Galaxy S5 USB 3.0 vs 2.0?

kevinmcc · Aug 7, 2014

Hey all was wondering if the USB 3.0 charges faster than 2.0? I need to buy a new extra cables for my vehicles and was wondering if there are differences.

kate · Aug 7, 2014

Hi kevinmcc, I moved your thread to the Galaxy S5 forum

WAWood8 · Aug 7, 2014

I need to buy a new extra cables for my vehicles

Most likely, at best, your vehicles have USB 2.0 -- and in that case, a USB 3 cable won't do any better than a USB 2 cable.

TG1 · Aug 7, 2014

For charging in your vehicle (or with a wall charger), it shouldn't make a difference. The USB 3.0 will charge faster and transfer data faster when hooked up to a computer vs USB 2.0 (if you have USB 3.0 ports on your computer).

n7plus1 · Aug 7, 2014

^correct, the cables dont supply voltage in amps to charge your device. Whatever the power supply is supplying the cable is the rate itll charge it at.

AZgl1500 · Aug 7, 2014

n7plus1 said:
^correct, the cables dont supply voltage in amps to charge your device. Whatever the power supply is supplying the cable is the rate itll charge it at.

right idea, but not entirely correct.

The cable must have a large enough gauge wire to support the higher charging current. The power source must be able to handle 2.1 amps or more for the S5's larger battery.

A short cable can support a higher charge current than a big long one. It has to do with the resistance of the very small gauge wires in those cables.

The charging port leads are in the USB 2.0 connector.
The USB 3.0 connector only has the higher speed data wires.

Smokey Joe · Aug 8, 2014

The 3.0 does charge faster than the 2.0. I use both between work and home. As for how and why... Does it really matter? LoL.

n7plus1 · Aug 11, 2014

AZgl1500 said:
The cable must have a large enough gauge wire to support the higher charging current. The power source must be able to handle 2.1 amps or more for the S5's larger battery.

well, yeah, thats implied. You can charge the battery however youd like. The devices battery doesnt dictate the wire gauge needed, that chargers amperage does. You could use a GS2's .7A charger and USB cable to charge if you'd like, or the GS3 or 4's 1.0A charger and cable if youd like. It'll just charge slower, but the idea here is that the cables arent backwards compatible. I wouldn't recommend using a USB cable that came with a .7A charger to use with a charger thats pushing 2.0A.

AZgl1500 said:
A short cable can support a higher charge current than a big long one. It has to do with the resistance of the very small gauge wires in those cables.

I would agree with you if we're talking 4ft. compared to 20ft.

but comparing 2-4ft. in cable length isn't that much of a difference...

JDL523 · Aug 11, 2014

I'd switch to the 3.0, I've charged both ways, and I can be down to about 10% battery, and my phone will be 80-100% charged in an hour. It's very noticeable when compared to 2.0

DeviceUser · Dec 18, 2015

I keep coming across forum entries insisting that USB 3.0 cables do not charge faster than 2.0 cables from a wall adapter and wanted to add my experience that it incontrovertably does.

HighSierra · Dec 25, 2015

I think it depends on the output of the wall wart.

Also USB 3 ports on PC deliver more charging current.

AZgl1500 · Dec 25, 2015

DeviceUser said:
I keep coming across forum entries insisting that USB 3.0 cables do not charge faster than 2.0 cables from a wall adapter and wanted to add my experience that it incontrovertably does.

What you need to "keep in mind" is one simple fact.

USB 3.0 is a DATA protocol, it has absolutely nothing to do with the charging circuits.
That 2nd port is used for DATA only, there is no Power Wiring in it at all.

The charger always uses the Power Wires that are in the USB 2.0 socket....
You must have a 2.1 Amp charger to charge the new phones at the faster rates.
does not matter if you are using an old cable or new cable.........
........ as long as, the cable being used has a conductor size large enough to pass 2.1 amps w/o any voltage drop.

DeviceUser · Jan 7, 2016

deleted because of formatting issues

DeviceUser · Jan 7, 2016

Obviously I'm using the same block otherwise I wouldn't attribute it to the cable. My s5 always takes just under 2 hours to charge from 10% to max with my white galaxy s5 USB 3.0 cable. if I use my black galaxy s3 USB 2.0 cable it takes more than 4 hours. I use the USB 2.0 one when I don't need to rapid charge to spare strain on my battery. Like the other guy above said, it doesn't matter why it works just that it works.

if I had to venture a guess I would say maybe USB 3.0 cables must be built with a lower impedance rating to ensure fast data capability but I'm not sure about that.

svim · Jan 7, 2016

kevinmcc said:
Hey all was wondering if the USB 3.0 charges faster than 2.0? I need to buy a new extra cables for my vehicles and was wondering if there are differences.

USB 3.x not only significantly increases your data transfer speeds (USB 2.0 max is 480 Mbit/s while USB 3.0 is 5 Gbit/s and 3.1 is 10 Gbit/s) but its numbers for power are much higher too. For the longest time 1.x -2.x were based on 5 volts and varied up to 2 amps. Now with 3.x we have 5, 12, or 20 volt standards that can supply up to 5 amps. And thankfully USB 3.x is backwards compatible with 1.x and 2.x devices. So yeah, 3.x will charge your device faster than 2.x. But as an example, my Galaxy S3 has a 2100 mAh battery so I'll never be able to take advantage of the higher power USB 3.x, at most my phone will only draw up to just over 2 amps (1 ampere = 1000 milliamperes).
https://en.wikipedia.org/wiki/USB#USB_Power_Delivery

A big problem is how fractured the USB standard has become, USB 3.0 and 3.1 both have their own subcategories. Of course avoid those bargain specials but also pay attention to specifics. A good cable will have good shielding inside, quality insulation, and sometimes consist of internal wiring that will determine it's just for a specific task (it's not just a matter of power only or data/power anymore).
Also keep in mind that power regulation in vehicles might not be as consistent, it's just not an environment where the power will always be 'clean'. If you have your phone plugged in when you start up your car/truck there's going to be big drop in power, possibly followed by a spike.

Galaxy S5 USB 3.0 vs 2.0?

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