AMD Radeon 660M vs AMD Radeon RX 7800 XT Comparison

The AMD Radeon 660M and the AMD Radeon RX 7800 XT occupy contrasting ends of the graphics spectrum. The 660M is an integrated processor graphics solution built for mobile efficiency, while the RX 7800 XT is a dedicated desktop card built for high-end rasterization and ray tracing. The recorded data shows a clear performance hierarchy, but the details of that gap, and where each part excels, reveal a more nuanced story than simply comparing two benchmark scores.

Head-to-Head Benchmarks

The database contains two direct comparative benchmark results for these GPUs, both from the Geekbench suite. In the OpenCL test, the AMD Radeon RX 7800 XT delivered a score of 18,290, while the AMD Radeon 660M managed 12,876. This translates to a 29.6% deficit for the integrated part. That is a substantial margin, but not a complete blowout, suggesting that in compute-heavy workloads that scale well, the 660M can still hold its own to a degree, likely due to its RDNA 2 architecture and 384 shading units.

The Vulkan result tells a different, more decisive story. Here, the RX 7800 XT scored 54,228, while the 660M scored 14,748. The delta percentage for the 660M is -72.8%, meaning it trails by nearly three-quarters of the RX 7800 XT's performance. Vulkan is a low-overhead API that often favors discrete GPUs with high memory bandwidth and raw shader throughput. The RX 7800 XT's massive advantage in this test, over three times the score, indicates a fundamental difference in graphics processing capability that goes beyond simple clock speed differences.

Across the two head-to-head tests, the RX 7800 XT wins both, giving it a 2-0 record in direct comparisons. The 660M wins neither. This is not unexpected given their positions in the market, but the variance between the two tests is noteworthy. The OpenCL gap is relatively modest, hinting that the 660M can be competitive in certain compute tasks. The Vulkan gap is enormous, pointing to the RX 7800 XT's dominance in modern gaming and graphics-heavy applications. In broader context, the RX 7800 XT's average benchmark score of 11,627 places it near the NVIDIA GeForce GTX 1660, which sits 0.5% ahead, and the AMD Radeon Pro 5500M, which trails by 0.9%. Meanwhile, the 660M's average score of 13,812 places it near the NVIDIA RTX A2000 Mobile, which is 0.1% ahead, and the AMD Radeon RX 7900 XT, which trails by 0.5%. These nearest rival data points show that both chips perform in line with their direct contemporaries, even if the two are in completely different leagues.

FAQ

Q: Which GPU has the higher average benchmark score?

A: The AMD Radeon 660M has an average benchmark score of 13,812, which is higher than the AMD Radeon RX 7800 XT's average of 11,627. This average includes different test suites, and the RX 7800 XT's score is pulled down by low results in some Passmark tests.

Q: How does the RX 7800 XT compare to the 660M in the Vulkan API?

A: In the Geekbench Vulkan test, the RX 7800 XT scored 54,228, while the 660M scored 14,748. This gives the RX 7800 XT a 72.8% advantage over the 660M in that specific benchmark.

Q: What is the transistor density of each GPU?

A: The AMD Radeon 660M has a transistor density of 63.0 million transistors per square millimeter, while the AMD Radeon RX 7800 XT has a density of 81.2 million per square millimeter.

Q: What is the launch MSRP of the RX 7800 XT?

A: The launch MSRP for the AMD Radeon RX 7800 XT is 499 USD. The AMD Radeon 660M has no recorded launch MSRP in the database.

Q: Which GPU has more RT cores?

A: The AMD Radeon RX 7800 XT has 60 RT cores, whereas the AMD Radeon 660M has 6 RT cores.

Q: What is the production status of each GPU?

A: The AMD Radeon 660M is marked as End-of-life, while the AMD Radeon RX 7800 XT is marked as Active.

Where Each One Wins

The AMD Radeon RX 7800 XT wins in every direct head-to-head benchmark recorded. It is decisively ahead in both OpenCL and Vulkan workloads, with the Vulkan delta being particularly stark. For users running modern 3D games, heavy graphical simulations, or any workload that leverages Vulkan's low-overhead access to the GPU, the RX 7800 XT is the clear choice. Its 16 GB of GDDR6 memory, 3840 shading units, and 60 RT cores provide the hardware resources necessary for high-resolution textures and real-time ray tracing.

The AMD Radeon 660M, despite losing both direct comparisons, still has a niche. Its higher average benchmark score of 13,812, compared to the RX 7800 XT's 11,627, is notable. This is driven by the 660M's performance in the Geekbench OpenCL test, where it is only 29.6% behind the discrete card. For compute tasks that are not graphics-intensive, such as certain physics simulations, video encoding, or general-purpose GPGPU work that scales well with the 660M's 384 cores, the integrated part can be surprisingly effective. Its 40 W TDP also means it can be used in thin, light laptops without a dedicated power supply, making it a win for portability and battery life, though the database does not quantify that aspect.

