What Is the Difference Between Half-Length and Full-Length PCI Slots?

Updated Sep 12, 2018

Reported In


  • PCI-5122

Issue Details

I am looking for a computer that will accommodate a full-length PCI card, what specification do I need to keep in mind to ensure it will fit properly?


There are three different kinds of PCI cards: Full-Length, Half-Length, and another type called Low-Profile or Slim.

The bus connection is identical for all three types of cards, but most computers will only accommodate half-length PCI cards. You will need to check with the computer manufacturer or take a look at the machine specifications to verify what PCI size your computer can accommodate. The measurements of each PCI format are listed in the table below.

PCI TypeDimenstions (mm)Dimensions (in)
Full-Length107 mm (height) X 312 mm (length)4.21 in (height) X 12.28 in (length)
Half-Length106.68 mm (height) X 175.26mm (length)4.2 in (height) X 6.9 in (length)
Low-Profile / Slim64.41mm (height) X 119.91mm (length) to 64.41mm (height) X 167.64mm (length)2.54 in (height) X 4.72 in (length) to 2.54 in (height) X 6.59 in (length)

See the related links section for more information on low-profile/slim PCI cards.


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