A hardware teardown has exposed a $5 AliExpress USB hub as something you genuinely do not want anywhere near your gaming rig, with a power backfeed flaw that could damage your PC's components.
Tech teardown specialist Dr Gough Lui of Dr Gough's Techzone picked up a 7-port "USB 3.0" hub from AliExpress and decided to crack it open after spotting some odd external details. What he found inside is a good reminder that some bargains really aren't bargains at all.
Six ports that aren't what they claim to be
The hub arrived with zero visible manufacturer branding beyond a hard-to-trace company reference on the outer packaging. That alone should set off alarm bells. Prying the plastic chassis open (no screws, naturally) revealed the first problem straight away: 6 of the 7 ports have only 4 pins each, which caps them at USB 2.0 speeds at best. Only the single port at the end of the hub has the correct pin configuration for genuine USB 3.0 operation.
Here's the thing: every port on the hub is colored blue, the universal visual shorthand for USB 3.0. So the hub is actively misleading users about what they're getting. That's before you even get to the soldering quality, which Dr Gough describes as economical to the point of making the ports prone to flexing issues.
The two internal HS8836A controller chips also handle zero power monitoring or port control. The indicator LED? It's just wired in series across the VBUS line. Purely decorative.
The power backfeed problem that makes this genuinely risky
The USB 2.0 deception is annoying. The power circuit design is the part that earns the "mildly dangerous" label.
The hub includes a barrel jack for an external power supply. The problem is how that jack is wired. The external power connection is simply tied directly to the USB bus power line without using the jack's internal switch to isolate the two sources. What that means in practice: if you plug in an external power adapter, it will backfeed voltage directly into your computer through the USB port.
This is not a new or obscure failure mode. Dr Gough notes this exact issue has been a known design problem for over 20 years, yet budget manufacturers are still shipping products with it in place. The capacitors that would normally provide local bypassing and some protection? Skipped entirely to cut costs.
The hub doesn't come bundled with an external power brick, so most buyers will never plug one in and never trigger the fault. But the port is right there, unlabeled, waiting for someone to use a compatible adapter from their parts drawer.
What a $5 saving could actually cost you
Dr Gough's conclusion is blunt: this is a "mildly dangerous device in terms of causing damage to other devices." He also notes the hassle of returning it would likely cost more than the hub itself once cashback and coupon complications are factored in, which is almost certainly by design from the seller's perspective.
The key here is understanding what corners actually get cut when a product hits this price point. Fake USB 3.0 labeling is irritating but survivable. A power circuit that can fry your motherboard's USB controller is a different category of problem entirely.
For gamers who run setups with multiple peripherals, a USB hub is a genuinely useful piece of kit. Controllers, headsets, capture cards, external drives: the ports fill up fast. But the $5 saving versus a reputable brand hub starts looking a lot less attractive when you weigh it against the cost of a motherboard replacement, or the time lost troubleshooting mysterious USB failures.
If you're dealing with PC hardware headaches of a different kind, our PC crash fix guide for 007 First Light walks through GPU-related solutions worth knowing. For more hardware and gaming tips, the full gaming guides library has you covered across a wide range of setups and titles. And if you want to see how we rate peripherals and gear before you buy, check out our latest reviews for tested recommendations.