Specification Differences

The two GPUs differ in nearly every measurable specification. The memory setup is a clear divide. The RX 7800 XT has 16 GB of GDDR6 on a 256-bit bus, delivering 624.1 GB/s of bandwidth. The 660M uses System Shared memory, with a bus width listed as System Shared and bandwidth as System Dependent. This means the 660M relies on the laptop's main memory, which is a bottleneck for high-bandwidth tasks.

The core configurations are also vastly different. The RX 7800 XT has 3840 shading units, 240 texture mapping units, and 96 render output units. The 660M has 384 shading units, 24 TMUs, and 16 ROPs. The RX 7800 XT has a boost clock of 2430 MHz, while the 660M boosts to 1900 MHz. Pixel rate for the RX 7800 XT is 233.3 GPixel/s versus 30.40 GPixel/s for the 660M. Texture rate is 583.2 GTexel/s versus 45.60 GTexel/s. FP32 compute is 37.32 TFLOPS versus 1,459.2 GFLOPS, a 25-fold difference.

The physical and power profiles are equally divergent. The RX 7800 XT has a TDP of 263 W, requires 2x 8-pin power connectors, and a suggested power supply of 600 W. It is a dual-slot card measuring 267 mm in length, 111 mm in height, and 50 mm in width. The 660M has a TDP of 40 W, uses no power connectors, and is listed as an IGP with no dimensions. The RX 7800 XT uses a PCIe 4.0 x16 interface, while the 660M uses PCIe 4.0 x8. The RX 7800 XT offers 1x HDMI 2.1a and 3x DisplayPort 2.1 outputs, whereas the 660M's display outputs are listed as Portable Device Dependent.

Architecture Differences

The architectural gap between these two is generational. The AMD Radeon 660M is built on RDNA 2.0, using the Rembrandt chip, and is fabricated on a 6 nm process at TSMC. It belongs to the Navi II IGP generation. The RX 7800 XT is built on RDNA 3.0, using the Navi 32 chip with the codename Wheat Nas, and is fabricated on a 5 nm process, also at TSMC. It belongs to the Navi III (RX 7000) generation.

This process difference is significant. The 5 nm node allows for a transistor density of 81.2 million per square millimeter, versus 63.0 million for the 6 nm node. The RX 7800 XT contains 28,100 million transistors on a 346 mm² die, while the 660M contains 13,100 million on a 208 mm² die. The newer RDNA 3.0 architecture also introduces a different FP16 compute capability. The RX 7800 XT achieves 37.32 TFLOPS FP16 at a 1:1 ratio with FP32, indicating full-rate FP16 execution. The 660M achieves 2.918 TFLOPS FP16 at a 2:1 ratio, meaning FP16 runs at half the rate of FP32. This suggests the RDNA 3.0 architecture is designed to handle mixed-precision workloads more efficiently.

Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, so API feature sets are identical. However, the RT core counts differ: 60 for the RX 7800 XT versus 6 for the 660M. This is a 10x difference in ray tracing hardware. The RX 7800 XT's predecessor is listed as Navi II, and its successor is Navi IV. The 660M's predecessor is Vega II IGP, and its successor is Navi III IGP.

The Verdict

The data paints a clear picture for different user profiles. The AMD Radeon RX 7800 XT is the dominant performer in all recorded graphics benchmarks. Its 72.8% lead in Vulkan over the 660M makes it the obvious choice for gamers, 3D artists, and anyone running applications that rely on modern graphics APIs. Its 16 GB of dedicated GDDR6 memory, combined with 60 RT cores, ensures it can handle high-resolution textures and ray-traced effects. The RX 7800 XT is for users who need maximum discrete graphics performance in a desktop system, and its active production status and launch MSRP of 499 USD position it as a current mainstream high-end option.

The AMD Radeon 660M, while technically outclassed, serves a completely different purpose. It is an integrated GPU for mobile devices, with a 40 W TDP and no power connectors. Its higher average benchmark score of 13,812, driven by a respectable OpenCL result, suggests it is not a slouch in compute tasks. For users who need a laptop for everyday productivity, light gaming, and occasional compute acceleration without the need for a discrete graphics card, the 660M is a functional solution. Its end-of-life status indicates it is a previous-generation part, but its performance in the database shows it remains relevant for mobile workloads. The choice is not about which is better in absolute terms, but which fits the user's hardware constraints and performance requirements. The RX 7800 XT for desktop enthusiasts, the 660M for portable efficiency.