AMD A4-9120C vs AMD 3015e

AMD A4-9120C

The AMD A4-9120C is an entry-level chip from the Stoney-Ridge APU series for Chromebooks and entry level laptops (7th APU generation from 2016), which was announced early 2019. It is based on the similar named A4-9120 from 2016 but with a reduced TDP (6 versus 15 Watt) and reduced clock speeds of 1.6 - 2.4 GHz (compared to 2.2 - 2.5 GHz). Both CPUs integrate two CPU cores (one Excavator module with 2 integer and on FP unit).

It also includes a Radeon R4 GPU with 192 shaders at 600 MHz, as well as a single-channel DDR4-2133 memory controller, H.265 video engine and chipset with all I/O ports.

Architecture

Stoney Ridge is the successor of the Carrizo architecture and the design is almost identical. Thanks to optimized manufacturing processes and more aggressive Boost behavior, however, the clocks are a bit higher at the same power consumption. The memory controller now also supports DDR4-RAM, in this case up to 2133 MHz. Stoney Ridge is the designation for the smaller dual-core and single-core chip, while Bristol Ridge is the bigger quad-core chip with dual-channel memory controller. More technical details are available in the following articles:

• AMD's Bristol Ridge and Stoney Ridge Architecture
• AMD: Bristol Ridge APUs announced

Performance

Because of the significantly lower clock speed, the A4-9120C should be noticeably slower than the old A4-9120. AMD compares the A4-9120C with the Celeron N3350 in ChromeOS and sees a significant performance advantage for the A4. The efficiency however should be clearly worse as the A4-9120C is still manufactured in 28nm.

Power Consumption

AMD specifies the TDP of the A4-9120C with 6 Watts which should enable thin and light Chromebooks (even fanless).

AMD 3015e

The AMD 3015e is a dual-core, quad-thread processor (APU) of the Pollock product family. Its cores run at 1.2 GHz to 2.3 GHz and it has a low 6 W TDP, making it a good option for use in passively cooled laptops and ultra-small mini-PCs of the more affordable flavour. The processor first saw the light of day in 2020; it has a built-in Vega 3 graphics adapter running at up to 600 MHz.

Architecture & Features

This chip makes use of the rather dated Zen architecture for comparatively poor performance-per-MHz values. It has 4 MB of L3 cache and several PCI-Express 3.0 lanes for connecting NVMe SSDs, discrete graphics cards and other devices; its RAM controller functions in single-channel mode and supports DDR4-1600 memory or slower. AMD 3015e is compatible with Windows 10, Windows 11, and many Linux distros as well. Please note this is not a user-replaceable CPU. It gets soldered permanently to the motherboard (FT5 socket interface).

Performance

While we have not tested a single system built around the 3015e as of August 2023, we have some performance data for the 3050e, a chip that is just slightly superior. Based on that, the 3015e is a low-end option competing with the likes of the Intel N4500 and the Intel 4415U that is good for basic tasks and applications only.

Graphics

The Vega 3 runs at an unusually low clock rate of 600 MHz, or less. It will let you connect several monitors in resolutions as high as UHD 2160p, and it will happily decode AVC, HEVC and VP9-encoded videos, too. The latest AV1 video codec is not supported; such a video will have to be software-decoded, with the limited CPU horsepower putting a hard limit on video resolution that can be played back without stuttering. Expect to see a lot of dropped frames when watching a 1080p30 video.

Gaming is possible to a very limited extent with this iGPU. Even if it's CS:GO or a similarly old game that you want to play, be prepared to set the settings to Low.

Power consumption

This little AMD processor has a low default TDP (also known as the long-term power limit) of 6 W, making it one of the better options for use in a passively cooled laptop, tablet, mini-PC.

The AMD 3015e is manufactured on a 14 nm process leading to poor, as of mid 2023, energy efficiency.