sharply. The AMD Radeon RX 7800M carries 3,840 shading units, 240 texture mapping units, 96 raster output units, and 60 ray tracing cores. The Intel Arc B390 carries 1,536 shading units, 48 TMUs, 24 ROPs, and 12 ray tracing cores. The AMD chip’s compute throughput is rated at 35.87 TFLOPS for FP32, while the Intel chip delivers 7.680 TFLOPS FP32, a 4.7 times difference. For FP16, the AMD part matches its FP32 rate at 35.87 TFLOPS (1:1 ratio), whereas the Intel part reaches 15.36 TFLOPS via a 2:1 ratio.

Memory architecture is another major split. The AMD Radeon RX 7800M has 12 GB of dedicated GDDR6 memory on a 192-bit bus, delivering 432.0 GB/s of bandwidth. The Intel Arc B390 uses System Shared memory, with the type, bus width, and bandwidth all listed as System Shared or System Dependent. The AMD card’s pixel rate is 224.2 GPixel/s versus 60.00 GPixel/s for the Intel part. Texture rates are 560.4 GTexel/s and 120.0 GTexel/s, respectively. Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, but the underlying hardware implementations are entirely different generations.

Where Each One Wins

The AMD Radeon RX 7800M wins in every benchmark category present in the database. Its 3DMark Steel Nomad DX12 score of 2,994 is the only direct head-to-head comparison, and it wins by 102%. Beyond that single test, the AMD part’s average benchmark score of 27,883 versus 1,482 for the Intel part indicates wins across the broader suite of recorded tests, including Geekbench OpenCL and Vulkan, PassMark DirectX 9 through 12, PassMark G2D, G3D, and GPU compute. The AMD card’s percentile rank of 73 versus the Intel card’s 9 confirms that it outperforms the vast majority of GPUs in the database, while the Intel part is in the bottom decile.

The Intel Arc B390’s only area of relative advantage is its power profile. Its TDP is 80 W versus 180 W for the AMD Radeon RX 7800M, meaning it draws less than half the power. Its base clock of 300 MHz is far lower than the AMD’s 1295 MHz, but its boost clock of 2500 MHz exceeds the AMD’s 2335 MHz boost. This suggests the Intel part is designed for constrained thermal envelopes where peak short-duration clocks matter more than sustained throughput. However, in terms of actual benchmark scores, the Intel part has zero wins (winsA: 1, winsB: 0), so no use case emerges from the data where it outperforms the AMD card.

FAQ

Q: How much faster is the AMD Radeon RX 7800M than the Intel Arc B390 in the recorded head-to-head test?

A: The AMD Radeon RX 7800M scores 2,994 in the 3DMark Steel Nomad DX12 test, while the Intel Arc B390 scores 1,482. This gives the AMD part a 102% advantage, meaning it delivers more than double the performance.

Q: What is the average benchmark score difference between these two GPUs?

A: The AMD Radeon RX 7800M has an average benchmark score of 27,883, while the Intel Arc B390 averages 1,482. The AMD part’s average is approximately 18.8 times higher.

Q: How do their nearest rivals compare in the database?

A: The AMD Radeon RX 7800M’s closest rival is the AMD Radeon Pro Vega 20 with an average score of 27,839, a 0.2% difference. The Intel Arc B390’s closest rival is the NVIDIA GeForce GT 520MX with 1,463, a 1.3% difference. These rival groups confirm the two cards operate in completely different performance strata.

Q: What are the TDP ratings for each card?

A: The AMD Radeon RX 7800M has a TDP of 180 W, while the Intel Arc B390 has a TDP of 80 W. The Intel part is rated for less than half the power draw.

Q: What memory configurations do they use?

A: The AMD Radeon RX 7800M uses 12 GB of GDDR6 memory on a 192-bit bus with 432.0 GB/s bandwidth. The Intel Arc B390 uses System Shared memory, with its type, bus width, and bandwidth listed as System Shared or System Dependent.

Q: Which card has more shading units and ray tracing cores?

A: The AMD Radeon RX 7800M has 3,840 shading units and 60 ray tracing cores. The Intel Arc B390 has 1,536 shading units and 12 ray tracing cores.

Head-to-Head Benchmarks

The database contains one direct head-to-head benchmark between these two parts: 3DMark Steel Nomad DX12. The AMD Radeon RX 7800M records a score of 2,994, and the Intel Arc B390 records 1,482. The winner is the AMD Radeon RX 7800M with a delta of 102%. This means the AMD card’s score is more than double the Intel card’s score, a margin that dwarfs the differences seen among their respective nearest rivals. For context, the AMD card’s closest rival, the AMD Radeon Pro Vega 20, is only 0.2% behind, while the Intel card’s closest rival, the NVIDIA GeForce GT 520MX, is just 1.3% behind. The 102% gap between the two reviewed cards is therefore a chasm relative to their own competitive sets.

Beyond the single head-to-head, the average benchmark scores reinforce the same conclusion. The AMD Radeon RX 7800M’s 27,883 average is built from a suite that includes Geekbench OpenCL (120,778), Geekbench Vulkan (126,668), PassMark G3D (17,613), and PassMark GPU Compute (9,342). The Intel Arc B390’s average of 1,482 comes solely from the 3DMark Steel Nomad result, as that is the only benchmark recorded for it. The percentile ranks tell the same story: 73rd for AMD versus 9th for Intel. The AMD part is not merely faster; it is in a different performance class entirely.

Specification Differences

The two cards differ in nearly every specification field recorded. The AMD Radeon RX 7800M uses a 5 nm TSMC process with 28,100 million transistors on a 346 mm² die. The Intel Arc B390 uses a 3 nm Intel process with unknown transistor count and die size. Clock speeds: AMD base 1295 MHz, boost 2335 MHz, game clock 2145 MHz, memory clock 2250 MHz (18 Gbps effective). Intel base 300 MHz, boost 2500 MHz, no game clock listed, memory clock System Shared. The AMD card has a 192-bit memory bus with 12 GB GDDR6 and 432.0 GB/s bandwidth; the Intel card has System Shared memory across all memory fields.

Compute resources: AMD has 3,840 shading units, 240 TMUs, 96 ROPs, and 60 RT cores. Intel has 1,536 shading units, 48 TMUs, 24 ROPs, and 12 RT cores. Throughput: AMD FP32 35.87 TFLOPS, FP16 35.87 TFLOPS (1:1); Intel FP32 7.680 TFLOPS, FP16 15.36 TFLOPS (2:1). Pixel rate: AMD 224.2 GPixel/s, Intel 60.00 GPixel/s. Texture rate: AMD 560.4 GTexel/s, Intel 120.0 GTexel/s. Power: AMD TDP 180 W, Intel TDP 80 W. Both are IGP slot width with no power connectors and portable-device-dependent display outputs. Bus interface: AMD PCIe 4.0 x16, Intel IGP. Release dates: AMD 2024-09-10, Intel 2026-01-26. Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Neither has a launch MSRP listed in the database.