how many mb/s is USB 3.0?

J

johnfallon

New Member
I only get 41mb/s this seems like usb 2.0 what am I doing wrong?

this is transferring from my external hard drive to my cpu that both use usb 3.0
 
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Which external drive is it? The bus itself is rated for 5 Gbit (625 MB/sec), although your storage device on either end is going to be more limited than that.

USB 2.0 tops out around 30 MB/sec on transfers.
 
my usb 2.0 bursts around 20mb and slow down to under 7mb in few seconds but my usb 3.0 stays around 100mb
 
The only requirement needed for manufacturers to label ports as USB3, is that they're pprts need to be faster than USB2. This means that your ports may not be capable of the maximum usb3 speed is capable of.
 
Shlouski said:
The only requirement needed for manufacturers to label ports as USB3, is that they're pprts need to be faster than USB2. This means that your ports may not be capable of the maximum usb3 speed is capable of.
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Do you have a source for this? There's a USB compliance program where the interfaces have to match the specification.

There aren't many things that can saturate that bus yet, unless you plugged in a SSD or similar. Based on 8b10b encoding you'd see just under 500 MB/sec assuming the device itself could transfer that much.
 
beers said:
Do you have a source for this? There's a USB compliance program where the interfaces have to match the specification.

There aren't many things that can saturate that bus yet, unless you plugged in a SSD or similar. Based on 8b10b encoding you'd see just under 500 MB/sec assuming the device itself could transfer that much.
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I know cables aren't following this specification fully. There has been a huge fallout with USB Type C to USB Type A cables, with some not having the correct resistor meaning the cable can damage chargers by pulling too much current. There doesn't seem to be anything stopping companies from slapping the USB logo on their products even if they are missing certain requirements.
 
beers said:
Do you have a source for this? There's a USB compliance program where the interfaces have to match the specification.

There aren't many things that can saturate that bus yet, unless you plugged in a SSD or similar. Based on 8b10b encoding you'd see just under 500 MB/sec assuming the device itself could transfer that much.
Click to expand...

I was watching a LinusTechTips WAN show where they talked about USB3, they were saying that USB ports only needed to be faster than USB2 ports, then could be called USB3, they and they did bring up sources to prove this, but this would require me to go through hours of video to find. I'm sure the truth is out in the internet somewhere :D.
 
I have the porche design 3tb hard drive which I think uses Seagate hard drives. my mother board is a gigabyte G1 Sniper. still transferring at 40mb/s only
 
johnfallon said:
I have the porche design 3tb hard drive which I think uses Seagate hard drives. my mother board is a gigabyte G1 Sniper. still transferring at 40mb/s only
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Is that a USB 3.0 drive or 2.0? What color is the USB connector? Did you plug them into the USB 3.0 port on your motherboard?
 
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