Snapdragon 800 a battery friendly beast?

[ryude]

Wouldn't the bigger screen and LTE modem actually use more power than the N4 though? Not to mention 1080p vs 720p.

 

[jonup]

4 8 15 16 23 42



Sent from my Nexus 4 using xda app-developers app

If you don't get these right, it will say a lot about your statement about 4.4 efficiency.
@op SD800 is definitely a lot more efficient beast. That said lower voltage does not necessarily mean lower power draw (wattage). Judging by what I have seen from G2, sot on N5 should be right about 7-8h. This is way to much time to spend looking at the phone everyday. I would be among a extremely small minority that would have preferred smaller battery to reduce the phone's weight and bulk. 5h sot is more than enough to get you through the day. Let's be honest, 95%+ of use have the opportunity to charge our phones at least once a day, every day. More/bigger is actually not always better. Looking at you Samsung Mega 6.3.

 

[FlexiPack]

Wouldn't the bigger screen and LTE modem actually use more power than the N4 though? Not to mention 1080p vs 720p.

I was wondering about this too.

Sent from my Desire S using Tapatalk

 

[ryude]

After all, the CPU has never really been where the power was being used anyway. The screen has always been the biggest draw on the battery and this one is bigger while also denser in pixels.

 

[Turbotab]

Interesting, one thing I want to mention you're assuming the 'race-to-idle' condition for the CPU. And in web browsing, may not apply since the bottleneck is likely the network that it has to wait for, so even though the CPU may finish local tasks faster, it may spend extra (wasted) cycles waiting for the network to fetch the data. Or even RAM which are slower than local CPU cache.

Also some brief googling for the N4's S4 Pro (8064) chip voltage tables came up with something like this, for more accurate comparison

static struct acpu_level acpu_freq_tbl_fast[] __initdata = {
        { 1, {   384000, PLL_8, 0, 2, 0x00 }, L2(0),   850000 },
        { 0, {   432000, HFPLL, 2, 0, 0x20 }, L2(6),   875000 },
        { 1, {   486000, HFPLL, 2, 0, 0x24 }, L2(6),   875000 },
        { 0, {   540000, HFPLL, 2, 0, 0x28 }, L2(6),   900000 },
        { 1, {   594000, HFPLL, 1, 0, 0x16 }, L2(6),   900000 },
        { 0, {   648000, HFPLL, 1, 0, 0x18 }, L2(6),   925000 },
        { 1, {   702000, HFPLL, 1, 0, 0x1A }, L2(6),   925000 },
        { 0, {   756000, HFPLL, 1, 0, 0x1C }, L2(6),   975000 },
        { 1, {   810000, HFPLL, 1, 0, 0x1E }, L2(6),   975000 },
        { 0, {   864000, HFPLL, 1, 0, 0x20 }, L2(6),  1000000 },
        { 1, {   918000, HFPLL, 1, 0, 0x22 }, L2(6),  1000000 },
        { 0, {   972000, HFPLL, 1, 0, 0x24 }, L2(6),  1025000 },
        { 1, {  1026000, HFPLL, 1, 0, 0x26 }, L2(6),  1025000 },
        { 0, {  1080000, HFPLL, 1, 0, 0x28 }, L2(15), 1075000 },
        { 1, {  1134000, HFPLL, 1, 0, 0x2A }, L2(15), 1075000 },
        { 0, {  1188000, HFPLL, 1, 0, 0x2C }, L2(15), 1100000 },
        { 1, {  1242000, HFPLL, 1, 0, 0x2E }, L2(15), 1100000 },
        { 0, {  1296000, HFPLL, 1, 0, 0x30 }, L2(15), 1125000 },
        { 1, {  1350000, HFPLL, 1, 0, 0x32 }, L2(15), 1125000 },
        { 0, {  1404000, HFPLL, 1, 0, 0x34 }, L2(15), 1137500 },
        { 1, {  1458000, HFPLL, 1, 0, 0x36 }, L2(15), 1137500 },
        { 1, {  1512000, HFPLL, 1, 0, 0x38 }, L2(15), 1150000 },
        { 0, { 0 } }

With Qualcomm SoCS, you have to select voltage tables from the same PVS (binning), as they is quite a variance between them, but the S4 Pro is quite a bit worse then a Snapdragon 600, probably down to early 28nm immaturity.

Even if the DOM is waiting on network to fetch data, a S800 will scale its CPU via DVFS, and use less voltage than an S4 Pro in the same conditions, once the data is downloaded the S800 will render the page faster, making the user happier, and then either allow the CPU to power-gate cores or simply scale back the frequency via DVFS. Either way, the S800 will feel more responsive, and irrespective of whether the CPU is idle or at max utilisation, the beauty is that it'll need fewer volts than a N4. The only problem is price, surely Google can't offer all this phone for $299 / £199:fingers-crossed:

 

[Zahidow]

performance should be very good

 

[Turbotab]

I was wondering about this too.

Sent from my Desire S using Tapatalk

That's why I made my initial comparison with a HTC One, it has a similarly large 1080P screen and LTE, as the leaked Nexus 5 specs, and the battery size is the same.

 

[topgeardave]

Wouldn't the bigger screen and LTE modem actually use more power than the N4 though? Not to mention 1080p vs 720p.

