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).

Series	AMD Bristol Ridge
Codename	Stoney Ridge
Series: Bristol Ridge Stoney Ridge AMD A9-9425 3.1 - 3.7 GHz 2 / 2  AMD A9-9420e - 2.5 GHz 2 / 2  AMD A9-9420 3 - 3.6 GHz 2 / 2  AMD A9-9410 2.9 - 3.5 GHz 2 / 2  AMD A6-9225 2.6 - 3.1 GHz 2 / 2  AMD A6-9220 2.5 - 2.9 GHz 2 / 2  AMD A6-9220C 1.8 - 2.7 GHz 2 / 2  AMD A6-9210 2.4 - 2.8 GHz 2 / 2  AMD A4-9120 2.2 - 2.5 GHz 2 / 2  AMD A4-9120C « 1.6 - 2.4 GHz 2 / 2  AMD E2-9010 2 - 2.2 GHz 2 / 2  AMD E2-9000 1.8 - 2.2 GHz 2 / 2  AMD A6-9220e 1.6 - 2.4 GHz 2 / 2
Clock Rate	1600 - 2400 MHz
Level 1 Cache	160 KB
Level 2 Cache	1 MB
Number of Cores / Threads	2 / 2
Power Consumption (TDP = Thermal Design Power)	6 Watt
Transistor Count	1200 Million
Manufacturing Technology	28 nm
Die Size	124.5 mm2
Socket	BGA
Features	Single-Channel DDR4-2133, Virtualization,
GPU	AMD Radeon R4 (Stoney Ridge) ( - 600 MHz)
64 Bit	64 Bit support
Architecture	x86
Announcement Date	01/06/2019

Benchmarks

- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance

Reviews for the AMD A4-9120C processor

Acer TravelMate B114-21-42BG: AMD Radeon R4 (Stoney Ridge), 14.00", 1.7 kg
  External Review » Acer TravelMate B114-21-42BG

Acer Chromebook CB315-2HT-47WG: AMD Radeon R4 (Stoney Ridge), 15.60", 1.8 kg
  External Review » Acer Chromebook CB315-2HT-47WG

Acer Chromebook Spin 311 R721T-482Z: AMD Radeon R4 (Stoney Ridge), 11.60", 1.5 kg
  External Review » Acer Chromebook Spin 311 R721T-482Z

Acer Chromebook 15 CB315-2H-4451: AMD Radeon R4 (Stoney Ridge), 15.60", 1.8 kg
  External Review » Acer Chromebook 15 CB315-2H-4451

HP Chromebook 11A G6 EE-6HL33EA: AMD Radeon R4 (Stoney Ridge), 11.60", 1.3 kg
  External Review » HP Chromebook 11A G6 EE-6HL33EA

HP Chromebook 14-db0020nr: AMD Radeon R4 (Stoney Ridge), 14.00", 1.5 kg
  External Review » HP Chromebook 14-db0020nr

Acer Chromebook 315 CB315-2HT: AMD Radeon R4 (Stoney Ridge), 15.60", 1.7 kg
  External Review » Acer Chromebook 315 CB315-2HT