Samsung Galaxy S 4 Review - Part 1
by Brian Klug on April 24, 2013 12:01 AM ESTGalaxy S 4 - Powered by a Better Snapdragon 600 (APQ8064AB)?
At a high level, Samsung's Galaxy S 4 integrates Qualcomm's Snapdragon 600 SoC. From what Qualcomm told us about Snapdragon 600, we're dealing with four Krait 300 cores and an Adreno 320 GPU. The Krait 300 cores themselves are supposed to improve performance per clock over the original Krait CPU (Krait 200) through a handful of low level microarchitectural tweaks that we've gone through here. The Krait 300 design also allegedly improves the ability to run at higher frequencies without resorting to higher voltages. This isn't the first time we've talked about Snapdragon 600, but since then a few things have come to light.
Snapdragon 600 from HTC One - Chipworks
For starters, Chipworks got their hands on a Snapdragon 600 SoC (from an HTC One) and delayered the SoC. In its investigation, Chipworks discovered that Snapdragon 600 had the exact same die area as the previous generation Snapdragon S4 Pro (APQ8064). Also, although you'd expect APQ8064T markings on the chip itself, the part carried the same APQ8064 label as previous S4 Pro designs.
Avenger 2 Markings on Snapdragon 600 die from HTC One - Chipworks
Chipworks did note however that there were some subtle differences between a standard APQ8064 and the Snapdragon 600 SoC from the HTC One. The Snapdragon 600 from the One is labeled with an Avenger2 codename rather than Avenger, the latter was apparently present on prior APQ8064 designs. Chipworks also noticed differences in the topmost metal layer, although it's not clear whether or not they stopped there or found no differences in lower layers.
All of this points to a much more subtle set of physical differences between APQ8064 and the earliest Snapdragon 600s. Metal layer changes are often used to fix bugs in silicon without requiring a complete respin which can be costly and create additional delays. It's entirely possible that Krait 300 was actually just a bug fixed Krait 200, which would explain the identical die size and slight differences elsewhere.
That brings us to the Galaxy S 4. It's immediately apparent that something is different here because Samsung is shipping the Snapdragon 600 at a higher frequency than any other OEM. The Krait 300 cores in SGS4 can run at up to 1.9GHz vs. 1.7GHz for everyone else. Curiously enough, 1.9GHz is the max frequency that Qualcomm mentioned when it first announced Snapdragon 600.
Samsung is obviously a very large customer, so at first glance we assumed it could simply demand a better bin of Snapdragon 600 than its lower volume competitors. Looking a bit deeper however, we see that the Galaxy S 4 uses something different entirely.
APQ8064 from a Snapdragon 600 based HTC One - Chipworks
Digging through the Galaxy S 4 kernel source we see references to an APQ8064AB part. As a recap, APQ8064 was the first quad-core Krait 200 SoC with no integrated modem, more commonly referred to as Snapdragon S4 Pro. APQ8064T was supposed to be its higher clocked/Krait 300 based successor that ended up with the marketing name Snapdragon 600. APQ8064AB however is, at this point, unique to the Galaxy S 4 but still carries the Snapdragon 600 marketing name.
If we had to guess, we might be looking at an actual respin of the APQ8064 silicon in APQ8064AB. Assuming Qualcomm isn't playing any funny games here, APQ8064AB may simply be a respin capable of hitting higher frequencies. We'll have to keep a close eye on this going forward, but it's clear to me that the Galaxy S 4 is shipping with something different than everyone else who has a Snapdragon 600 at this point.
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mike55 - Wednesday, April 24, 2013 - link
One of the reasons I am considering the One is because of the camera. 4 MP should be enough for me since I would be viewing it on a 1080p display (2.1 MP) tops. But then I found out the field of view is really large, which would mean I would probably be more likely to crop photos. The images also aren't very impressive in good lightning conditions. It almost looks like it would be a downgrade from my iPhone 4 in terms of photos taken with good lightning. Of course the low light shots would be much better on the One.With the GS4, it feels like the camera is an upgrade in every way, and not just some ways, from my current phone. That, the larger screen, and the fact that the screen is OLED is pushing me towards the GS4. Still conflicted though, haha.
UpSpin - Wednesday, April 24, 2013 - link
I agree, 4MP should be enough, but is the lowest acceptable size. 6MP or maybe 8MP would have been better and safer.The HTC One photos in this review seem to be very blurry and poor compared to the same photos taken for the HTC One review:
http://images.anandtech.com/reviews/gadgets/HTC/HT...
http://images.anandtech.com/reviews/gadgets/Samsun...
I don't know what happened.
The field of view is large, which normally is an advantage, especially indoors. But you're right, outdoors, with the lower resolution it might be an issue.
Regarding OLED: I wrote it in another comment, too. I own a HTC Desire with one of the first OLED screens for smartphones. But also have access to a Galaxy Note with OLED. The colors are stunning, but just false. The max. brightness is poor compared to LCD, so outdoors it becomes more difficult too see the content. OLED consumes more power displaying bright objects (webpages), so much shorter battery life. The sub-pixel size is smaller which shouldn't be an issue any longer at such a high resolution and it also doesn't have pen-tile. The real advantage is that black is almost 100% black which is great :-) The disadvantages however are huge, and while I still like OLED technology and also use simpler OLED displays in my own projects, I think it's just inferior to LCD in smartphones right now. (see this review highlighting some issues). But the screen is larger, another advantage for the S4. Sad that the One has such a huge bezel.
Silellak - Wednesday, April 24, 2013 - link
The difference is likely that the camera was set to default or -1 Sharpness in the original HTC One photo and -2 sharpness in this review.gnx - Wednesday, April 24, 2013 - link
If my memory is correct, the OLED in HTC Desire was from CMI, not Samsung, so I'd think slightly inferior. That said, from all I can gather, AMOLED is still a technology in progress, each generation better than the last, though still with some trade-offs compared to the much more mature LCD. If there is one console, Samsung leads the OLED development, with it's Super AMOLED screens, so if you decide to stick to OLED, at least you know you're getting the best OLED out there with the SGS4.nerd1 - Wednesday, April 24, 2013 - link
4MP is not enough, unless the sensor is Foveon.DroidTomTom - Wednesday, April 24, 2013 - link
Button layout. That is my biggest gripe with the HTC One. The power button should never be on the top. I hated it on my Palm PDAs and on every smartphone I have had since. My Galaxy S has a button layout that just works.creathir - Wednesday, April 24, 2013 - link
Brian, the HTC's audio is flat out amazing.How is the audio on the GS4?
Are you planning on doing audio tests in the future? I know compared to my iPhone 5, the One blows it completely out of the water.
Toss3 - Wednesday, April 24, 2013 - link
Are you talking about headphone performance or external speakers?creathir - Wednesday, April 24, 2013 - link
External speakersscaramoosh - Wednesday, April 24, 2013 - link
How is plastic a downside? It's much better than dented scratched up metal that you'll have to wrap in a plastic case to protect it anyways. Just find it funny how the only two times people see their metal phones is when they buy it and when they sell it, the rest of the time it's in a stupid case. Having to buy a case alone is proof that metal isn't a good material for a phone.I dropped my Nokia, what did I do? Bought a new back cover, replaced it. What will I do with the One if I did the same? Oh, I'm fucked unless I want to pay HTC hundreds to fix it and be without a phone for a month.