Judging by the G2's 5.2" panel, screen on time isn't that bad as it'll be just a 5" version as that. And LTE is now built into the SoC so it idles much more quickly than before. That's why when the screen is off battery drain isn't that bad. Difference between dchspa+42 and LTE is negligible in terms of power input. And the 1080p vs 720p is negligible because the GPU is more powerful yet more efficient on battery when idling. Only thing that will kill battery on the N5 are poor apps with wakelocks and setting display brightness higher than 50%

Sent from my HTC Sensation using xda app-developers app

 

[ryude]

Judging by the G2's 5.2" panel, screen on time isn't that bad as it'll be just a 5" version as that. And LTE is now built into the SoC so it idles much more quickly than before. That's why when the screen is off battery drain isn't that bad. Difference between dchspa+42 and LTE is negligible in terms of power input. And the 1080p vs 720p is negligible because the GPU is more powerful yet more efficient on battery when idling. Only thing that will kill battery on the N5 are poor apps with wakelocks and setting display brightness higher than 50%

Sent from my HTC Sensation using xda app-developers app

I mean I have a Sony Xperia ZL with a 5" 1080p screen and same CPU/GPU as the N4 with a 2370mAh battery. It lasts a whole day for me, so I'm sure the N5 will do just as well.

 

[Whyzor]

Here's a more accurate comparison based on real battery tests done by GSMArena on Nexus 4 and LG G2. The N5 should have a slightly thriftier LCD panel than G2's 5.2", so the projected battery life may even be better.

http://blog.gsmarena.com/google-nexu...-galaxy-nexus/

Nexus 4:
32h Endurance Rating
14:17h 3G Talk time
4:34h Web Browsing
4:55h Video Playback

http://blog.gsmarena.com/lg-g2-batte...e-the-results/

LG G2 (3000 mAh battery):
62h Endurance Rating
25:01h 3G Talk Time
11:22h Web Browsing
11:51h Video Playback

Nexus 5 (Projected w/ 2300 mAh battery, 77% of LG G2's):
47h Endurance Rating
19:11h 3G Talk Time
8:43h Web Browsing
9:05h Video Playback

Most people, including me, get about 4.5 hrs of screen on time on N4, that translates to about 8+ hrs on Nexus 5 with same usage patterns.

 

[kamranhaghighi]

yes!!! see,! just wait for battery testes! i forgot what i was going to say

 

[topgeardave]

I mean I have a Sony Xperia ZL with a 5" 1080p screen and same CPU/GPU as the N4 with a 2370mAh battery. It lasts a whole day for me, so I'm sure the N5 will do just as well.

Could you check how much screen on time you receive at the end of the day when you're low on battery? You should technically get 4-5hours onscreen minimum on medium brightness

 

[supersain08]

Here's a more accurate comparison based on real battery tests done by GSMArena on Nexus 4 and LG G2. The N5 should have a slightly thriftier LCD panel than G2's 5.2", so the projected battery life may even be better.

http://blog.gsmarena.com/google-nexu...-galaxy-nexus/

Nexus 4:
32h Endurance Rating
14:17h 3G Talk time
4:34h Web Browsing
4:55h Video Playback

http://blog.gsmarena.com/lg-g2-batte...e-the-results/

LG G2 (3000 mAh battery):
62h Endurance Rating
25:01h 3G Talk Time
11:22h Web Browsing
11:51h Video Playback

Nexus 5 (Projected w/ 2300 mAh battery, 77% of LG G2's):
47h Endurance Rating
19:11h 3G Talk Time
8:43h Web Browsing
9:05h Video Playback

Most people, including me, get about 4.5 hrs of screen on time on N4, that translates to about 8+ hrs on Nexus 5 with same usage patterns.

Doesn't work like that. Lg's skin is for some reason more optimized for battery. As an example
LG Optimus G battery test
45h Endurance Rating
Talk: 15:30
Web: 5:15
Video:7:16
Now this phone is pretty much nexus 4 but with Lg's UI and LTE

Have a look at GSM arena's GS4, HTC ONE, and their Google play edition battery tests. The skinned version of the phones get better battery life even though they have more bloat.

 

[ryude]

Could you check how much screen on time you receive at the end of the day when you're low on battery? You should technically get 4-5hours onscreen minimum on medium brightness

I use auto brightness and I work nights so I'm sure it won't match up with others.

 

[persano]

if you need more battery buy a battery case

 

[JUMPhil]

if you need ,pre battery buy a battery case

wtf

 

[Lewythefly]

wtf

Ewe .............. this is why I am happy with the thickness of my N4 and the roughly 4hrs SOT which will last a full day no problem

As long as the N5 gets about 4hrs SOT I'll be ok with it, anymore and I'll be a happy camper

 

[antifocus]

Just want to say lower voltage doesn't necesarilly mean less power consumption, you have to take current into consideration.

 

[haris.herry]

WHAT ABOUT THE andreno 330 how much it takes power wise compared to 320.

 

[topgeardave]

Just want to say lower voltage doesn't necesarilly mean less power consumption, you have to take current into consideration.

Since lower voltages are being applied, you can easily infer that lower current is being used. Basic physics states to drive higher currents through fixed resistors and capacitors you need higher voltages.

Sent from my HTC Sensation using xda app-developers app