On the outside, the U.S. and African/South Korean versions of Samsung Galaxy S4 look alike, but on the inside, there are major differences in key components.
This came to light through a physical dissection of the devices conducted by the IHS iSuppli Teardown Analysis Service.
Excerpts of the report, published by Cellular News indicated the differences include the apps processor, the wireless subsystem and the user interface, adding that all of the permutations resulted in significant variations in the capabilities and pricing of the two versions.
“While the Korean/African and US versions of the Galaxy S4 look pretty much the same and have in terms of their core electronics many same core features such as the enclosure, display, camera and battery, the products are as different from each other as kimchee and coleslaw," said Vincent Leung, Senior Analyst, Teardown Services at IHS.
The US version of the recently launched smartphone has 16 gigabytes of internal flash memory and carries a bill of materials (BOM) of $229.00, which rises to $237.00 when the manufacturing cost is added, while the Korean/African edition with the same memory has a BOM of $244.00 and a combined manufacturing and component cost of $252.00.
"With at least four different known incarnations of the Galaxy S4, Samsung is demonstrating its strategy of offering a mobile product that has appealing features and pricing to suit the tastes of varying markets or regions," Leung said
Leung also stated that Samsung’s approach is in stark contrast to the one-size-fits-all philosophy used by Apple, Samsung's primary competitor in the wireless space.
The marked differences
The following are the marked differences between the Korean and US versions of S4 as identified by IHS.
Processor permutations One of the biggest differences between the two versions of the Galaxy S4 is the apps processor. The U.S. version offered by AT&T employs the Qualcomm Inc. Snapdragon 600 quad-core processor, costing $20.00. The Korean variation and some other international versions integrate Samsung's own Octacore Exynos 5 processor, an eight-core device that costs $8.00 more at $28.00.
The Octacore Exynos 5 enables some unique, processor-intensive applications that are not possible with the Snapdragon processor. These include eye-movement recognition, which allows a user to pause a video simply by looking away from the S4 display.
The Octacore Exynos 5 also features the big.LITTLE architecture developed by ARM Holdings, which consists of four 1.6-gigahertz (GHz) Cortex-A15 "big" cores and four 1.2GHz Cortex-A7 "LITTLE" cores.
The big cores, which deliver higher-performance capabilities and use more power, handle higher-priority tasks or those demanding computational intensity. The LITTLE cores, not as powerful and using less energy, are delegated to lower-priority or less demanding tasks.
Such a configuration allows the big.LITTLE architecture to achieve a balance of performance and power efficiency, making the Korean phone fast and allowing it a long battery life.
Less is more for wireless
The wireless subsystem of the US version of the Galaxy S4 costs $1.50 more than the Korean version. The part selection in this subsystem also varies, with the US version using the MDM9215M and WTR1605L devices from Qualcomm. Meanwhile, the Korean version contains Samsung's baseband and radio frequency transceiver and front end.
Interface the nations
More noteworthy differences can be found in the respective user interface and sensor subsystems of the Korean and US versions.
The Korean S4 features a Silicon Motion Mobile TV system-on-chip device, whereas the US S4 features a separate Fujitsu image processor to offload the core processor when using the camera processing.
Samsung's Octa-core Exynos 5 likely handles the image processing itself in the Korean version, eliminating the need found in the US version for a separate Fujitsu image processor within the Qualcomm solution. Interestingly, even though the Korean version has added the Mobile TV feature, its user interface and sensor subsystem still costs $2.00 less than the US model with the added Fujitsu image processor.
On the radio More distinctions can be found in the subsystems containing the wireless local area network (WLAN), Bluetooth, FM radio and GPS.
The Korean and US versions use the Broadcom BCM4335 chip. However, the Korean model requires a discrete BCM47521 from Broadcom to support GPS functionality. The extra Broadcom chip is not in the US carrier version, as the Qualcomm Snapdragon provides onboard GPS functionality. Because of this, the US version's WLAN/BT/FM/GPS section costs $2.00 less than the Korean version.
Samsung's S4 supremacy
One thing that all versions of the Galaxy S4 share is their extensive use of Samsung-made components. "No other company in the world has an internal supply chain like Samsung's," Leung said. " "The display, memory, apps processor, baseband, RF transceiver, cameras, power amplifier and a range of other parts -- all these make Samsung unique in its capability to supply key parts and capture so much value in a mobile device."