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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krumme - Wednesday, April 24, 2013 - link
Comparing at 200 nits, is fine, but at that brightness you actually get a more contrasty picture of Oled because of the darkness. For all practical usage - depending on your eyes - you can turn brightness relatively more down on the Oled.You might note that the color accuracy of the S4 is far better than the One. Thats not to mention the contrast. Ofcourse it lacks the brightness. But the presentation here is one sided.
If you find yourself at bars at night or shooting food at the restaurant go for the One camera. But before you do, you might want to compare the pictures plenty available on the net on fx. gsmarena or phonearena
UpSpin - Wednesday, April 24, 2013 - link
If the surrounding is bright, you need a bright display, which OLED struggles at, even with a better contrast, which gets more and more negligible the brighter your surrounding is. At night however you really see the difference between the true black OLED and greyish LCD.I don't know how to properly interpret the color charts, so I judge by the impression of the author which favors the HTC One display (see the HTC One review and this review 'Admittedly this mode does tighten things up a bit, but it still isn't perfect and I'd still like to see Samsung do something to reign this in at some point. ') and the numbers in the article:
HTC One vs. SGS4
Grayscale 200nits Avg dE2000: 5.391 vs. 7.511
CCT Avg (K): 8118 vs. 7020
Saturation Sweep Avg dE2000: 3.365 vs. 7.823
GMB ColorChecker Avg dE2000: 4.656 vs. 7.440
The color charts seem to look better for the SGS4, the 'Total gamma' and greyscale charts however disastrous.
krumme - Wednesday, April 24, 2013 - link
For practical usage i agree the brightness for most people can be an issue in sunlight. We just have to remember there is much more at play here than just brightness.But at the same way using a phone in bright surroundings favor the saturation of Oled.
I never understand the standard setting on the S2 or S3. It gave stupid colors imho (and the sharpness wasnt there either imho compared to LCD competition). But if you chose fx. natural on the S3 i think you are pretty much where the colors is okey for everything personal. Its the grey scale that suffers - the shaddow details is very bad imho. Apparently thats still an issue on the S4.
But the basic problem about reviewing the display this way, is that we get zero numbers for the all important dynamics of the picture. And its just so obvious for the eye that oled got something here.
nerd1 - Wednesday, April 24, 2013 - link
What matters is the perceived CONTRAST, not the brightness itself.Practically AMOLED has better contrast overall, which helps sunlight reading a bit although bit dimmer.
sigmatau - Thursday, April 25, 2013 - link
I feel you are just guessing based on what you see on paper. My Samsung AMOLED plus screen is useless in the sun with full brightness. Most reviewers said that the HTC's screen kills the S4's screen. I am thinking of buying an HTC One and trying it out for a day or two before deciding. I really do like the blacks on OLED screens.krumme - Thursday, April 25, 2013 - link
Nonsense. Plenty sites gives the edge to Samsung. But i guess most just turn the autopilot on. Something happened since your amoled screen. Sunlight legibility is a personal matter, because reflection also plays a big role.sigmatau - Thursday, April 25, 2013 - link
Bull shit. My OLED screen is the best with Nokia's superior filter and still is terrible in the sunlight. I have to find shade just to use the phone. And remember, mine is a plus OLED screen, these on the S3 and S4 are not, which makes them worse.UpSpin - Thursday, April 25, 2013 - link
The glass reflects a lot of the sunlight.The display must be brighter than the reflections to remain readable. That's independent of contrast in the first place. So either reduce the reflections (AR coating, Nokia polarisation) or increase the brightness. The contrast isn't important in the first place here. OLEDs have a lower brightness than LCD, thus, and just as every review talking about outdoor use agrees with, LCD is much better readable outdoors.If you have a very dark display with an impressive contrast you won't see anything in sunlight, because the reflections are much brighter than the content on your display.
Special outdoor display also don't just have RGB, but RGBW, just to make it even brighter for outdoor use.
krumme - Thursday, April 25, 2013 - link
Go here to see an measurement of sunlight contrast ratio:http://www.gsmarena.com/samsung_galaxy_s4-review-9...
S4 is quite good, and if i recall about the same order as One.
ssj3gohan - Wednesday, April 24, 2013 - link
Wait a sec... you have an LTE/HSPA synthesizer, right? Why don't you try out battery life with that, so you're guaranteed to have equal signal strength, bandwidth and latency throughout the tests instead of having to rely on different vendors, signal quality and concurrency.