Home > The Machina Library > Mini-PCI vs. PCI Express Mini - A Guide to Internal Laptop Wireless Cards

This is just a brief overview of the differences between the two major types of internal wireless (WLAN) adapters found in modern laptops. We won't get into details like different chipsets or connection speeds, just the physical differences in form factor.

The Short:
Older laptops use Mini-PCI, and newer laptops use PCI Express Mini, also known as Mini-PCI Express or Mini-PCI-e.

How Old is Old?
Mini-PCI can be found on pretty much all laptops with built-in wireless networking made before 2005. Many computers that are now too outdated to have included built-in wireless at the time of purchase may still have a Mini-PCI slot, but this was used for 56K modem cards. Laptops produced after 2005 start to begin using PCI Express Mini. Today in 2008, arguably all new laptops make use of PCI Express Mini.

Show Me the Difference
It's no surprise that the older cards are larger than the new ones. Below is pictured an older Mini-PCI wireless adapter. It has 124 pin edge connection and an overall square shape.

Next we have pictured a newer PCI Express Mini card. It has a 54 pin edge connection, and a rectangular shape.

How Do I Know For Sure Which One I Need?
For starters, we've identified the correct type of card for thousands of laptop models within our database, so the easiest way is to browse parts for your laptop model by clicking your brand at the left. If we don't have your model listed, you can look around the web for the answer, or do a visual check in your laptop.

Where Do I Install or Replace the Card?
We recommend first visually checking where your card is located, for several reasons. Most laptops have the card easily accessible from under a cover panel on the base of the laptop. However, there are a few models that require removing the keyboard or some disassembly to get at the card. Second, you should verify that wireless antenna cables are hooked up to your existing card, or are dangling near where the card belongs. Some older models that were not purchased with wireless networking capabilities would need new antenna cables to be retrofitted inside the computer.