why does the fan have two usb ports?
1250573
Because it takes up one of your laptops usb ports and it makes up for that loss.
1250574
one for power and the other one is for a usb to ac adapter. if you dont want to siphon off power from your laptop.
1250575
Presumably so when the first one stops working there is another one available. Unfortunately just after I submitted my earlier review, the first one DID stop working. The second one worked once. I've taken it apart and neither I nor my husband can determine why is has failed. Too bad because it was great while it worked.
1250576
1 port powers the unit and the 2nd you can power up other devices or charge cell phone.
1250577
Because it is taking up one of your on-board USB ports to power it. The fan acts as a small USB hub so that you are gaining one instead if losing one on the computer.
1647311
I've heard the reason for the two USB's is in case you have a computer that doesn't provide enough power on just one USB, then you have to use two. It seems to work fine with just one USB with my Compaq (HP) 6730s laptop. I've also tried in on my HP desktop and it also works with just one USB. My thoughts are, try it with one and if it works, great! If not, then you'll have to use two.
614716
the answer if not already answered is it has holes for both in it for multiple fan options
1644810
You power the fan by putting the usb cable to your computer which will power it; but it also has a pass through so you can plug in another usb device on top of it.
619730
It doesn't have a USB, you can only connect it to the fan header in to the motherboard!!!
1331294
The fan only needs to be plugged in to a USB to run at full speed. In order to use the USB plugs at the base of the fan you have to buy additional power adapter.
63641
"Plug in (a quantity of) 4 USB fans?" Why would I do that? No, just one fan. Perhaps I misunderstand the question or you're implying someone's an idiot.
2111981
i can power my fan off a USB port in my laptop. I see the fan as being a nice extra, but is it really needed? How hot does your Mac get without it?
506708
No the USB adapter is only for the 4 USB ports and having the lights on when it is not plugged into a wall the fans are off
1416002
It has the second USB connector if additional power is needed but I am running it using just the main USB connector plugged in....No issues to speak of.
1560491
No, there's 3 ports, two of them are 2.0 and the one is 3.0, I've had this case for a little over two years and I love it, my pc is always cool and maybe the only flaw if you want to look at it that way is to get to the front filters of the fans you do need to unscrew a lot of bolts in the front part, I mean is really easy but a little tedious if you know what I mean. Just my two cents.
1764498
Mostly the number of fans. but also the clock speed is imperceptibly faster on the one with two fans. I own the one with two fans and it works well.
3977
Yes, one is for data and the other is for power. Sometimes a USB port won't supply enough power through one port. I have used an adapter that just had one USB. This one does require the use of both.
555218
It has 2 external USB ports; however 1 is being utilized with the included keyboard.
1321018
There is a cable in the package that is USB 2.0 on one end and a mini-USB on the other. The mini USB end plugs into the top right hand socket as you are facing the ErgoStand - the USB 2.0 end plugs into any USB port on your computer. The fan is powered by the computer and is on when your computer is on.
8081
Yes allows two fans to be plugged into one outlet on the motherboard. Mine works great, runs both fans on my water cooler.
545922
There is only one fan in the case in the back and places for more. However based on how the case is set up, it would be difficult to actually add those fans. The wiring is there for everything, however the advertised USB on front is basically a pass through to hook into the back.