AMD has released its latest mobile chips, the Ryzen 5 7545U and Ryzen 3 7440U, which are the first laptop processors to feature AMD’s new Zen 4c CPU cores. These cores were previously seen in the EPYC server chips and the entry-level AMD Ryzen Z1 chip for handheld gaming PCs. The Zen 4c cores offer most of the same features as Zen 4 cores but take up less space and run at lower speeds. AMD claims that the Zen 4c cores take up 35% less physical space than Zen 4, allowing for more cores in the same amount of space or the same number of cores in a smaller space.

The Ryzen 5 7545U and Ryzen 3 7440U chips replace the previous Ryzen 5 7540U and Ryzen 3 7440U Phoenix chips. The new chips still have the same number of CPU cores (6 for Ryzen 5 and 4 for Ryzen 3), but now some of those cores are Zen 4c chips, which should bring efficiency improvements and similar performance at lower power levels. The top speeds for the Zen 4c cores are not known, but they are estimated to be about 30% slower than Zen 4 cores.

The updated Ryzen 7040U lineup includes the following chips:

• Ryzen 7 7840U: 8 x Zen 4 cores, 8 / 16 cores / threads, 3.3 GHz / 5.1 GHz base / boost CPU frequency, 24MB cache, Radeon 780M graphics, DDR5 / LPDDR5 RAM, USB4 support, 15-30W TDP.
• Ryzen 5 7640U: 6 x Zen 4 cores, 6 / 12 cores / threads, 3.5 GHz / 4.9 GHz base / boost CPU frequency, 22MB cache, Radeon 760M graphics, DDR5 / LPDDR5 RAM, USB4 support, 15-30W TDP.
• Ryzen 5 7540U: 6 x Zen 4 cores, 6 / 12 cores / threads, 3.2 GHz / 4.9 GHz base / boost CPU frequency, 22MB cache, Radeon 740M graphics, DDR5 / LPDDR5 RAM, USB4 support, 15-30W TDP.
• Ryzen 5 7545U: 2 x Zen 4 cores, 4 x Zen 4c cores, 6 / 12 cores / threads, 3.2 GHz / 4.9 GHz base / boost CPU frequency, 22MB cache, Radeon 740M graphics, DDR5 / LPDDR5 RAM, USB4 support, 15-30W TDP.
• Ryzen 3 7440U (old): 4 x Zen 4 cores, 4 / 8 cores / threads, 3 GHz / 4.7 GHz base / boost CPU frequency, 12MB cache, Radeon 740M graphics, DDR5 / LPDDR5 RAM, USB4 support, 15-30W TDP.
• Ryzen 3 7440U (new): 1 x Zen 4 core, 3 x Zen 4c cores, 4 / 8 cores / threads, 3 GHz / 4.7 GHz base / boost CPU frequency, 12MB cache, Radeon 740M graphics, DDR5 / LPDDR5 RAM, USB4 support, 15-30W TDP.

Source: Liliputing.

AMD has introduced its first hybrid chips featuring a combination of Zen 4 and smaller Zen 4c CPU cores. This marks the first time AMD has mixed two different types of CPU cores on the same chip. The new architecture is similar to ARM’s big.LITTLE architecture and Intel’s use of Performance and Efficiency cores.

The Zen 4c cores take up less space and have some modifications that may result in lower performance in certain situations. The new chips that feature this hybrid architecture include the Ryzen 3 7440U, Ryzen 5 7540U, and the Ryzen Z1. The Zen 4c cores support hyperthreading, but tend to be paired with fewer graphics compute units and may have less L2 cache memory. A more powerful variant of the Ryzen Z1, the Ryzen Z1 Extreme, is used in the ASUS ROG Ally, which doesn’t use a hybrid chip.

Based on the chip model numbers, it is expected that the new Phoenix 2 processors will deliver lower performance compared to their original Phoenix counterparts. A report analyzing the performance of the Ryzen Z1 processor seems to confirm this.

Source: Liliputing.