AMD Radeon 520 vs AMD Radeon 660M

AMD Radeon 520

The Radeon 520 is a dedicated entry-level graphics card for laptops that was released in 2017. AMD reveals that the chip features five compute units based on the GCN architecture and 2 GB GDDR5 64-bit graphics memory. The new chip is not based on the Polaris architecture from 2016, but the old one that was introduced with the Radeon R5 M230 in 2014 and later used in the M330 and M430 / M440 / M445.

Due to the higher clock speed of up to 1030 MHz, the Radeon 520 should be slightly faster than the old Radeon R7 M445 (920 MHz, 320 shader units, GDDR5). However, the performance should be comparable, which means that demanding games like Dishonored 2, Call of Duty: Infinite Warfare or XCOM 2 should not run smoothly. Less demanding games like Overwatch, Fifa 17 (with a fast CPU) or Farming Simulator 17, would run well, but using low to medium detail settings. For detailed game benchmarks, visit the pages of the previous linked card. If only DDR3 is used, the performance should be on par with the Radeon R7 M440 (1021 MHz, 320 shader units, DDR3).

AMD Radeon 660M

The AMD Radeon 660M is an integrated GPU in the entry level Ryzen 6000 series for laptops (Rembrandt, e.g. Ryzen 5 6600U). The GPU is based on the RDNA2 architecture and has 6 of the 12 CUs (= 384 shaders) clocked at up to 1,900 MHz (depending on the CPU model). The 680M and 660M iGPUs are the first integrated graphics card with hardware raytracing support, although the performance is too slow to use it in current games.

Due to the halved CU count and lower core clock, the Radeon 660M is clearly slower than the Radeon 680M and most likely only on par with the old Radeon Vega 8 iGPUs. 

Thanks to the modern 6nm process and clever power-saving features, the power consumption is comparatively low (according to AMD), so the graphics card can also be used for slim and light notebooks (depending on the CPU model).