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.
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:
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.
AMD specifies the TDP of the A4-9120C with 6 Watts which should enable thin and light Chromebooks (even fanless).
|Series||AMD Bristol Ridge|
|Series: Bristol Ridge Stoney Ridge|
|Clock Rate||1600 - 2400 MHz|
|Level 1 Cache||160 KB|
|Level 2 Cache||1 MB|
|Number of Cores / Threads||2 / 2|
|Max. Power Consumption (TDP = Thermal Design Power)||6 Watt|
|Transistor Count||1200 Million|
|Manufacturing Technology||28 nm|
|Die Size||124.5 mm2|
|Features||Single-Channel DDR4-2133, Virtualization,|
|GPU||AMD Radeon R4 (Stoney Ridge) ( - 600 MHz)|
|64 Bit||64 Bit support|
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance
Reviews for the AMD Bristol Ridge A4-9120C processor
Acer Chromebook 315 CB315-2HT (AMD Radeon R4 (Stoney Ridge), 15.6")
» Acer Chromebook 315 CB315-2HT - External Review