The AMD Ryzen 5 6600HS is a processor for big (gaming) laptops based of the Rembrandt generation. The R5 6600HS integrates six of the eight cores based on the Zen 3+ microarchitecture. They are clocked at 3.3 (guaranteed base clock) to 4.5 GHz (Turbo) and support SMT / Hyperthreading (12 threads). The chip is manufactured on the modern 6 nm TSMC process. The HS variant is notable for its 10 W lower TDP than the usual 45 W and therefore a lower sustained performance than the H version.
The new Zen 3+ is a refresh of the Zen 3 architecture and should not offer a lot of changes. The chip itself however, offers a lot of new features, like support for USB 4 (40 Gbps), PCI-E Gen 4, DDR5-4800MT/s or LPDDR5-6400MT/s, WiFi 6E, Bluetooth LE 5.2, DisplayPort 2, and AV1 decode.
The processor performance should be faster than the old Ryzen 5 5600HS thanks to the higher clock rates. However, the new Alder Lake H-series CPUs, like the i5-12600H should offer a higher performance. The similar R5 6600H (45W) has a higher TDP and therefore should be faster when running long term multi-threaded loads.
In the 6000 series, AMD finally switched to the current RDNA 2 graphics architecture for the iGPU. The 6600HS only offers the slower Radeon 660M with 6 of the 12 CUs enabled and 1.9 GHz max. clock rate.
The TDP of the APU is specified at 35 Watts making the Ryzen 5 better suited for thin and light laptops. The power efficiency should be very good, thanks to the improved 6nm process and additional power saving features in the 6000 series.