WEBVTT

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if you own a desktop computer the number of usb ports at your disposal might be

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an embarrassment of riches even mid to low range machines can offer more usb

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than you could possibly know what to do with but is it actually a good idea to

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use them all at once here's the deal you know how the makers of usb products like

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to loudly yell about how blazingly fast they are well it's fairly common

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knowledge in the tech world that those advertised numbers are theoretical

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maximums that you probably won't see in reality and using multiple usb ports at

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once can actually cut into these speeds even further due to a separate effect

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you see your computer's usb ports are

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connected to controller chips inside the system and a single usb controller can

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only handle so much traffic so let's say you have two usb 3 ports on the front of

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your computer connected to a header on the motherboard that utilizes one

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controller you can get the full five gigabits per

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second if you're just plugging one flash drive into those ports but if you're

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using both then those two drives actually have to share that five

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gigabits of bandwidth so if you're moving data on both ports simultaneously

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the theoretical maximum speed per port will be cut in half

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and this isn't just true for front panel inputs oftentimes the ports on the back

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of your pc which don't even use a header cable are susceptible to the same

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problem it just isn't all that common for a port to have its own dedicated

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controller utilized by nothing else but why don't motherboard manufacturers

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just add more controllers then are they cheaping out on us

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so why not one controller per usb port

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well think about how most people use their usb ports you'll have a flash

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drive to transfer data every now and again but your other ports are probably

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being pressed into service for your keyboard mouse headset or novelty

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glitter lamp and none of those things requires very much bandwidth given then

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that the vast majority of users aren't constantly blasting data down multiple

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usb ports at once there just isn't much reason to build a bunch of controllers

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onto a typical motherboard but most systems do have more than one usb

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controller if you go into Windows device manager you'll typically see multiple

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devices that are labeled usb host controller so it's not like you have

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eight or 12 ports that are all sharing one pipe however do keep in mind the

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limits of a single controller if you're doing something heavy like editing video

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and constantly backing up footage or using a vr headset with your pc in fact

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oculus officially recommends connecting no more than two of their sensors to a

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single usb controller due to how much data needs to be processed for a smooth

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vr experience this is not just due to possible bandwidth issues but also due

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to the logic of the controllers themselves becoming overloaded

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and keep in mind that a similar concept applies to the way that usb handles

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electrical power if you're trying to charge or power multiple devices from

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your computer each device won't get the full amount of

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power if many of them are connected to the same internal hub so you could see

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slower operation if you're using an older mechanical external hard drive or

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a couple of those novelty fans to cool you down because you spent all your

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money on a graphics card and didn't have enough left over for an air conditioner

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so if you have a lot of usb devices that you need to use at once think carefully

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about how much data they'll be moving and also do some digging to see how many

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host controllers your computer comes with i know that yes theoretically you

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can connect 127 devices to a single usb

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controller but i wouldn't recommend trying that unless you have a very good

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reason just like i'd recommend subscribing because you have a great reason these

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videos are great get subscribed