You probably don't know what every cable does for your computer, and with new ones coming up all the time, it's hard to keep track of what you really need. So the guys at Gamers Nexus came up with this video to educate normal geeks like us on three misleading cables that aren't what they seem.

These cables include:

HDMI to VGA Cables: These cables on their own won't do anything. You'd need something to convert the signal from analog to digital (or vice-versa), which the cable itself cannot do.

"Fake" Dual-Link DVI Cables: Dual-link DVI is real, but some cables may actually have dual-link headers without actually supporting the dual-link standard. Real dual-link cables will be thicker and a bit more expensive, so make sure you're buying the right thing.

SATA II and SATA III (6 GB/s) Cables: With the exception of a clip that secures the cable, there is no difference between SATA II and SATA III cables. The only thing that matters is whether your hard drive and motherboard are both SATA III compatible—you can use an old SATA II cable between the two and still get SATA III speeds. The rest is just branding.

Watch the video below for a full lesson: