Z2420 Atom (‘i386’) Chip

The Fonepad CPU is a i386-backwards-compatible (Intel) chip.
The first version was a Intel® Atom™ Z2420 1.2 GHz chip.
The second version is Intel® Atom™ Z2460 1.6 GHz.
A description is found on http://www.notebookcheck.net/Intel-Atom-Z2460-Notebook-Processor.69533.0.html (Sources: Anandtech):

  • http://cpuboss.com/cpu/Intel-Atom-Z2420


Clock speed 1.2 GHz
Cores Single core
Is hyperthreaded Yes


Has a NX bit Yes
  1. Supplemental SSE3
  2. SSE2
  3. SSE
  4. MMX
  5. SSE3


Threads 2 threads
L2 cache 0.5 MB
L2 cache per core 0.5 MB/core
Manufacture process 32 nms

power consumption

Typical power consumption None

Intel Atom Z2460

Intel Z2460The Intel Atom Z2460 is a SoC (System on a Chip) with the Codename Penwell and part of the Medfield platform. The Z2460 is a one chip SoC and integrates a single core Atom processor (Saltwell) clocked at 1.3 – 2.0 GHz. Due to Hyper-Threading two threads can be executed on the single core (for improved efficiency).

The Saltwell CPU core is still very similar to the first Intel Atom. Therefore, the performance per clock should be very similar (only very small enhancements). However, the CPU now features additional 256 KB low-power-cache (on a separate voltage plane) to allow the CPU and L2 cache to enter a lower power state. Furthermore, the Atom now supports some sort of Turbo Boost and can reach up to 2.0 GHz shortly (1.3 GHz base frequency). Furthermore, the CPU core can be downclocked to 100 MHz (in 100 MHz steps) to save power.

The processor performance should be on a level with a previous generation Atom processor clocked at 1.3 – 2.0 GHz (e.g., the Atom Z670 clocked at 1.5 GHz). Other smartphone SoCs based on ARM cores should be slower according to Intel. The SunSpider Javascript Benchmark and the BrowserMark scores for example should be higher than using a TI OMAP 4460 (Galaxy Nexus) or Apple A5 (iPhone 4S).

The integrated graphics card is based on a PowerVR SGX 540 design and clocked at 400 MHz. The video decoder (MPEG4.2, H.264, VC1, WMV) and encoder (MPEG4.2, H.264) also stem from Imagination Technologies (VDX385 and VDE285) and should allow 1080p30 de- and encoding of videos.

Furthermore, a dual channel LPDDR2 memory controller (2x 32 Bit) for a maximum of 1GB RAM is integrated.

The whole SoC was optimized for power efficiency and low power consumption. It is produced with a 32nm LP (low power) process. At 100 MHz the SoC should consume about 50 mW and at 1.6 GHz about 750 mW. Therefore, the Z2460 is even suited for smartphones and Intel is keen to point out the the average power consumption is very good compared to competitors like the iPhone 4S.

CPU Benchmarks

No benchmarks for this CPU found (yet).

Reviews for the Intel Atom Z2460 processor

Lenovo IdeaPad K2 ( unknown, 10.1″)
» Lenovo IdeaPad K2 – External Review; See below:


Lenovo IdeaPad K2


Lenovo IdeaPad K2Notebook: Lenovo IdeaPad K2
Processor: Intel Atom Z2460
Graphics Adapter: ?
Display: 10.1 inch, 16:10, 1280×800 pixels, glossy: yes
Weight: ? kg

Lenovo homepage
Lenovo notebook section



These graphics cards are not suited for Windows 3D games. Office and Internet surfing however is possible.

» Further information can be found in our Comparison of Mobile Graphics Cards and the corresponding Benchmark List.

 Intel Atom: The Intel Atom series is a 64-Bit (not every model supports 64bit) microprocessor for cheap and small notebooks (so called netbooks), MIDs, or UMPCs. The speciality of the new architecture is the “in order” execution (instead of the usual and faster “out of order” execution). Therefore, the transistor count of the Atom series is much lower and, thus, cheaper to produce. Furthermore, the power consumption is very low. The performance per Megahertz is therfore worse than the old Pentium 3M (1,2 GHz on par with a 1.6 GHz Atom).

Z2460: Soc with integrated single core Atom processor clocked at 1.3 – 2.0 GHz (short bursts), a PowerVR SGX 540 based GPU clocked at 400 MHz and a dual channel LPDDR2 memory controller.» Further information can be found in our Comparison of Mobile Processsors.

Lenovo reviews


Series Intel Atom
Codename Penwell
Clock Rate 1300 – 1600 MHz
Level 1 Cache 56 KB
Level 2 Cache 512 KB
Number of Cores / Threads 1 / 2
Max. Power Consumption (TDP = Thermal Design Power) 4? Watt
Manufacturing Technology 32 nm
64 Bit no 64 Bit support
Announcement Date 01/13/2012

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