AMD has been reluctant to undertake a hybrid core structure, making all its mainstream choices a homogeneous Zen 4 design with a shared L3. Regardless, there are particular heterogeneous designs that cut up the workloads between Zen 4 and It was 4c cores. The Ryzen “Phoenix 2” processor powering the ASUS ROG Ally and a bunch of different handhelds is one such instance. Courtesy of David Huangwe get to have a look at the person efficiency traits.
At inventory, the Zen 4 “P” core is roughly 30% quicker than the Zen 4 Dense “E” core within the SPEC CPU 2017 Integer benchmark. Making the clock speeds static at 3.2GHz on each cores ends in a tieverifying that they’re primarily based on the identical microarchitecture.
In Cinebench R23 (multi-threaded), the 25W Ryzen 7 7840U (Zen 4 x8) is sort of 20% quicker than the 30W Z1 hybrid core processor. Do not forget that the latter additionally options quicker LPDDR5X-7500 reminiscence whereas the previous is paired with LPDDR5-6400.
The voltage/frequency graph signifies that the Zen 4 Dense cores are extra environment friendly between 500MHz to 1,500MHz, after which the Zen 4 core takes the lead in efficiency and energy effectivity.
The SPECint2017 Power Effectivity take a look at was carried out utilizing SKUs paired with totally different reminiscence kits and therefore can’t be used for an apples-to-apples comparability. Regardless, the Phoenix 2 chip affords increased efficiency from 7W to 15W. This may be as a result of or partly as a result of LPDDR5X reminiscence (versus LPDDR5 on the 7840U), however we are able to’t say something for certain.
These checks present that AMD’s Phoenix 2 hybrid CPU affords superior energy effectivity than present Zen 4 designs with out altering the ISA. On the identical time, a lot of the benefits of the Zen 4 Dense cores are restricted to low-frequency workloadswhich get eradicated in high-performance workloads. We’ll simply have to attend for a next-gen heterogeneous Ryzen CPU to raised perceive how Staff Crimson is dealing with this explicit problem.
